_Typosyllis bella_ sp. nov.
Differing from _armillaris_ (Müller), _alternata_ (Moore) and related
forms in the form and relations of the prostomium and its appendages.
The prostomium is broadest anteriorly, narrowing caudad and rounded
forward a little at middle in front. A characteristic feature is that
the three tentacles are in a transverse line along the anterior edge,
the median being thus inserted far in advance of the posterior eyes. A
median longitudinal furrow extending forward from caudal edge to base
of median tentacle. The anterior eyes much larger than the posterior
and farther apart, each somewhat transversely elliptic and located
far forward at base of lateral tentacle on its ectal side. The median
tentacle about two and a half times longer than the prostomium; in the
type composed of twenty-one articles; only a little narrowing over
the distal region. Lateral tentacles considerably shorter than the
median. Inferior tentacular cirrus about equal in length to the median
tentacle, the upper one much longer and consisting of about thirty-four
articles. Neurocirri slender, subcylindric, somewhat conical distally
or sometimes a little clavate, surpassing end of parapodium. Notocirri
in anterior region alternating in length, the long ones surpassing the
width of the body proper and consisting of about thirty-two articles
while the short ones embrace only near eighteen. Notocirri becoming
shorter and essentially uniform in the posterior region. Appendage of
setae with subapical tooth larger and stouter, more obtuse, than in
_alternata_, making a wider angle with the apical tooth, and always
conspicuous; the serrations proximad of the tooth fine and rather long.
The body is proportionately rather wide and is depressed or flattened,
narrowing in the posterior region but retaining there the depressed
form. Number of segments in the type, near one hundred and forty-five.
General color yellowish; each somite of anterior region crossed
transversely by two fine complete lines of reddish brown color.
Width in anterior region, exclusive of parapodia, about 1.25 mm.;
length near 20 mm.
Type--M. C. Z. 2, 147.
Taken at low tide.
The type is a female turgid with eggs. It is remarkable in presenting
at the same time a well-developed collateral bud from the ventral
surface near the beginning of the posterior third.
_Pionosyllis pigmentata_ sp. nov.
Somewhat resembling _P. elongata_ (Johnson), which also occurs in this
region, but differing in having the dorsum pigmented throughout, being
black or slaty with pale lines between the segments and dividing each
of the latter transversely excepting across the middorsal region. The
pigmentation may sometimes be very dilute. In technical details readily
distinguished from that species, e. g., in the different form of the
appendage of the setae, this being obviously more elongate and erect
and proportionately more slender. Two or more dorsal setae differ in
having shorter, more strongly curved appendages which are wholly smooth
on the concave edge instead of being pubinate to beyond middle as in
the others. Prostomium rather short and broad. Palpi thick the ectal
lobe small as compared with the principal or mesal one; united only at
base. Eyes small, transversely elongate and often curved, the two on
each side close together and sometimes almost fused, with the posterior
one well mesad of but only a little caudad of the anterior one. Median
tentacle situated midway between the two eye groups in a longitudinal
furrow dividing prostomium; composed of eighteen to twenty-three short
articles. Each paired tentacle at corner of prostomium in front of
eye-group of corresponding side; similar in form and size to the median
tentacle. Lower tentacular cirrus about equalling a tentacle in length,
the dorsal longer, both of similar form. First segment extending
forward in a rounded or subtriangular lobe or flap at middle above. The
notocirri attached above bases of parapodia as usual; long, composed of
numerous short segments; much longer than the tentacles, each average
one when laid back along body ordinarily passing over three or three
and a half segments. Neurocirri short, stout, fusiform. Body slender,
narrowed moderately at the ends, elsewhere of nearly uniform width.
Type composed of seventy-three segments.
Length, near 20 mm.
Type--M. C. Z. 2, 148.
Littoral zone.
_Pionosyllis lucida_ sp. nov.
Readily differentiated from _P. elongata_, which it resembles in its
pale, translucent appearance, in having the distal appendage of setae
more typical, being of a decidedly more elongate and erect form which
also differs from that of _pigmentata_. From the latter differing
conspicuously in appearance in lacking all dark pigment. Notocirri
tapering distad, with apical region slender and pointed; long,
exceeding the width of the body and consisting of up to forty-five
articles. Differing from _pigmentata_ in the form of the neurocirri
which are more uniform in diameter, subcylindric rather than fusiform;
normally extending more or less beyond the tip of the parapodium.
Prostomium short. Eyes reddish; those of first pair larger than the
second; second eye on each side almost directly mesad of the first but
only a little caudad of it. The median tentacle farther forward than in
_pigmentata_, well in front of the eyes, its anterior edge being nearly
in line with the caudal margins of the paired tentacles; composed of
twenty-eight or more short articles. Paired tentacles much shorter and
also more slender; composed of about twenty articles. Palpi fused at
base as usual; narrower distally than in _pigmentata_. The types are
incomplete caudally; but the body is evidently slender. One specimen
8 mm. long consists of forty-three segments; and a second, somewhat
thicker one, of nearly the same length consists of thirty-seven. The
width is near 1 mm.
Type--M. C. Z. 2, 180.
_Hesperalia_ gen. nov.
Palpi thick, fused at base only to middle of length. Pharynx straight.
Proboscis unarmed (?). Tentacles three, attenuated, more or less
obviously jointed. Eyes two pairs; large. Tentacular cirri two pairs.
Parapodia uniramous with setae all compound, or in the epitokous phase
with long simple natatory setae in notopodia of middle region of body.
Appendage of compound setate short, bidentate. Neurocirri present,
thick, rounded. Notocirri on side of body above parapodia; filiform;
more or less segmented. A large quadrate membrane or flap projecting
from anterior edge of peristomium forward over caudal region of
prostomium.
_Genotype._--_H. californiensis_ sp. nov.
_Hesperalia californiensis_ sp. nov.
Body rather stout for a syllid, more as in Hesionidae; broadest and
deepest anteriorly, continuously narrowing caudal to the pointed
posterior end. The color of the dorsum is blackish, with pale
transverse lines in the intersegmental furrows and bisecting each
somite which under the lens thus appears double. Parapodia and cirri
typically pale fulvous and the venter either similar or approaching the
dorsum in color. Prostomium very short, sunk in the first body ring
and almost completely overlapped by the quadrate flap from the latter,
this flap extending over the bases of the tentacles in the type. Palpi
stout, presenting two main lobes fused to their apices or nearly so,
and on each of these an ectodistal lobe projecting ventrocephalad,
these distal lobes wholly free from each other. Tentacles appearing
nearly smooth; tapered; the median exceeding the lateral in length.
Eyes large; in type orange colored; the two on each side contiguous or
nearly so; posterior ones nearer together, each beneath edge of the
quadrate peristomial flap, while the anterior ones are in line with
base of median tentacle. Tentacular cirri of same form as tentacles
but longer. Neurocirri thick, short, distally rounded. Natocirri
long, filiform, tapering distad, weakly ringed; showing a tendency to
alternate in height on the sides of the body, the first being notably
farther distad than the second, the third than the second and fourth,
etc. Setae numerous; the appendage short, falcate, with tip simple, but
a slender tooth near middle of curved edge. Segments short, crowded,
near one hundred in number.
Length of type, 21 mm.; greatest width, 2.2 mm.
Type--M. C. Z. 2, 149.
Taken in August, 1914.
_Hesperalia nans_ sp. nov.
The type of this species is in the epitkous phase. The middle region
of the body bears notopodeal fasciæ of long, fine, simple, natatory
setae in addition to the compound neuropodials. The appendage of the
compound setae differs from that of _californiensis_ in having the
accessory tooth farther distad, well beyond the middle of the concave
edge, whereas in the other species it is normally rather proximad of
the middle. In the present species the prostomium is proportionately
larger, less covered by the peristomial flap which does not extend over
the base of the median tentacle. The palpi are not fused so far distad,
being united only at base; they present below on each a large distal
lobe similar to that in the other species. Eyes with prominent lenses;
large; those on each side sub-contiguous. Median tentacle in line with
the centers of the anterior eyes; short and pointed, shorter than the
width of the prostomium. Paired tentacles a little shorter than the
median; each attached in front of the median at a point midway between
the latter and the anterior eye. Tentacular cirri much longer than the
tentacles, attenuated distad, pointed. The notocirri are all similarly
attenuated and run out to a rather fine point. Neurocirri very thick,
conical, each with a black dot near middle. Contrasting with the
preceding species in color in having the dorsum in general light,
fulvous, in part slightly dusky, with a series of dark, blackish,
transverse lines across dorsum, there being four somites between
each two dark lines. The body is narrowed toward both ends; venter
flat and dorsum strongly arched; hesioniform. Because of the broken
condition of the type the number of segments is uncertain, but is near
seventy-five.
Greatest width, exclusive of parapodia, 1.5 mm.
Type--M. C. Z. 2, 150.
Dredged August 27, 1917.
_Campesyllis_ gen. nov.
Like _Streptosyllis_ in having the pharynx strongly sinuous and unarmed
and in lacking nuchal flaps such as characterize _Amblyosyllis_. It
differs from the former genus in having only composite setae and in
having these of the ordinary structure, the appendage of a simple,
fringed form not covered by a membrane. Eyes two pairs instead of
three. Tentacular cirri two pairs. These, as also the tentacles and
notocirri, short, articulated. Neurocirri attached proximally.
_Genotype._--_C. minor_ sp. nov.
_Campesyllis minor_ sp. nov.
The type of this small form is only 2.5 mm. long. The pharynx is
strongly sinuous. The palpi are contiguous throughout and are fused for
most of length though a median furrow or sulcus above and one below run
to base; projecting forward; together they narrow distad, with outline
triangular; shorter than prostomium. Eyes two pairs, well separated,
subequal, forming a nearly straight transverse row a little in front of
the peristomium. Median tentacle attached far back between posterior
eyes; short, a little exceeding prostomium and palpi together. Lateral
tentacles also short, each attached at cephaloectal corner with the
prostomium bulging forward between them. Tentacular cirri and notocirri
also short, the latter in anterior region about equalling half the
width of the body proper and not extending much beyond the tips of
the setae; joints short, near fifteen or less in number. Neurocirri
subcylindric, slender, reaching ends of parapodia. Setae transparent;
end of shaft but little enlarged, its articular edge very oblique;
appendage long and slender, the tip curved, the edge strongly fringed.
Body ventrally flat, convex dorsally, strongly narrowed caudad.
Taken in a sabellid colony.
Type--M. C. Z. 2, 151.