_Hesperophyllum_ gen. nov.
Similar in general to _Notophyllum_ and _Austrophyllum_ but differing
especially in having the ventral cirrus of the second segment flattened
and foliaceous and strongly asymmetrical. It is like _Notophyllum_ and
unlike _Austrophyllum_ in having the first segment dorsally reduced.
_Genotype._--_H. tectum_ sp. nov.
_Hesperophyllum tectum_ sp. nov.
The first segment dorsally reduced. Ventral tentacular cirrus of second
somite of a thin or foliaceous and asymmetrical form. Other tentacular
cirri subcylindric, reduced distally to a pointed tip, that of I about
half as long as the dorsals of II and III. Paired tentacles short,
proximally thick and convexly bulging, abruptly narrowed to an acute
tip with incurving sides. Unpaired tentacle situated between eyes in
line connecting their centers, nearly of same length and size as the
first tentacular cirri and about as long also as prostomium; annulate.
Prostomium shortly subcordate, well rounded in front, incurved
caudally. With very large cirri of which the dorsals widely overlap
in the middle and thus completely cover the dorsum, the prostomium
normally also being wholly concealed from above. The neurocirrus of
a typical parapodium is attached by a broad base extending from a
pronounced ventral swelling or flange (neurocirrophore) across the
caudal side of the parapodium to its dorsal edge and projects farther
dorsad of the parapodium than ventrad, the dorsomesal end widely
rounded; much broader dorsoventrally than long, with the free edge
evenly rounded. The notocirrophore in a thick rounded body arising
from the base of the parapodium proper and showing the notopodium as
a proportionately much smaller lobe on its ectal side; the style is
attached about its caudal half-circumference and is broadly subreniform
with the free margin coarsely crenulate or wavy, its mesal limb
widely overlapping that of the opposite notocirrus and its ectal
one overlapping the neurocirrus. Surface of cirri and of somites,
especially ventrally, densely covered with very fine brown dots or
points. Number of segments in type, near seventy-three. Body narrowing
caudad, becoming narrow and pointed at posterior end. Proboscis unknown.
Length, 19 mm.
Type--M. C. Z. 2, 143.
Dredged. Brown in life, this color being also retained in the preserved
type specimen. A paratype has a greenish cast. This species suggests
_Notophyllum imbricatum_ Moore in the large imbricated notocirri
covering the dorsum but in the latter all the tentacular cirri are of
the elongate, symmetrical, evenly tapering form characteristic of its
genus. _Imbricatum_ similarly presents nuchal appendages, but these
are three in number on each side and slender, instead of two broad,
subelliptic lobes. The neuropodium is distally narrowed instead of
broad, the head is differently formed, and various other differences
are present throughout.
_Steggoa gracilior_ sp. nov.
This is a small and slender form noted as green in life and also
retaining this color after preservation in alcohol. It agrees in
general with _Steggoa_, the first segment being normally developed
above and distinct from the prostomium though not so clearly separated
as usual, suggesting a tendency toward the _Hypoeulalia_ condition.
Prostomium a little longer than wide, narrowed anteriorly, sides
convex; a short lobe, rounded in front and bearing the four tentacles,
is set off by a weak constriction from the basal part. Unpaired
tentacle situated well caudad, more slender than the paired ones
but nearly as long. Eyes not detected. Ventral tentacular cirrus of
II of a thick, leaf-shaped form, sublanceolate in outline and much
like the notocirri. The other tentacular cirri longer and filiform.
Notocirri in outline lanceolate, characteristically exceptionally thick
in proportion to width so as at times to appear nearly subconical.
Neurocirri much smaller; similarly proportionately thick and at times
subconical. Body slender, strongly narrowed from the middle toward both
ends. The proboscis densely and uniformly papillose throughout. Number
of segments near one hundred and twenty-three.
Length, about 26 mm.
Type--M. C. Z. 2, 144.
_Sige californiensis_ sp. nov.
Corresponding closely in general characters with _S. macroceros_
(Grube), the genotype. Green in color instead of straw-yellow to
brown. Tentacles long and slender as in _macroceros_, with the median
equalling the others in length and inserted close to the base of the
latter; tips of tentacles slenderly attenuated. The eyes seem to be
proportionately larger than in _macroceros_. The first segment is
reduced above at the sides where the prostomium bulges back on each
side; but the middle region is well developed, extending forward on the
base of the head as a rounded lobe or flap. Very easily distinguished
from _macroceros_ and other known species by the form of the ventral
tentacular cirrus of the second segment which, in place of the
ordinarily lanceolate foliaceous form, is very strongly expanded above
the base, presenting a large rounded lobe in front and an abruptly much
more slender tip, with the blade as a whole irregularly twisted. The
parapodia very similar to those of the genotype; but the setigerous
lobe less acutely and less deeply notched and rather broader across the
end along the setigerous line. The notocirri rather more slender and
narrowed more evenly distally, not incurved on each side distally so as
to leave an elongate tip set off from the rest. The neurocirri similar
but more asymmetrical, the upper margin straight or concave, the lower
convex. Anal cirri missing. Proboscis not protruded. Total number of
segments in the type, which is complete, sixty-eight.
Length, 10 mm.
Type--M. C. Z. 2, 145.
Taken under stones.
Moore has described _Eulalia (Sige) bifoliata_ from Monterey Bay; but
as the ventral tentacular cirrus of II is described and figured as
cylindroconical, that species cannot be properly referred to _Sige_ as
now restricted.
_Anaitides heterocirrus_ sp. nov.
Close to _A. mucosa_ (Oersted) in the characters of the proboscis,
having similarly six rows of papillæ proximally on each side with the
number in each series normally nine or ten, but distinct in the form
of the cirri. The three first pairs of normal foliaceous notocirri
much smaller than the succeeding ones and different in shape, being
very broadly and evenly elliptic, the distal end of the third, e. g.,
broadly rounded, not conspicuously narrowed as in _mucosa_. In the
average parapodia of the middle region of the body the neurocirri
are obviously broader with the tip stouter and less acute; and the
notocirri, while in general somewhat similar in form, are more elongate
with a more pronounced ventral lobe, the distoectal angle more acute
and more produced, while the distomesal corner is more rounded, and the
proportionate width across the distal end appears less. The prostomium
very broadly cordate, notched or constricted at the sides near the
anterior third which is distally broadly rounded; tentacles inserted
on each side at or just distad of the constriction, conical and of
moderate length; caudal margin conspicuously angularly incised at
middle and there embracing a conspicuous nuchal papilla. Eyes about
twice their diameter apart. The type is incomplete caudally, at present
consisting of ninety-five somites and having a length of 35 mm. with a
maximum width, exclusive of parapodia, of 2 mm. The body at present has
a purplish tinge.
Dredged at 10 fathoms on Aug. 27, 1917.
Type--M. C. Z. 2, 146.