_Flabelligera haerens_ sp. nov.
This species resembles _F. commensalis_ Moore in the approximation of
the neuropodia though these are apparently not so close as in that
species and are at no place actually contiguous though nearly so in
the extreme caudal region. In front of this they remain a uniform
distance apart, which is less than the length of a somite, forward to
about the tenth somite from where the rows diverge gradually forward.
The notopodia more widely separated, the rows diverging cephalad from
near the tenth somite, always much closer to each other than to the
neuropodia. Ventral surface flattened or weakly concave, the dorsal
surface also flattened but slightly convex, while the sides are
convex; the body in part is slightly compressed from side to side, in
cross-section subquadrate to subcircular; widest in middle region and
narrowing both ways, more strongly so caudad, subfusiform. Collar lobe
deeply and widely incised dorsally and ventrally; the lobe on each
side bearing a series of numerous long cross-striated setæ which are
reddish brown in color and are stouter than the ordinary notopodials.
The notopodials are simple, finely tapered, colorless setae. There is a
single seta in each neuropodium, this being in the form of a very stout
hook; the color is dark throughout; the transverse terminal portion of
the hook is longer and more slender and acute than in commensalis and
the pseudo-joint is farther proximad of the curved region; the shaft is
bent caudad at the level of the joint, the hook proper curving mesad.
The entire surface is densely papillose. The setæ of the collar are
cloaked by a dense growth of long filiform papillæ; with large clavate
tips, these papillæ approximating the setæ in length. The papillæ also
cluster densely about the notopodia, these papillæ having similar
clavate tips. The papillæ of the general surface of dorsum, venter and
sides are much shorter. Color nearly uniform greyish brown. Number of
segments in type, forty-nine.
Length, 13 mm.
Type--M. C. Z. 2, 163.
Taken in holdfasts of kelp, August 12, 1917.