16 Journal of Entomology and Zoology 
dorsal lobe similar in form to that in armiger. Caudal end of all the types missing. 
Greatest width, 2 mm. 
Type—M. C. Z. 2, 162. 
Balboa (Sept. 10, 1917). 
FLABELLIGERID © 
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 sur- 
face 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 sete 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 
if 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 cury- 
ing mesad. ‘The entire surface is densely papillose. The sete of the collar are 
cloaked by a dense growth of long filiform papille with large clavate tips, these 
papille approximating the sete in length. The papille also cluster densely about the 
notopodia, these papille having similar clavate tips. The papille of the general sur- 
face 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. 
CAPITELLID-® 
-  Natomastus angulatus sp. nov. 
In comparison with N. tenuis Moore, known from San Diego, this species differs 
in the form of the thorax, which is strongly angulate instead of terete the sides and 
venter being flat and the dorsum usually but little convex, so that the cross-section is 
nearly quadrate; also in having the segments and their subdivisions sharply separated 
with the posterior subsegment in each case much shorter than the anterior instead 
of equal to it. In the type the posterior thoracic somites are twice or more as long as 
wide, but in some paratypes the relative length is much less. Thorax narrowed caudad. 
The abdomen in its anterior part obviously thicker than the thorax in its widest part. 
The prostomium characteristic, showing two distinct regions, a broad posterior one 
with convex, anteriorly converging sides and a narrower, subconical, palpoidal ter- 
