424 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Prostomium expanded into a large velum (Fig. 151) with 33 fim¬ 
briae on edge. 
Peristomium with a pair of subulate, moniliform cirri and numer¬ 
ous club-shaped tentacles (much contracted in preserved specimens). 
Paleolae short, stout, arranged in two distinct groups, 10-12 in each ; 
highly iridescent, either blunt or acutely pointed (lateral ones), 
strongly sloped towards ventral aspect. Second somite with a pair 
of cirri in all respects like the peristomial. 
Branchiae p'ectinate, borne on third and fourth somites. 
Setae broadly limbed and twisted near tip (Fig. 152) with serra¬ 
tions beyond the twist, or straight and without serrations (Fig. 153) . 
The latter are not so numerous. They diminish in size towards 
anterior and posterior extremities of thorax. Uncini with 4 teeth 
(Fig. 154) or occasionally five (Fig. 155); the latter begin about 
the 11th somite; none were found in front of this. Spines on 
scapha (Fig. 156) with a stout, laterally-bent hook at tip. 
Tube composed of coarse sand-grains, curved. 
Length of largest specimen, 28 mm.; diameter of disc, 5 mm. 
Several specimens were dredged by the Columbia University 
Expedition at a depth of 10 fathoms. 
This species comes nearest to P. ( Cistenides) gramdata 
(Malmgren), which has been found in Bering Sea (Marenzeller, 
’90), and was collected at Kadiak by Mr. Cloudsley Rutter, differ¬ 
ing from it only in the shortness of the paleolae and in the form of 
the setae and uncini. Upon examination of more abundant ma¬ 
terial, this form may prove to be identical with gramdata , which is a 
wide-ranging, circumboreal species, and may therefore prove to be 
variable. While the uncini afford, on the whole, the surest diagnos¬ 
tic characters, they should be used with caution, as their variability 
in the present species clearly indicates. 
Ampharetidae. 
42. Sabellides anops sp. nov. PI. 15, figs. 157-161. PI. 
16, figs. 162-163. 
Form stout, curved, thickest about midway of thorax, abdomen 
rather rapidly tapered, convex on dorsal, liat on ventral aspect 
(Fig. 157). Thirty to thirty-one somites, sixteen in thorax, four¬ 
teen to fifteen in abdomen; fourteen setigerous somites in thorax; 
