Annelids of Alaska—HARTMAN 
37 
The range is hereby extended in the Pacific, 
from Mexico and central California to south¬ 
western Alaska, in 13 to 100 fm. 
Polydora socialis (Schmarda) 
Leucodore socialis Schmarda, 1861: 64, pi. 27, 
fig. 209. 
Polydora socialis Hartman, 1941: 290, 310, pi. 
48, fig. 41, 42. 
Collection. Station L 18-41 (1). 
The single individual is posteriorly incom¬ 
plete. The dorsum is marked with paired dark 
spots. The prostomium is distinctly bifid at its 
anterior end and has four tiny eyespots in 
trapezoidal arrangement. The nuchal ridge ex¬ 
tends back through 11 setigerous segments and 
lacks a median papilla. Dorsal lamellae of the 
first setigerous segment are conspicuous and ex¬ 
ceed in size those farther back. The first segment 
has both notosetae and neurosetae. Branchiae are 
first present from the eighth segment and con¬ 
tinued posteriorly through a long region. 
Originally described from Chile, this species 
las since been reported from southern Cali¬ 
fornia. The present record is far to the north, 
in Kupreanof Strait, 2 miles northwest of Bare 
Island, in 13 to 15 fm. 
Family CHAETOPTERIDAE 
? Chaetopterus sp. 
Collection. Station C 5-41 (empty tubes). 
Several empty tubes, recalling those of the 
cosmopolitan species, Chaetopterus variopedatus 
Renier, come from Icy Straits, east end of 
Pleasant Island, in 7 fm. 
Family CIRRATULIDAE 
Genus ClRRATULUS Lamarck 
Cirratulus cirratus (Muller) 
Lumbricus cirratus Muller, 1776: 214. 
Cirratulus cirratus Fauvel, 1927: 94, fig. 33. 
i 
Cirratulus cingulatus Johnson, 1901: 422-423, 
pi. 14, fig. 145-148; Berkeley, 1942: 197. 
Collections. Stations 61-40 (2); 108-40 (2). 
This species is known from the northern 
Pacific (see synonymy above). The present 
records are from Cold Bay, in 15 to 30 fm., 
and Alitak Bay, shore. 
Genus Tharyx Webster and Benedict 
Tharyx hamatus new species 
Fig. 10, a-e. 
Collection. Station 108-40 (2). 
The larger one measures about 12 mm. long 
for over 100 segments. Both individuals are 
dark slate-colored, but the prostomium and 
tentacles are pale. The body rings are short and 
closely crowded. The prostomium is approxi¬ 
mately equitriangular in shape and somewhat 
depressed conical; it lacks visible eyespots. 
Nuchal organs are present but not conspicuous 
(Fig. 10 a). The peristomium or anterior apo- 
dous region (since it probably consists of three 
coalesced segments) is three to four times as 
long as, and much thicker than, the prostomium. 
The paired palpi are thick; each has a longi¬ 
tudinal groove, and is inserted dorsolaterally so 
that the palpal bases are not quite touching each 
other. 
The lateral tentacles are most numerous in 
the anterior region but continued on some seg¬ 
ments in a posterior region. They originate 
immediately above the notopodial ridge through¬ 
out. Parapodia are reduced to mere ridges. 
Setae in the anterior region are pointed and 
slender; they extend laterally for a distance 
equaling about half the width of the body at 
their origin. Hooks are present in neuropodia 
already before the middle of the body, but in 
notopodia not until thereafter. In the posterior 
fourth of the body the neuropodia are pro¬ 
vided with only hooks, numbering six to eight 
in a single transverse series (Fig. 10 h)\ the 
corresponding notopodia have both pointed 
setae (Fig. 10 e) and similar hooks, alternating 
with one another, together equaling eight to 
