1178 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Family MALDANM. 
Genus PRAXILLA Malmgren. 
Praxilla sp. ? 
From station 3935, at a depth of 35 fathoms, on bottom of white sand, shells, and corallines, were 
dredged two fragments of the anterior ends of individuals of this genus. In the form of the hooked 
setae these resemble Praxilla kerguelensis of McIntosh (Challenger Report, vol. xn, p. 405). They lack, 
however, the anterior collar fold on somites 2 and 3. Tube mainly composed of radiolaria. 
Family SABELLM. 
Genus POTAMILLA Malmgren. 
Potamilla torelli Malmgren. 
Potamilla torelli Malmgren, Nordiska Hafs Annulatar, p. 402, 1865; Ann. PolycAaeta, p. 114, Taf. xm, fig. 76, 1865; 
McIntosh, Report Challenger Expedition, vol. xn, p. 484, pi. liii, fig. 2, pi. xxix A, figs. 16-19. 
McIntosh does not mention paired eyes, which appear on most branchial just behind the tip. 
They are usually very small, but one specimen showed two branchiae with very prominent eyes, 
appearing as large, dark-brown, spherical bodies, just behind the apex of the tentacle. The bottle con- 
taining the specimen had also a tube, formed of a membranous basis, thickly covered with fragments 
of shells. It probably belongs with this annelid, though it seemed small for the animal accompany- 
ing it. 
Collected in Honolulu harbor. 
Potamilla elongata, new species. 
A number of tubes, 2 mm. in diameter, containing fragments of the animals. Body very long 
and slender. Gills 20 mm. long, not more than 2 mm. in diameter ( when rolled together, as in pre- 
served specimen). 
Fig. 73. Fig. 74. Fig. 75. 
Potamilla elongata, new species. (73) Seta, x 280. (74) Seta, x 183. (75) Uncinus, x 250. 
Thoracic setse of two kinds, one (fig. 73) long, slender, broader at the end, with a terminal acute 
tip; the other (fig. 74) with shaft about equal to that of former in diameter, tapering to blunt tip, 
with a rounded “wing” on opposite sides of apex, uniting beyond apex and terminating in an 
acute tip. 
TJncini with one large tooth, and crown covered with a number of smaller teeth (fig. 75). 
Collected at station 3865, 256 fathoms, on bottom of fine volcanic sand, and .from station 3883, 
277 fathoms, on bottom of globigerina ooze. 
Type no. 5221, U. S. National Museum, collected at station 3883. 
Potamilla californica, new species. 
A single individual, retaining only head, thorax, and a few abdominal somites. Branchise 20 in 
number, 6-8 mm. long, with very delicate side branches. Basal portion broadest in collar region, nar- 
rowing slightly near where gills are attached. Collar very narrow, with incisions above and below, 
with ventrally a dark transverse band on either side. 
Number of thoracic somites, 8. Setse and uncini like those of P. elongata. It differs from the latter 
species in the greater body diameter and the much shorter branchise. 
Collected at station 4551, vicinity of Monterey Bay, California. Type no. 5222, U. S. National 
Museum. 
