20 University of California Publications in Zoology [VoL 28 
Characters.—Rostrum nearly oblong-triangular, with a distinct upward trend, 
tip acute. Anterior margin of carapace below the rostrum strongly convex and 
protruding; supraocular and hepatie spines well developed; gastro-hepatic groove 
distinct. Corneae large, broader than deep, scarcely as long as broad. First joint 
of antennular peduncle considerably longer than the third, outer margin as long 
as the same margin of the two distal joints together; second joint rather slender 
and scarcely longer than the slender third joint. Antennal scale moderately broad 
at the end, with spine projecting beyond the terminal margin. Third maxillipeds 
scarcely longer than the third legs. Sixth segment of abdomen twice as long as 
deep; about as long as, or slightly longer than fourth and fifth together. 
Dimensions.—Type: length 54 mm.; of largest specimen measured by Miss 
Rathbun 52 mm.; average about 40 mm. 
Type Locality—Off Japan, 345 fathoms (‘‘Challenger’’ station 232, lat. 35°: 
11’ N, long. 139° 28’ E). 
Distribution—Also taken by the ‘‘Albatross’’ from off Destruction Island, 
Washington, to the Gulf of California, northwest of Tiburon Island, 145 to 2228 
fathoms. The depth for one station (4468) in Monterey Bay is recorded as 
51-309-32 fathoms. 
Sergestes sp. indet. 
Sergestes sp. indet., Rathbun, H. A. E., 10, 146, 1904. 
‘A single mutilated female Sergestes, without maxillipeds or trunk-legs, was 
dredged by the ‘ Albatross’ in 417 fathoms off San Diego, California, station 2928. 
It resembles S. mollis Smith [Rept. U. S. Commissioner Fisheries for 1882, pp. 
419-421]. Body stout; length about 38 mm. The rostrum and anterior outline 
are as in that species. There is a minute hepatic spine. A strong ridge runs 
from the anterior margin at the outer edge of the eye-stalk backward to the 
posterior margin; the front part of the ridge is higher up than in S. mollis; at its 
middle the ridge gives off a weaker branch directed obliquely downward and 
backward, and then backward to the posterior margin. Gastro-cardiac groove 
deep; cervical groove present. Eyes a little shorter than in S. mollis, reaching 
24 the length of the first antennular segment; cornea brown. Antennular peduncle 
rather stout, first joint the longest, 124 times the second joint; second and third 
subequal; notch in outer side of first segment very slight. Antennal scales broken 
off. Abdomen as in S. mollis. Telson broken off. No hairs visible on outer 
margin of outer uropod.’’ (Rathbun.) 
Family PENEIDAE 
Rostrum usually well developed, sometimes short and elevated, laterally com- 
pressed, often toothed. Antennules with two flagella; basal joint of peduncle 
dorsally concave for the eye, and strengthened at the base, on outer side, by a 
spine-like scale. Mandibles with incisor process, and palp of one or two segments. 
First three pairs of legs similar, chelate, and slender, increasing in-length from 
before backward; remaining two pairs well developed, simple. 
KEY To THE CALIFORNIA GENERA OF THE PENEIDAE 
I. Rostrum toothed above and below. Inner border of first segment of antennular 
peduncle with a twisted setose scale. (Not known north of San Francisco 
Bay. 
fe Peneus, p. 21. 
