NO. 1272. NEW DECAPOD CR USTA CEANS—RA THE UN. 887 
CALASTACUS QUINQUESERIATUS. 
Allied to C. fellx Alcock and Anderson. 
Carapace and rostrum as long as first five abdominal somites; surface 
pitted and setose. Rostrum reaches end of second antennular segment, 
is tipped with a spine, side margins armed with three to seven spines, 
and prolonged two-thirds the length of gastric region, where they bear 
five or six spines; these prolongations form a horseshoe. Median 
carina with from two to six spines. Intermediate carina with from 
three to five spines. Eyes colorless, globular. Stylocerite reaching 
to distal third of penult joint of peduncle; scaphocerite not reaching 
middle of stylocerite. Chelipeds unequal, the longer one in the male 
nearly as long as the ho^y. Outer surface of carpus and hand covered 
with sharp granules or short spines; upper margin spinous, also lower 
inner margin of merus; lower outer margin of merus spinous; lower 
margin of propodus granulous. Margins of propodus subparallel, 
fingers shorter than palm in adult males, usually slightly gaping at 
base. 
Abdomen almost smooth, sides setose. Anterior margin of pleura 
of third, fourth, and fifth somites, and lower margin of sixth, armed 
with a small spine. Telson subquadrangular, broadly rounded behind, 
having a few lateral and one median marginal spine, and two larger 
dorsal spines. 
Dlinenmons. — Male, length of carapace and rostrum 28 mm., of 
abdomen 41 mm. 
Type locality. — San Luis Obispo Bay, California, 200 fathoms, sta- 
tion 3196, U. S. Fish Commission steamer JdhatToss (Cat. No. 25240). 
Dlstrihution. — Also taken at six other stations on the coast of 
southern California, in 160 to 38S fathoms. 
Family PEN^ID^. 
GENNADAS BOREALIS. 
Allied to G. parvus Bate. Rostrum longer, reaching at least half 
way along the eyestalk, sometimes to the cornea; armed with one 
tooth. Median carina very distinct nearly to posterior border of 
carapace. A sharp marginal spine at angle of antero-lateral sinus. 
The antennal scale projects beyond the antennular peduncle by about 
the length of the last segment of the peduncle. Chelas of first pair of 
feet narrow and elongate as in the succeeding pairs. Sixth abdominal 
somite more than twice as long as fifth, carinate. A small lateral 
spine at the posterior fourth of the telson. The thelycum differs from 
that of G. parvuH in having the transverse plate between the feet of 
the fourth pair subquadrilateral, narrow in front, and that between 
the fifth pair fan-shaped, narrow behind, anteriorly rounded, and with 
