165 
First segment of pleon with a triangular spine, behind which a low 
central carina is continued to the extremity of the sixth segment of 
the pleon, rising into a spine on the posterior margin of the fifth and 
sixth segments. f 
Opthalmic peduncle shorter than the basal joint of antennule, cor- 
nea large, broader than the peduncle, its width about equal to the 
length of the visible portion of the latter. 
Basal joint of antennular peduncle broad, armed with two sharp 
lateral spines, one behind the other, in a line with the lateral spines of 
the carapax; flagella of antennule scarcely as long as the two distal 
joints of the peduncle, the joints much shorter than broad. 
Spine of antennal scale extending slightly beyond the antennular 
peduncle, the squamose portion broad, not longer than the spinose 
portion. 
Peduncle of antenne slightly shorter than that of antennuls, its 
terminal joint setose on its internal margin, flagellum much shorter 
than the body, its articulations broader than long, especially the prox- 
imal portion, where they are depressed and margined with seta inter- 
nally and externally. 
Outer maxillepeds extending beyond antennal peduncle, the propo- 
dus margined internally with long setz. 
Meros, carpus and propodus of first pair of legs equal in length, all 
the joints of second pair longer, but the carpus longer than the meros; 
in the third pair, which extends beyond the outer maxillipeds when 
straightened, all the joints are longer than in the second pair, and 
the slender carpus almost twice the length of the propodus. 
Propodi of three first pairs similar, that of the third pair somewhat 
longest, fingers parallel, equal to the palmer portion in the first and 
second pairs, but shorter in the third. 
Fifth pair longer than the fourth, dactyli laminate. 
A spine at the tip of the outer caudal appendage externally. 
Length of a large specimen, : c - : «, oar 
Length of carapax, : c 4 : : ‘ = 0:35! 
Length of outerantenne, . 5 4 c p el Bbit 
Dredged from a depth of 14 fathoms, in Bolinas Bay, Lower Cali- 
fornia; also obtained in Angeles Bay, Gulf of California. (W. J. 
Fisher.) 
Color after two weeks exposure to alcohol, bright red; with a dark 
red-brown ocellated spot on each side of the carapax. Antenne blu- 
ish. ; 
A longer exposure to alcohol has bleached the body, but the anten- 
nx still show traces of blue, and the spots on the carapax, though 
obsolete in one specimen, remain dark and conspicuous in another. 
This form resembles S. carinata Dana (U. S. Ex. Exp. Crust., I, p. 
602), but the rostrum is more prominent. 
[Printed at the SALEM PRESS, March, 1879.] 
