78 University of California Publications in Zoology \yoh. 23 



Characters. — Rostrum a little longer than lateral spines, reaching extremity 

 of basal joint of antennules. Second joint of antennules slightly longer than 

 third; first joint only about one: and a-half times longer than second; basal spine 

 reaching at least to middle of the second joint, usually attaining its distal third. 

 Lateral spine of basal joint of antennae about as long or slightly longer than the 

 rostrum; spine of antennal scale about as long as or slightly longer than terminal 

 joint of antennal peduncle. Anterior margin of palm of large chela terminates 

 in a conical tubercle, which is short and always destitute of a spine. Carpus of 

 second pair of legs with first segment slightly shorter than sum of next four; 

 merus shorter than the carpus. Merus of third pair of legs approximately equal 

 to carpus of second pair and about three and three-quarters to four times as 

 wide; dorsal hook of dactyl about twice as long as ventral. Telson with posterior 

 angles right angles not prolonged into a triangular prominence. 



Dimensions. — Type, largest female: length 30 mm., carapace 10 mm., larger 

 hand 11 mm. Of largest specimen examined by Coutiere: length of carapace and 

 rostral spine 7 mm., of rostral spine about 1 mm., of abdomen 10.2 mm. 



Type Locality. — Gulf of California. 



Distribution. — Also taken off eastern point of San Nicolas Island, California, 

 229 to 298 fathoms ("Albatross" station 4421) (Coutiere) ; from Venice Beach, 

 Santa Monica Bay, in roots of Neriocystis, and west shore of Catalina Harbor, 

 littoral, received from Venice Marine Biological Station. 



Bernards. — In introducing his description, from which the above characters 

 have been drawn in part, Coutiere says: 



I believe I have rediscovered the species described by Lockington, although the 

 specimens which represent it differ in slight details. . . . The description of Lock- 

 ington — very explicit as to the length of the antennal spines, the form of the 

 chela of the first pair, the carpus of the second pair, the dactyl of the third pair, 

 and the telson — appears to permit identification of the specimens of S. leviusculus 

 with those which I have studied. The differences bear upon two points: Locking- 

 ton says the spine of the scaphocerite [antennal scale] does not reach the extrem- 

 ity of the peduncle and that the movable finger of the large chela projects beyond 

 the pollex. The first character hardly exists on the specimens I have seen, the 

 spine being approximately equal to the carpocerite [the terminal joint of the 

 antennal peduncle] and the fingers of the large chela equal. 



In turn, the specimens received from the Venice Marine Biological Station 

 which I assign to this species differ slightly from Coutiere 's figures and descrip- 

 tions, but his figures differ in a few minor points from the specimens on which 

 they were based. The slender dactyl of the larger chela as figured by him is 

 not so apparent in his specimens. In them the outline approximates more nearly 

 the one figured above; in it, however, the palm is somewhat stouter. Further, the 

 inferodistal angle of the propodus of the third pair of legs bears a pair of juxta- 

 posed spines, both in his specimens and ours, while his figures show but one; simi- 

 larly, the inferodistal angle of the carpus of the same pair of legs which he figured 

 as unarmed carries a spine in both lots of specimens. The second legs, on the other 

 hand, are in very close agreement. In general the Venice specimens are propor- 

 tionally somewhat stouter throughout, but structurally they are so nearly like 

 Coutiere 's that in spite of the great discrepancy in the depths at which they were 

 obtained I feel convinced that they represent the same species (cf. Crago varia- 

 bilis, Memories, p. 99). 



