162 CALIFORNIA ACADEMY OF SCIENCES. 



San Diego! Santa Barbara Island! Santa Catalina Is.! 

 San Quentin Bay, Lower California (Lockington). 



It is remarkable that a species which resembles cali- 

 fomiensis in almost all other respects should differ from 

 it so markedly in the chelipeds of the adult male. The 

 females are very much alike, but they can be distin- 

 guished by the differences in the rostrum and the rela- 

 tive stoutness of the smaller chelipeds. 



Callianassa gigas Dana. 



Callianassa gigas Dana, Proc. Acad. Nat. Sci. Phila., 1852, p. 19; Crust. 

 U. S. Expl. Expd., Part I, 1852, p. 512, Pi. XXXII, fig. 3. Stimpson, 

 Journ. Bost. Soc. Nat. Hist., Vol. VI, 1857, p. 489, PI. XXI, fig. .3. 

 A. Milne-Edwards, Nouv. Arch. Hist. Nat. Paris, Tome VI, 1870, 

 p. 81. Lockington, Ann. Nat. Hist. (5), Vol. II, 1878, p. 302. 



Front more or less triangular. Large hand strongly compressed and 

 smooth; fingers similar, shorter than one-half the length of the hand and 

 not gaping, the dactyl arcuate, acute; carpus more than one-half the 

 length of the hand; merus narrow, toothed below at the base. Telson but 

 little shorter than the uropods. 



Length 4^ inches. 



Puget Sound (Dana). 



Callianassa affinis, sp. nov. 

 PJ,.rt, f^9~-3o 



Male: Front obscurely tridentate. Ocular peduncles oblong, subacute, 

 the inner margins not diverging toward the tip; cornea in front of the 

 middle of the peduncle. Antennulary flagella subequal. Antennae about 

 one-half the length of the body. Ischium of the larger cheiiped dentate 

 below; merus stout, with a prominent lobe on the under side near the 

 base, the lower side of which is denticulated; carpus short, with the pos- 

 tero-inferior angle broadly rounded and the margin not produced as it is 

 in calif orniensis; hand fully twice the length of the carpus; palm oblong, 

 both inner and outer faces convex; dactyl longer than the poUex, the 

 extremity hooked and the inner margin furnished with a few stout teeth. 

 Smaller cheiiped slender; merus widest at the middle; carpus narrow, as 

 long as the hand; fingers pubescent. First pair of ambulatory legs cili- 

 ated below. Telson broadly rounded and shorter than the uropods. 



Point Loma, Calif.! San Clemente Is.! July, 1895. 

 Collection University of California. 



