I 921 ] Schmitt: The Marine Decapod Crustacea of California 77 



Characters. — Front trispinose; rostrum present and orbital hoods each armed 

 with a spine; no sulcus between eye-shields and rostrum. Hands oblong, narrow, 

 compressed, smooth, without spines; a transverse sulcus crossing the upper edge 

 of the hand behind the dactyl, from which a longitudinal sulcus extends backward 

 on the upper edge of the larger hand almost to the posterior margin, but about 

 two-thirds as far in the smaller one; dactyl of large hand closing vertically. Basal 

 spine of the antennules stout, extending to end of second joint of peduncle. 

 Carpus of second pair of legs with first segment as long as the next four com- 

 bined. 



Dimensions. — Type, length 19.1 mm. 



Type Locality. — Monterey, California. 



Distribution. — Monterey to Santa Barbara, California. 



Bemarks. — According to Coutiere this is Alpheopsis trispinosus of Stimpson 

 (Eathbun). 



Genus Synalpheus Bate 



Bostrum short and usually spiniform. Antennules with basal joint longest; 

 basal spine wide, equal to sum of first two joints. Distal joint of third maxilli- 

 peds elongate, armed with strong spinules at tip. Carapace with a pterygostomian 

 spine. Thoracic legs without epipodites; dactyli bifid. 



Synalpheus lockingtoni Coutiere 

 Plate 12, figure 1 



Alpheus leviusculus Lockington, Ann. Mag. Nat. Hist. (5), 1, 479, 1878, 



not A. edwardsi var. leviusculus Dana, 1852. 

 Alpheus lockingtoni Coutiere, Proc. U. S. Nat. Mus., 36, 21, fig. 1, 1909. 



Fig. 54. Synalpheus loclcingtoni ; a, third leg, X about 10; b, end of telson, 

 X about 10; c, large chela, X about 7%; d, frontal margin and right side of 

 antenna! region, X about 10. 



