1921] Schmitt: The Marine Decapod Crustacea of California ith 
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. 
Remarks.—According to Coutiére this is Alpheopsis trispinosus of Stimpson 
(Rathbun). 
Genus Synalpheus Bate 
Rostrum 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 Coutiére 
Plate 12, figure 1 
Alpheus leviusculus Lockington, Ann. Mag. Nat. Hist. (5), 1, 479, 1878, 
not A. edwardsi var. leviusculus Dana, 1852. 
Alpheus lockingtoni Coutiére, Proc. U. S. Nat. Mus., 36, 21, fig. 1, 1909. 
Wer xe 
C 
Fig. 54. Synalpheus lockingtoni; a, third leg, X about 10; b, end of telson, 
X about 10; c, large chela, X about 7144; d, frontal margin and right side of 
antennal region, X about 10. 
