CALIFORNIA STALK-EYED CRUSTACEA. 187 



auteunal peduncle. Anterior chelipeds very unequal; merus of both 

 members compressed, and devoid of a spine at the supero-distal angle; 

 carpus without a tooth or spine; hand of large cheliped large, oblong, 

 compressed, upper and lower sides constricted near the middle, the upper 

 constriction formed by a short, transverse groove a short distance behind 

 the dactyl; pollex curved upwards and inwards at the tip and deeply exca- 

 vated at the base for the reception of the dactyl; dactyl compressed, 

 shorter than the palm, the outer margin strongly convex, the inner more 

 or less concave and having a flattened process near the base which fits into 

 the excavation in the pollex. Smaller hand long, narrow, pubescent, 

 somewhat compressed and devoid of sculpturing; fingers narrow, straight, 

 subequal to the palm, the tips hooked and crossing when closed. First 

 joint of the carpus of the second pair of legs long, exceeding the second, 

 which is about as long as the next two combined; third and fourth joints 

 subequal, each a little shorter than the fifth; hand shorter than the last 

 two joints of the carpus. The two following pairs of legs are stouter than 

 the last pair; merus devoid of a spine; propodi strongly spinose below. 

 The sides of the first five abdominal segments are rounded. Telson broadly 

 rounded at the tip and armed above with two pairs of spinules. 



Length, 37 mm.; length of carapace, 12.5 mm.; of large hand, 15 mm.; 

 of small hand, 9 mm. 



San Pedro, Calif.; dredged in the harbor, July, 1895. 

 Collection University of California. 



Alpheus equidactylus Lock. 



Alpheus equidactylus LOCKINGTON, Proc. Gal. Acad. Sci., Vol. VII, 1877, 

 p. 35; Ann. Nat. Hist. (5), Vol. 1, 1878, p. 472. KINGSLEY, Bull. U. S. 

 Geol. Sur., Vol. IV, No. 1, 1878, p. 199; Bull. Essex Inst., Vol. X, 

 1878, p. 59; Ibid., Vol. XIV, 1883, p. 111. 



Carapace smooth, convex longitudinally on the upper side. Front tri- 

 spinose, the median spine considerably larger than the lateral ones and not 

 separated from them by sulci. Basal spine of the antennules long, reach- 

 ing nearly to the tip of the second joint of the peduncle; last two basal 

 joints short and subequal; outer flagellum shorter than the more slender 

 inner one, the slender part much longer than the basal portion. Second 

 joint of the antenna with a spine below the acicle; acicle rather wide, 

 longer than the peduncle. Maxillipeds sparingly pubescent and about 

 reaching the tip of the antennal scale. Anterior chelipeds smooth, naked, 

 unequal, but of similar form; merus with the angles rounded and devoid 

 of spines or teeth; carpus short, similar to that of the larger cheliped in 

 clamator; hands oblong, narrow, compressed, smooth; a transverse sul- 

 cus crossing the upper edge of the hand behind the dactyl, from which a 



