CALIFORNIA STALK-EYED CRUSTACEA. 185 



Allied to clamator. Front trispinose, the mediau spine the largest and 

 not separated from the lateral spines by sulci, Antenuules as in clamator; 

 the acicle of the antennas about reaches the tip of the peduncle and is sim- 

 ilar to that of clamator but the cleft between the spine and the inner por- 

 tion is not so deep as in that species. Maxillipeds pubescent, reaching to 

 the tip of the antennal peduncle. Chelipeds unequal, dissimilar; resem- 

 bling those of clamator, but presenting the following differences: The 

 transverse sulcus on the lower side of the larger hand is prolonged poste- 

 riorly on the inner side of the lower edge as a longitudinal sulcus, a 

 feature not present in that species; there is no longitudinal sulcus on the 

 inner surface of the hand separating the inner ends of the transverse sulci, 

 and the upper, transverse sulcus is not so deep as in clamator. The 

 smaller hand is sculptured much like the larger one but the sulci are not 

 so deep, nor the ridges so prominent; the pollex is rather slender, a little 

 shorter than the palm, and nearly longitudinal, curving a little downwards 

 and having a ridge on the outer side a little above and parallel with the 

 outer edge, the surface above which is somewhat excavated for the recep- 

 tion of the lower margin of the dactyl; dactyl contracted at the base but 

 expanded a short distance beyond into a high, thin, rounded lamina, the 

 plane of which is nearly vertical; the lower edge is nearly straight when 

 seen from the side but curved when seen from below and ends in a short 

 tooth which is curved downward and inward; its postero-external angle 

 has a flattened projection which, when the finger is opened, abuts against 

 a flattened projection of the palm as in the larger hand. Carpus of the 

 second pair of legs flve-jointed, the first joint about as long as the next 

 two combined, second and fifth joints subequal and each about as long as 

 the third and fourth together; hand narrow, fingers a little longer than 

 the palm which is somewhat shorter than the last joint of the carpus. 

 The two following pairs of legs not so stout as in clamator, neither the 

 merus nor carpus with a spine at the infero-distal angle; propodi armed 

 below with seven or eight pairs of spines; dactyls short, curved and 

 devoid of a subterminal spine. 



Length, 33 mm.; length of carapace, 12 mm.; of large hand, 17 mm.; of 

 small hand, 13 mm. 



Monterey; Santa Barbara! San Pedro! San Diego! 

 Alpheus barbara Lock. 



Alpheus clamator Kingsley (not Lockington), Bull. U. S. Geol. Sur., Vol. 



IV, No. 1, 1878, p. 197. 

 Alpheus barbara Lockingto.v, Ann. Nat. Hist. (5), Vol. I, 1878, p. 471. 



Kingsley, Bull. Essex Inst., Vol. XIV, 1883, p. 117. 



I have seen no specimens of this species. It was 

 described by Kingsley from a single imperfect specimen 



