1922.] 



S. Kemp : Notes on Crustacea Decapoda. 



T55 



teeth, of which the foremost and hindmost are rather remote from 

 the rest ; three posterior teeth stand on the carapace behind the 

 orbit. On the lower margin there are 3 teeth, the foremost small 

 and placed close to the apex. The hepatic spine is placed on 

 a lower level than the ahtennal. The two rami composing the 

 outer antennular flagellum (text-fig. 22a) are fused basally for a 

 much longer distance than in the related species ; the fused por- 

 tion is 3*5 times as long as the free part of the shorter ramus and 

 consists of 12 segments. The antennal scale (text-fig. 22b) is 



Text-fig. 22. — Peridimenes alcocki, 

 sp. nov. 



a. Antennule. 



b. Antennal scale. 



Text-fig. 23. — Peridimenes alcocki, 

 sp. nov. 



a. Larger second peraeopod. 



b. Fingers of same leg. 



broader, scarcely more than twice as long as wide; the outer 

 margin is convex and terminates in a spine which reaches nearly 

 to the end of the lamella. The carpus of the first peraeopods is 

 proportionately longer than in either of the related species and 

 is 1-5 times the length of the chela. 



The second peraeopods (text-fig. 23a) are unequal and are 

 closely covered throughout with small tubercles, a remarkable 

 character also found in certain species of the subgenus Ancyloca- 

 ris. The fingers in both limbs are almost exactly half the length 



