148 



Records of the Indian Museum. 



[Vol. XXIV, 



The lateral process of the antennule (text-fig. 16a) reaches 

 about to the middle of the basal segment ; the spine at the end 

 of the external margin extends beyond the middle of the second 



segment. The second and 

 third segments are to- 

 gether less than half as 

 long as the basal seg- 

 ment. The free portion 

 of the shorter ramus of 

 the outer flagellum is 

 longer than the fused 

 part, the latter compri- 

 sing only 3 segments. 

 The antennal scale (text- 

 fig. 16&) is about 3*2 times 

 as long as broad ; the 

 outer margin is slightly 

 concave and terminates 

 in a spine which reaches 

 almost to the end of the 

 lamella. 



The first peraeopods 

 (text-fig. lya) reach 

 about to the end of the 

 scale. The coxopodite 

 has the usual ventral 

 process and a similar 

 process, much better developed than in allied species, is present 

 on the basipodite. The carpus is equal in length with the chela 

 and is a little shorter than the merus ; the fingers are unarmed and 

 are nearly three-quarters the length of the palm. 



The second peraeopods are unarmed and are unequal and dis- 

 similar, both reaching considerably beyond the end of the scale. 

 In the larger limb (text-fig. lyb) the merus aud ischium are sub- 

 equal. The carpus is conical, about 2"3 times as long as its distal 

 breadth, and is half the length of the palm and rather more than 

 half the length of the merus. "The chela is somewhat swollen, with 

 fingers about two-thirds as long as the palm. In the middle of 

 the cutting edge of each finger there is a shallow excavation 

 bounded at either end by a small tooth ; the fingers in consequence 

 gape a little when they are closed. In the smaller limb the 

 carpus is much longer, only a little shorter than the palm and 

 three-quarters the length of the merus ; it is at least four times 

 as long as its distal breadth. 



The third peraeopods reach about to the end of the basal 

 segment of the antennule. The propodus in all the last three pairs 

 (text-fig. 17c) bears spinules on its posterior margin and is 

 from 5'5 to 6 times as long as the dactylus. The dactylus itself 

 (text-fig. ijd) is biunguiculate with a rather wide excavation 

 between the two claws. It is considerably broader than in any of 



TexT-fig. 16. — Periclimenes impar, sp. nov 



a. Antennule. 



b. Antennal scale. 



