1922.] S. Kemp : Notes on Crustacea Decapoda. 209 



In other respects there is practically no difference between 

 the two sets of specimens. The young male resembles typical 

 specimens of the same size and sex in the proportions of the seg- 

 ments of the second peraeopods. The carpus is about 7 times as 

 long as its distal breadth and is a trifle longer than the merus ; 

 the chela is i'5 times as long as the carpus. In females the car- 

 pus is a little shorter than the merus and, in all the specimens, the 

 carpal spine is conspicuous. The merus of the third leg is 12 to 

 13 times as long as broad in females, 17 times in the young male. 



In the absence of fully developed males it is not possible to 

 identify the specimens with certainty, but the material examined 

 seems to point to the conclusion that the muddy ground at the 

 inner end of Port Blair is inhabited by a special variety of P. anda- 

 manensis. 



The largest female is about 18 mm. in length. 



C 382-3/1. Port Blair, Andamans, S. Kemp, Feb., Nine. 



3-5 fms. March, 192 1. 



The specimens were obtained off Viper I. and at the mouth 

 of Brigade Creek on a bottom composed of mud and decaying 

 vegetation. 



Periclimenes (Ancylocaris) suvadivensis Borradaile. 



1915. Periclimenes {Falciger) suvadivensis, Borradaile, Ann. Mag. 



Nat. Hist. (8) XV, p. 212. 

 191 7. Periclimenes (Falciger) suvadivensis, Borradaile, Trans. Linn. 



Soc. (2) Zool. XVII, p. 375, pi. lv, fig. 16. 



I have examined the types of this species and find that Bor- 

 radaile was mistaken in supposing that they do not possess a supra- 

 orbital spine. The species thus finds a place in the P. grandis 

 section and is extremely closely allied to P. andamanensis. Un- 

 fortunately I was not able to make a critical comparison of the 

 two forms and the only characters that I can now give for the 

 separation of the two species are that (i) the upper rostral teeth (6 

 or 7) are less numerous in P. suvadivensis than is customary in 

 P. andamanensis and (ii) that the carpus of the second peraeopods 

 in adult males is conspicuously longer than the merus in the' for- 

 mer species, whereas in the same sex of the latter the merus is 

 longer than the carpus. 



The species was described from specimens taken at Suvadiva 

 Atoll in the Maldives. 



Periclimenes (Ancylocaris) ensifrons (Dana). 



1852. Anchistia ensifrons, Dana, U. S. Explor. Exped., Crust. I, 



p. 580, pi. xxxviii, figs. la-g. 

 1899. Periclimenes ensifrons, Nobili, Ann. Mvs. civ. Genova (2) XX, 



P. 234. 

 1907. Periclimenes ensifrons, Nobili, Mem. Accad. Sci. Torino (2) 



I. VI I, p. 3sq. 



Nobili (1907) has examined two young specimens of this 

 species from Polynesia and has pointed out that they differ from 



