TO INDIAN CARC1NOLOGY. 427 



233. Petrolisthes Bosch (Audouin). 



Porcelluna Boscii (Aud.), De Man, Mergui Crust, p. 217 (1888). 



(=P. ruffosa, Milue-Edw.) 



Eameswaram and Muttuwartu Par (Thurston) ; Baineswarani, not uncommon 

 (J. B. H). 



This species is allied to the last, but distinguished by the very different sculpture, 

 especially of the chelipedes. The carpal denticles are liable to considerable variation. 

 The lohe at the inner distal end of the merus is acute, and on the upper distal margin of 

 the same joint one or occasionally two spiuules are met with. 



Distribution. Bed Sea (Audouin, Heller, Kossmann, De Man) ; Mergui (De Man) ; 

 Kurachi (Brit. Mm.) ; N. Australia (Brit. Mm.). 



234. Petrolisthes militaris (Heller). 



Porcelluna militaris (Heller), De Man, Brock's Crust, p. 410 (1888). 

 Petrolisthes annulipes, Miers, ' Alert' Crust, p. 270, pi. xxix. fig. B (1881). 



Muttuwartu Par and Cheval Par (Thurston); Eameswaram {Thurston, J. B. H.). 



My specimens are identical with the types of P. annulipes, and at the same time are 

 referable to P. militaris, as defined by De Man. A supra-orbital spinule is present, but 

 the lateral frontal margins are simply crenulated and not spinulose. Behind the outer 

 orbital angle are two or three spines, the first placed on the margin and the others on 

 the branchial surface, while about the middle of the branchial margin are from two to 

 four spiuules. De Man regards P. annulipes as identical with P. scabricula, Dana ; but 

 in the latter the frontal margins are spinulose. I have, however, seen examples of the 

 present species in which the normal crenulations have become almost spinulose, so that 

 this identity may yet be established by further research ; in the meanwhile the two are 

 perhaps best kept apart. 



Distribution. Nicobars (Heller) ; Seychelles (Miers) ; W. coast of Java (De Man) ; 

 Philippines (White); N. Australia (Miers, Henderson); Loo Choo Is. (Ortmann). 



Genus Raphidopus, Stimpson. 



235. Eaphidopus indicds, n. sp. (PL XXXIX. figs. 19-22.) 



Madras, a male (J. B. H). 



The carapace is convex from side to side and from before backwards, with the regions 

 ill-defined and almost smooth, there being merely a few faint elevations on the branchial 

 areas, some of which, in particular posteriorly, form short granulated lines ; two very 

 slight elevations rise almost in the centre of the carapace. The front is nearly straight 

 when viewed from above, but looked at from before three projections can be seen, of which 

 the median is slightly the most prominent. On the lateral margin of the carapace about 

 a quarter of the distance back, is a well-defined notch, and between this and the external 

 orbital angle is a sharp obscurely crenulated margin. Behind the notch the margin is 

 convex and distinctly crenulated, but terminates abruptly by passing on to the surface 

 of the carapace, leaving the posterior fourth of the side of the carapace simply rounded 

 and marked by some of the elevated lines already referred to. The eyes are small. 



