1900.] A. Alcock — Oarcinological Fauna of India. 281 



Ocypodoids ; so that both his Piniioteridse and Ocypodidse are far more 

 natural families than those of Miers. I am doubtful, however, whether 

 Ortmann has assigned its full rank to Mictyris, or their proper place to 

 the Hexapodinte. 



The Catometope crabs of the Indian fauna number about 140, of 

 which 136 are noticed in the present paper. Of these, 31 are 

 new to science, and include 2 species of Libystes, 1 of Psopheticus, 2 of 

 Litochira, 1 of Notonyx, 1 of Ceratoplax, 1 of Typhlocarcinus, 2 of 

 Pinnoteres, 3 of Dotilla, 2 of Scopimera, 1 of Clistostoma, 1 of Tylodiplax, 

 1 of Elamena, 2 of Hymenicus, 2 of Ptychognathus, 1 of Pyxidognathus, 

 3 of Sbsarma, 2 of Palicus (Gymopolia) , and 1 of each of the following 

 new genera, Typhlocarcinodes (Rhizopinse), Lambdophalhts (Hexapodinae), 

 and Qhasmocarcinops (Asthenognathinse). 



The new species are, for the most part, either little crabs that are 

 liable to be overlooked, or inhabitants of depths which, though moderate, 

 are inaccessible to ordinary collectors. 



As heretofore, most of the new species come from the copious collec- 

 tions of the " Investigator " and will be duly figured in the Illustrations 

 of the Zoology of the R.I.M.S. Investigator. 



Tribe CATOMETOPA. 



Qiiadi'ilatera, Latreille (pt.), Fam. Nat. du Regne Aniiu. p. 269. 



Catometopes, Milne Edwards (pt.), Hist. Nat. Crust. II. p. 1. 



Cancri (pt.), Ocypodes, Grapsi, Pinnotheridea, De Haan, Faun. Japon. Crust. 



Ocypodidse, Milne Edwards (pt.), Ann. Sci. Nat., Zool., (3) XVIII. 1852, pp. 128, 

 140. 



Grapsoidea, Dana, U. S. Expl. Exp. Crust, pt. I. pp. 67, 306. 



Catometopa, Miers, Challenger Brachyura, p. 216. 



Catometopa, Ortmann, Zool. Jahrb., Syst. VII. 1893-94, pp. 411, 683, plas 

 Majoidea Hymenosomidx, p. 31 : and in Bronn's Thier Reich, V. ii. Arthropoda, pp. 

 1165, 1168, 1175. 



The carapace is variable, but commonly and typically it is trans- 

 verse, more or less quadrate, with large branchial and small and 

 indistinct hepatic regions and a broad front. The front also is variable 

 in form, but typically it is much deflexed. 



The orbits, typically, occupy the whole or the greater part of the 

 anterior border of the carapace on either side of the front. The 

 typical fold of the antennules is transverse ; but it may be oblique, or 

 nearly vertical, and in a few cases there are no distinct fossae at all into 

 which these appendages can fold. 



The epistome, typically, is extremely short, but occasionally it is 



