1898.] A. Alcock — Carcinological Fauna of India. 117 



In the Indian Museum besides a specimen from Japan is one from 

 off the Orissa coast, 11 fms. 



Xantho (Lophoxanthus) scaberrimus var. baccalipes. 

 Differs from the type in the following particulars : — 



(1) the characteristic tubercles have everywhere a worn appear- 

 ance, especially in the middle of the carapace and on the chelipeds and 

 the ischium of the external maxillipeds : 



(2) the dorsal crest of the arm and of the meropodites of the legs 

 have each become a row of berry-like teeth, and the serrated crest and 

 granular ridges of the carpopodites and propodites of the legs have 

 become merely low rough elevations. 



In the Indian Museum are three large males from Ceylon : the 

 largest has the carapace 47 millim. long and 61 millim. broad. 



Xantho (Lophoxanthus) scaberrimus var. cultripes. 



Differs from the type in the following particulars : — 



(1) the characteristic tubercles are still more "worn," especially 

 on the mesogastrium, and near the inner angle of the wrist, and near the 

 base of the thumb, where they are almost worn away : 



(2) the dorsal crest of the arm (with its foliaceous terminal 

 lobes), and the crests of the merus carpus and propodite in all the legs, 

 are greatly developed sharp and entire, and the raised rows of granules 

 ou the dorsal surfaces of the leg joints have almost disappeared. 



In the Indian Museum is a single male from Singapore, with a 

 carapace 50 millim. long and 64 broad. 



Sub-genus Leptodius, A. Milne Edwards. 



Leptodius, A. Milne Edwards, Ann. Sci. Nat., Zool., (4) XX. 1863, p. 284: Nouv. 

 Archiir. du Mus. IX. 1873, p. 221 : Miss. Sci. Mex., Crust, p. 267, ubi synon. 

 Leptodius, Miers, Challenger Brachyura, p. 136. 



Leptodius (e.g. Leptodius exaratus) resembles Xantho (e.g. Xantho 

 flnridanus) in general form and proportions, but differs most conspicu- 

 ously in having the fingers hollowed out "en cuillere" at tip. But this 

 divergence is almost bridged by Leptodius crassimanus, in which the 

 spooning of the fingers is indistinct. 



Leptodius further differs from the type of Xantho (1) in the 



greater convergence of the postero-lateral borders, (2) in the often 



but not always — more than four-lobed antero- lateral border, and (3) in 

 the often more extensive contact of the basal antennal joint with the 

 front. 



