226 A. Alcock — Carcinological Fauna of India. [No. 2, 



the indexed surface below it having numerous punctuations and squa- 

 mous granules. 



The thoracic sinus is a simple cavity defined ventrally by a loop of 

 small somewhat irregular granules, and not very well defined in front. 



The front is broader than long, dorsally convex, and its tip, which 

 is truncated pitted and deflexed, ends in 3 broad denticles. 



The ventral surface of the ischium of the external maxillipeds of 

 the female is smooth (non-carinate). 



The sub-cylindrical arm is closely nodular everywhere except in 

 the middle of the ventral surface ; the sub-globular wrist has about half 

 of its upper surface, and a band on the inner edge of its under surface, 

 granular : the hand is inflated, or sub-globular, with its base granular, 

 and its inner edge sharply crenulate : the fingers, which are not much 

 shorter than the hand, meet only at their tips, where alone they are 

 denticulate. 



The legs are compressed : the meropodites, which are much com- 

 pressed, are finely granular along the edges ; the carpopodites and 

 propodites are sharply carinate, dorsally ; the dactyli, which are nearly 

 as long as their propodites and carpopodites together, are narrowly 

 lanceolate. 



The abdomen of the female consists of 4 pieces, and the large third 

 piece is again subdivided into 3 pieces by two deep furrows which, 

 however, are broadly interrupted in the middle line. 



A single egg-laden female from the Andamans has the carapace 14 

 millim. long and 13'5 millim. broad. 



The colours, according to Bell, are light brown with small angular 

 red spots on the carapace, and a large red spot on the upper surface of 

 the hand. 



Our single specimen, which has been in strongly carbolized spirit 

 for over 20 years, is now an uniform stone grey. 



56. Leucosia cumingii, Bell. 



Leucosia cumingii, Bell, Trans. Linn. Soc. Vol. XXI. 1855, p. 290, pi. xxxi. fig. 

 3, and Cat. Leucos. Brit. Mus. p. 9. 



Carapace quite devoid of marginal fur, a little broader than long, 

 the inequality being hardly appreciable in the adult female, elegantly 

 hexagonal as in the preceding species. The anterolateral border, the 

 main curve of which would be slightly concave, is convex by reason of 

 the strongly marked angular projection of the hepatic region. The 

 anterolateral margin may be obscurely milled just in front of its junc- 

 tion with the true posterolateral border, but the latter, as well as the 

 posterior margin, is quite smooth: the posterior margin is gently curved, 

 and in the male prominent. 



