1896.] A. Alcock — Carcinological Fauna of India. 177 



The chelipeds in the female are about one-fourth longer than the 

 carapace, and are closely covered with small flat smooth granules : the 

 arm is trigonal, with larger granules along the edges : the hand is 

 somewhat inflated, a little longer than broad, and not much more than 

 half the length of the fingers : the fingers are curved and are hollowed 

 on the inner face : the immobile finger is distinctly constricted off from 

 the hand, and is not vastly more massive than the mobile finger. 



The legs are as in T. petrseus. 



The largest adult (ovigerous) female has the carapace 9 millira. 

 long and 11 millim. broad. 



Log. Andamans. Seven females. 



Heteronucia, n. gen. 



Carapace strongly convex, broader than long, its surface both gran- 

 ular and tubercular (or coarsely spinous) : the regions distinct. 



Front bidentate, sunk behind the edge of the mouth-parts and of 

 the puffed out pterygostomian regions. 



Orbits complete but shallow, not concealing the rather large eyes 

 in flexion. The basal antennal joint is fused with the orbit and with 

 the front, and the extremely minute antennary flagellum is entirely 

 inside the orbital wall. The antennules fold obliquely. 



The epistome is exceptionally broad. 



The external maxillipeds completely close the buccal cavern ; the 

 exopodite is narrow, with the outer edge straight ; the merus is about 

 two-thirds the length of the ischium measured along the inner border. 



The chelipeds are massive and are about half again as long as the 

 carapace : the hand is short, broad and swollen : fingers a good deal 

 longer than the hand, stout, closely meeting throughout their extent, 

 curved and concave on their inner face, opening vertically : the immobile 

 finger is a good deal more massive than the dactylus. 



Legs stout, the meropbdites slightly hidden in flexion. 

 This species has, at first sight, a general resemblance to Nucia speciosa, but is 

 at once distinguished by the form of the orbits, antennge and chelipeds. 



21. Heteronucia vesiculosa^ n. sp. Plate VIII. fig. 1. 

 The whole surface of the body and of the appendages (except the 

 fingers and dactyli) is covered with crowded vesiculous granules 

 without any space between them. 



Carapace a good deal broader than long, strongly convex : on either 



lateral margin are eight coarse spines or acute tubercles, the first of 



which is at the antero-external angle of the buccal cavern, the last of 



which is at the junction with the posterior border : in addition the 



J. II. 23 



