86 Records of the Indian Museum. [Yol. XIY, 



The frontal and post-orbital reoions are smooth, save for a large and 

 deep pit on the latter behind the cornea of the eye. There are two low 

 eminences on the front which do not conceal the margin when the cara- 

 pace is viewed from above. The front, in a true dorsal view, is seen to 

 be deeply and widely emarginate in the middle, with the outer angles 

 a trifle produced ; it is thus very obscurely quadrilobate. The upper 

 orbital border is smooth ; the outer orbital angle is large and rectangular 

 and is separated from the obscurely crenulated lower border by a wide 

 notch. 



The antero-lateral border is strongly curved and very much shorter 

 than the postero-lateral, and is characteristic in structure. In the pos- 

 terior part of its course the border is defined as a ridge bearing serrations 

 which gradually assume the form of spinules from behind forwards. 

 In front of these serrations the margin is not defined as a crest, but its 

 position is indicated by a variable number of very sharp isolated spines, 

 the foremost being the largest. As a rule there are three of these spines, 

 less commonly two or four (text-fig. 2ft, b) ; they vary considerably 

 in relative size and position and some of them occasionally bear a 

 subsidiary denticle. 



The median tooth on the lower edge of the epistome is rather narrower 

 than usual. The surface of the epistome, together with a small portion 

 of the carapace on the outer side of each efferent branchial opening, 

 bears some coarse hairs. The ischium of the external maxilli pedes is 

 grooved as usual and the merus is rounded in outline and as long as 

 broad (text-fig. 2c). On both ischium and merus there are some short 

 hairs. 



The chelae are unequal in both sexes. The two lower margins of 

 the merus are tubercular and the customary tooth is present on the 

 lower surface near the carpal articulation ; on the upper surface there 

 are some transverse rugae. The carpus is very coarsely and irregularly 

 pitted above and there is usually a distinct depression or umbilication 

 near the chela. The inner margin of the upper surface, above the large 

 carpal spine is defined anteriorly by a blunt ridge and posteriorly by a 

 row of four to six tubercles. In old females ^ the larger chela is deep, 

 little more than twice as long as broad in lateral view, the lower border 

 is sinuous, being emarginate at the distal end of the palm, the fixed 

 finger is strongly curved with its lower edge convex and the fingers 

 gape very widely at the base (text-fig. 2d). In young examples of both 

 sexes, and in the smaller chelae of large females, the length of the chela 

 is more than two and a half times its breadth, the lower border is nearly 

 straight and the fingers gape but little when the claw is closed. The 

 palm bears some transverse rugae on its upper surface, but is otherwise 

 smooth both within and without, except for scanty pitting. On the 

 outer side of the palm near the upper border there is a longitudinal 

 depression. There are longitudinal rows of pits on the fingers but no 

 distinct grooves. The teeth on the inner margins are conspicuous in 

 small specimens and in the smaller chelae of large individuals. In the 

 larger chelae of well grown examples they tend to become obsolete at the 

 base. The pits on all the segments of the chela are sometimes found 



^ I have not examined any large males. 



