236 Carcinohgical Fauna of India. 



margin is particularly broad : the regions of the carapace are not 

 delimited. Front short, hardly projecting beyond the general outline of 

 the carapace, hut projecting well beyond the edge of the buccal cavern. 

 Eyes minute : orbits with a long suture in the roof, and a small gap 

 at the inner canthus, but complete and affording complete concealment 

 to the eyes : the floor of the orbit is closely appressed to the roof of the 

 buccal cavern. Antennules folding a little obliquely. Antenna? ob- 

 solete. 



Buccal cavern longer than broad : the exopodite of the external 

 maxillipeds is elongate, and not much broader than the endognath, 

 and has its outer edge a little curved : the acutely triangular merus of 

 the endognath projects beyond the exognath, and is much longer than 

 the ischium, measured along the inner edge. 



The chelipeds, compared with the legs, are very massive : they 

 are depressed and laminar, and are about the same length as the cara- 

 pace : the fingers are stout, compressed, and very short. 



The legs are slender and compressed, and when flexed are almost 

 entirely concealed beneath the expanded edge of the carapace. 



67. Onyclwmorpha lamelligera, Stimpson. 



Onychomorpha lamelligera, Stimpson, Proc. Acad. Nat. Sci. Philacl., 1858, p. 

 162 : A. 0. Walker, Journ. Linn. Soc. Zool. XX. 1890 (1887), p. Ill, pi. viii. fig. 3. 



Carapace triangular with the sides slightly curved, a little longer 

 than broad ; depressed, laminar, and unguiform owing to the preponder- 

 ance of the broad laminar brim, to which the true carapace (the part 

 lodging the viscera) forms a low convex circular crown. 



The surface of the carapace is smooth, without any indication of 

 regions : the edge of the brim is elegantly striated. The under surface 

 of the body is also quite smooth, except for the striations all round the 

 edge of the carapace. 



The front is a little recurved upwards. 



The chelipeds, in the female, are a very little longer than the 

 carapace : the arm is sharply trigonal, with the outer edge cristiform, 

 the edge of the crest being finely striated like the edge of the carapace : 

 the outer edge of the wrist is carinate, and a ridge traverses the upper 

 surface of the wrist: the hand is laminar with the edges sharp and 

 striated beneath a copious spongy pubescence ; it is rather more than 

 half again as long as broad, and more than twice as long as the com- 

 pressed fingers. 



The legs are short and slender, with the merus, carpus and propod- 

 ite carinated, and the dactylus almost filit'oi-m. 



241 



