386 A. Alcock — Qar etiological Fauna of India. [No. 3, 



Chelipeds in the male subequal, massive, especially as to the palm. 

 Legs long and slender. 



The abdomen of the male does not quite fill all the space between 

 the last pair of ambulatory legs. 



77. Elamena sindensis, n. sp. 



Carapace broadly piriform, smooth, flat, with no distinction of 

 regions : its edge, which is slightly turned up, is entire and unarmed. 

 Front a prominent broad triangular lamina, somewhat rounded at tip. 

 No post-ocular tooth. Interantennular septum very prominent. Eyes 

 not quite concealed beneath the front. 



Male chelipeds about If times as long as the carapace, palm massive 

 and somewhat swollen, fingers stout and pointed and meeting through- 

 out their length. Female chelipeds little longer than carapace, slender, 

 with a slender palm and longish fingers spooned at tip. 



Legs slender, the 1st pair not three times as long as the carapace : 

 in all, there is a distinct tooth at the end of the anterior border of both 

 the merus and carpus, and the dactylus is long compressed and falcate 

 with two or three teeth at the end of its posterior border. 



In the Indian Museum are 7 specimens from Karachi : the enrapace 

 of a male is 5 millim. long and 6 in greatest breadth. 



78. Elamena truncata (Stimpson ?). 

 I Trigonoplax truncata, Stimpson, Proc. Ac. Nat. Sci. Philad. 1858, p. 109. 

 Elamena truncata, A. Milne Edwards, Nouv. Archiv. du Mns. IX. 1873, p. 323 : 

 J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 395. 



Carapace orbiculate-ovate, smooth, flat, with no distinction of 

 regions, its edge, which is slightly turned up and entire and unarmed, 

 shows the faintest traces of angulation in 2 or 3 places. No post-ocular 

 tooth ; eyes quite concealed beneath the front. The front, though it 

 projects slightly beyond the carapace is broadly truncated, having its 

 free margin cut quite straight. Interantennular septum very prominent. 

 The female chelipeds and the legs are as in the preceding species, the 

 anterior border of the merus and carpus of all the legs ending in a 

 strong tooth. 



In the Indian Museum is a female from the Nicobars. 



Trigonoplax, Edw. 



Trigonoplav, Milne Edwards, Ann. Sci. Nat. Zool. (3) XX. 1853, p. 224. 



This is best regarded as a subgenus of Elamena, from which it 

 differs only in the following unimportant particulars : — (1) the edge of 

 the carapace is not turned up, (2) the interantennular septum is a mere 

 ridge, (3) the chelipeds in the male, as in the female, are very slender. 



