304 A. Alcock — Garcinological Fauna of India. [No. 3, 



Front proper about a third the greatest breadth of the carapace, 

 remarkably prominent, as faintly as possible notched in the middle 

 line. 



Orbits shallow, their upper border sinuous but entire, their major 

 diameter about half the width of the front. Eyes small. 



Antero-lateral borders of carapace not two-thirds the length of the 

 postero-lateral, moderately arched, armed with two pro- curved spine- 

 like teeth, and with a small blunt denticle just behind the ill-defined 

 orbital angle. 



Chelipeds twice the length of the carapace ; the arm has a denticle 

 beyond the middle of the upper border, and there is a strong spine — 

 with sometimes a secondary spinule at its base— at the inner angle only 

 of the wrist. 



The legs are long and have the dactylus well plumed and the 2 

 preceding joints more scantily hairy : the third pair, which are slightly 

 the longest, are nearly 2J times the length of the carapace : though the 

 terminal joints of the fourth (last) pair are compressed they are not so 

 subfoliaceous as those of G. longimanus. 



In the Indian Museum are 20 specimens from the Andamans 220 to 

 290 fathoms and off Tra van core, 430 fathoms. 



In the largest specimen the carapace is 14 millim. long and 17 

 millim. broad. 



In spirit the colour is white with a faint pink tinge, the fingers 

 blackish-brown. 



7. PSEUDORHOMBILA, Edw. 



Pseudorhombila, Milne Edwards, Hist. Nat. Crnst. II. 59, nnd Ann. Sci. Nat., 

 Zool., (3) XVIII. 1852, p. 164. 



The only particulars in which Pseudorhomblla differs from Carcino- 

 flax are that the regions of the carapace are better defined, that the 

 square-cut front is more distinctly bilobed, that the supra-orbital border 

 has two distinct sutures, and that the dactvli of the last pair of legs are 

 styliform. 



The only specimen in the Indian Museum that is perhaps referable 

 to this genus is too small and too much damaged for description : it is 

 from the Andamans. 



Libystes, A. M. Edw. 



TAbystes, A. Milne Edwards, Ann. Soc. Entom. France, (4) VII. 1867, p. 285, and 

 Nonv. Archiv. du Mus. IV. 1868, p. 84. 



This genus unites Cai'dnoplax with Catoptrus. It chiefly differs 



