Carcinological Fauna of India. 335 



borders are sharply defined and gi'anular. Front very distinctly bilobed 

 prorainent. 



Clielipeds in the male very unequal, the larger one being twice as 

 long as the carapace, its chief bulk being contributed by the hand, 

 •which, with its large swollen polished palm and long crooked fingei's 

 meeting only at tip, recalls that of Gelasimns. The smaller cheliped 

 (like the female chelipeds) is not much shorter than the larger one nnd, 

 like it, has the articulation of the wrist confined to a rather prominent 

 postero-infeiior lobe of the hand, and the fingers longer than the palm : 

 the chief difference is that the palm is not enlarged and swollen and that 

 the fingers meet throughout almost all their extent. In both chelipeds 

 the suifaces of all the segments are smooth, and there are sharpish 

 granules along the borders of the arm and at the not very pronounced 

 inner angle of the comparatis'ely slender wrist. 



The legs, like the fingers of the smaller cheliped, are fringed, but 

 not very thickl}", with hair. The 3rd pair are very slightly the longest, 

 being twice the length of tlie carapace. The edges of the meropodites 

 are fiiinished with sharp granules and spinules, these being abundant 

 in the case of the first 3 pniis and rather few on the 4th pair. In the 

 first 3 pairs also the carpopodites are of good length and subcylindrical, 

 and the dactyli straight and almost styliform; but in the 4th pair the 

 two terminal joints are compressed, the carpopodite being shortened and 

 the dactylus recurved. 



A male and a female from off Madras, 12 fathoms. The carapace 

 of the male is 11 millim. long and 12 millim. broad. 



Subfamily Pinnotherelin.*;. 

 Tetrfas, Rathbun. 

 Tetrias, Rathbun, Proc. U. S. Nat. Mus. XXT. 1898, p. 607. 



Carapace strongly calcified, broader than long, deep, subquadrang- 

 ular, dorsally flattish, autei-iorly declivous, the regions faintly indic- 

 ated. 



Front between a third and a fourth the greatest breadth of the 

 carapace, its edge only deflexed, not directly united to the cpistome. 

 Orbits circular, small : eyestalks short, eyes small. The antennules 

 fold a little obliquely from the transverse. Antennae small, the flagellum 

 in the orbital hiatus. 



Epistome well defined : buccal cavern broadish, quadrilateral. 

 External maxillipeds large, their palp about as large as their merus 

 and ischium combined : i.schium distinct, small ; merus very large, 

 carpus large and triangular and articulating at the antero-external 



677 



