Indian Deep-sea Crustacea. 11 



depressed, the regions faintly indicated by slight inequalities 

 of level, its surface very finely granular. 



The front, which is about a fourth the greatest breadth of 

 the carapace, forms a thin laminar three-lobed projection. 

 The antero-lateral borders, which are hardly arched and are 

 not much more than half the length of the postero-lateral, are 

 thin and are cut into four procurved teeth, of which the fore- 

 most is the orbital angle and the largest and the hindmost is 

 spine-like and the longest. Postero-lateral borders slightly 

 convergent ; posterior border concave. 



Eye- stalks short and thick, eyes large; orbits deep, two 

 obsolescent sutures in the roof, a shallow notch in the outer 

 wall, the inner angle of the floor almost as prominent as the 

 outer frontal lobes. 



Antennules folding transversely, their fosses widely open 

 to their respective orbits. The antennae lie loosely in the 

 orbital hiatus ; the basal joint is short, slender, and movable, 

 the second joint just reaches the turned-down edge of the 

 front ; the flagellum is considerably longer than the orbit. 



Epistome well delimited from the palate. Though the 

 expiratory channels are well-defined grooves there are no 

 distinct palate-crests. The external maxillipeds fall far short 

 of the anterior margin of the buccal cavern, leaving the 

 expiratory canals permanently open. 



Chelipeds massive, somewhat unequal, about two thirds as 

 long again as the carapace, smooth; the hand, of which 

 about half is formed by the fingers, forms rather more than 

 half their entire length ; the inner angle of the wrist is a 

 large acute spine, and there is a spinule on the upper edge of 

 the hand just behind the finger-joint. 



Legs smooth ; a notch and spiniform tooth at the far end 

 of the upper border of all the meropodites. The first three 

 pair are nearly twice the length of the carapace ; the last pair 

 are not much longer than the chelipeds and have the carpus 

 shortened and the next two joints paddle-like and plumed. 



Family Carcinoplacidse. 



Pilumnoplax, Stimpson. 



Pilumnoplax Sinclairi, sp. n. 



Carapace subquadrilateral, much depressed, a little more 

 than three quarters as broad as long, very finely frosted, 

 perfectly bare, the regions fairly indicated. 



Front horizontal, slightly prominent, square cut, grooved 



