Zoological Society, 



Family HiPPiDiE. 

 CosMONOTUS, Adams and White. 



287 



CosMONOTus Grayii, Adams and White, List of Crustacea, p. 129. 



Carapace oval (about an inch in length and half an inch wide), 

 very much compressed laterally, especially in front, with a distinct 

 prominent keel extending down the middle line, very strongly marked 

 in front, but fainter posteriorly ; the surface covered with numerous 

 minute depressed punctures. 



Front with two very small spines on each side of a deep angular 

 notch, in which are placed the eyes. 



Chelae trigonal, the inferior part plane, the exterior convex, with 

 transverse, interrupted, engraved or depressed lines, the upper angle 

 covered with long thick hairs ; the inner surface concave. Carpus 

 incurved, subcompressed, convex externally, but less convex inter- 

 nally, and ending above and in front in a blunt spine ; hand com- 

 pressed, elevated, with the upper edge arched, but not so sharp as in 

 Notopus ; the sides convex and covered with asperities or minutely 

 denticulated ridges, interrupted and transverse ; finger uncinate, very 



