478 STALK-EYED CRUSTACEA 



styliform finger, of which that of the posterior pair is the 

 shortest. 



The gills are attached to the body wall, to the mem- 

 brane between the body and the first joint of all the ap- 

 pendages, except the first maxillipede and the last pair of 

 legs, and to the first joint of the first maxillipede. Except 

 the last pair of legs, all are provided with branchial plates. 



Range. — West Indies, New Guinea, Fiji, Philippine 

 Islands ; in deep water. 



I. Oplophorus gracilirostris. 



Oplophonis gracilirostris . . A. Milne Edwards. 



The carapace is elevated and deeply notched behind 

 for the insertion of the abdomen ; there is a prolongation 

 in the form of a point on the posterior edge, outside the 

 articulation with first ring of the abdomen. A tri- 

 angular point forms the latero-posterior angle. There is 

 a very small spine below and another above the articula- 

 tion of the antennae. There is a keel above in the middle 

 line along its whole length. This keel is continued into 

 the rostrum, w^hich is thin, and has above six or eight small 

 teeth and seven below. Upon the gastric region the 

 median keel has on each side a small smooth keel. 



Range. — Dominica. 



3. Gonatonotus. 



Gonatonotus ... A. Milne Edwards. 



The carapace is thick, strongly keeled above ; this 

 keel is continued into the rostrum, which is very elevated 

 and laterally compressed. Its superior border and that 

 of the keel is divided into many teeth (above twenty-two). 

 Its inferior border has eight teeth, and laterally there is 

 a ridge which, starting from the orbital border, extends as 



