— 5i — 



deep as the lower. Antennular peduncles without 

 any process from the distal outer angle of first joint 

 and with an at most slightly produced, acute angle 

 above near the distal outer corner of second joint. 

 No dorsal denticles or processes on the abdominal 

 segments. A 7 , boopis Calm. 



b. Frontal plate terminating in a slender rostrum. Eyes 

 black, with the upper section only somewhat deeper 

 than the lower. Antennular peduncles with a long, 

 spiniform process from the distal outer angle of first 

 joint and with a very conspicuous process from the 

 upper, outer angle of second joint. Conspicuous 

 dorsal denticles on at least two abdominal segments, 

 a. The process from second antennular joint with at 

 most the proximal half plate-shaped and the distal 

 half or the major part spiniform. Third to sixth 

 abdominal segment each with a single dorsal spini- 

 form process from the hind margin. 



N. flexipes Ortm. 

 ß. The process from second antennular joint is a 

 large, oblong plate slightly acuminate at the acute 

 end. Fourth and fifth abdominal segments each 

 with a dorsal row of three sharp denticles from 

 the hind margin, but no denticles from the other 

 segments. À 7 . sexspinosus n. sp. 



N. boopis Calm, is widely distributed in the Atlantic 

 and known from the Indian Archipelago (« Siboga») and 

 the Pacific (Ortmann; Agassiz Exp.). 



N. flexipes Ortm. occurs in the tropical and temperate 

 North Atlantic and the tropical East Pacific. 



N. sexspinosus n. sp. seems to be rare ; I have seen 

 only three specimens, all adult males, two from the tropi- 

 cal East Pacific (Agassiz Exp. Stat. 4699) and the third 

 from the temperate North Atlantic (iMonaco, Stat. 2io5). 



(210) 



