346 



Fig. 142. Hyperoche medusarum (Kroyer), female (after Sars, 1890; Hurley, 1955). 



284 



half the length of the head and considerably longer than the peduncle 

 of the antennae. The segments of the peduncle of antennae II are nar- 

 rower than in antennae 1; the flagellum consists of 25-30 segments. The 

 antennae in young males are markedly shorter than in sexually mature 

 adults. 



The mandibles have a denticulate cutting edge; the dentate process 

 is well developed and resembles a triangular plate. The outer lobes of 

 the maxillipeds are oval, with a round apex, and denticulate in the distal 

 part of the inner margin; the fused inner lobes are large and apically bear 

 short setae. 



The 2nd segment of pereopods I is broadened, with a convex anterior 

 margin, its width about half its length, and its length equal to all the 

 other segments together; the distal lobe of the 5th segment is acuminate 

 and denticulate along the convex anterior margin, almost extends to the 

 distal end of the oval-conical 6th segment, and has a finely denticulate 

 posterior margin; the slightly curved claw also has a denticulate posterior 

 margin. Pereopods II are slightly longer than pair I; the 2nd segment is 

 relatively narrower; the lobe of the 5th segment is narrower and exceeds 

 the 6th segment in length; the ventral and partially the lateral surface 

 of the 3rd-5th segments bear short tender setae; the claw is free, not 

 stretched, and has a denticulate posterior margin. In pereopods III and IV 

 the posterior margin of the 5th and 6th segments is finely denticulate and 



