588 



is very small. Pereo- pods II are similar in structure to pereopods I but 

 longer and the 3rd-7th segments shorter than the 2nd. The 2nd segment 

 of pereopods III is much shorter than the successive segments together. 

 Coxal plate V is similar in structure to that in P. typhoides; the 2nd 

 segment of pereopods V is oval and 1.3 times longer than wide; the 

 3rd-7th segments together are equal in length to the 2nd; the 4th segment 



474 is shorter than the 5th and equal in length to the 6th. The maximum width 

 of the proximal half of the 2nd segment of pereopods VI is 1.5-1.7 times 

 that in the distal part; the 3rd-7th segments together are less than 1/3 the 

 length of the 2nd; the 4th segment has a small rounded distal process 

 reaching 1/3 the length of the next segment; the 5th segment is almost 

 half the length of the 4th but much narrower; the 4th-5th segments have a 

 denticulate anterior margin, the 6th segment is equal to the 5th in length 

 but narrower; the claw is slightly bent forward and 1/3 the length of the 

 6th segment. The shape and width of the 2nd segment of pereopods VII 

 are highly variable: it may be broad with a convex posterior margin and 

 concave anterior margin or very slightly broadened; the 3rd-7th segments 

 together in individuals with a broad 2nd segment are 1/2-2/3 its length 

 and in individuals with a narrow 2nd segment only slightly shorter or 

 equal in length; the claw is small, curved, and firmly pressed to the distal 

 margin of the 6th segment. 



Uropods I are the same as in P. typhoides. The endopodite of uropods 

 II, as also in uropods III, is 1.2-1.4 times longer than the exopodite. 



The telson and the last urosomite are the same as in P. typhoides. 



Distribution: Known from the Atlantic (34° N to 3° S), Indian (Sri 

 Lanka), and Pacific (Philippines, New Zealand, Nasca ridge, region of 

 eastern Australia) oceans, and the Mediterranean Sea. It lives in the upper 

 200 m layer. 



5. Genus Hemiscelus Stewart, 1913 



Stewart, 1913: 259. 



The genus Hemiscelus and its only species H. diplochelatus were 



475 described by Stewart (1913) from a single 2 mm long female specimen; 

 furthermore, the specimen was greatly damaged. No other investigator 

 has come across this species since then. It is also absent in our collections. 



Type species: Hemiscelus diplochelatus Stewart, 1913. 



1. Hemiscelus diplochelatus Stewart, 1913 (Fig. 256) 



Stewart, 1913: 259. 



The body is wide and compact and the pereon is slightly bulged. 

 The head is short, flattened anteriorly, and somewhat higher than the first 

 somites of the pereon. 



