394 



longer than wide; the distal process of the 5th segment is 1/3 the length 

 of the 6th segment. Pereopods III-IV are very thin. Pereopods V-VII are 

 much stronger; the 2nd segment is broadly oval; the 4th and 5th segments 

 do not bear long spines. The triangular telson is somewhat longer than 

 its width at the base; in females it is 5/6, in males 1/2 the length of the 

 basipodite of uropods III. 



Notes: H. luzoni is very close to H. stebbingi and H. stephenseni 

 described below. Therefore, to which of these species the specimens of 

 H. luzoni of earlier authors actually belong, is not known. 



Distribution: Found near the Philippines, central and southeastern 

 part of the Pacific Ocean (38°06' S, 88°02' W), coastal areas of Cali- 

 fornia, and Gulf of California. It is possible that this species has been 

 found at some stations in the tropical Atlantic and the Mediterranean 

 Sea. 



Absent in our collections. 



322 2. Hyperietta vosseleri (Stebbing, 1904) (Fig. 169) 



Stebbing, 1904: 33 (Hyperia); Stewart, 1913: 225 (Hyperia); 

 Chevreux, ^1935: 189 (Hyperia); Bowman, 1973: 5S.—fabrei Bovallius, 

 1889: 206' (Hyperia); Vosseler, 1901: 58 (Hyperia); Stephensen, 1924: 

 83 (Hyperia); Yang, 1960: 33 (Hyperia). 



Length of sexually mature males 3-4 mm, of females 2-3 mm. 



The height of the head is slightly more than twice its length; viewed 

 laterally, the head tapers downward more significantly than in other 

 species of this genus. 



Antennae I of females project beyond the lower margin of the head. 

 In a lateral view the antennal gland appears to project on the mouth 

 cone. 



The mandibles have a smooth cutting edge and the left mandible an 

 additional plate. The outer lobes of the maxillipeds are short and broad, 

 their distal part narrowed and covered with minute setae, and the distal 

 margin is rugose. 



The 2nd segment of pereopods I is oval, its width half its length, 

 and its anterior margin convex; the 6th segment bears one submarginal 

 spine on the anterior margin. The distal process of the 5th segment of 

 pereopods II almost reaches the middle of the posterior margin of the 



323 6th segment. The 2nd segment of pereopods V-VII is very broad, has 

 a convex anterior margin, and its posterior distal angle forms a round 

 lobe. The roundish-triangular telson in females extends to 2/3, in males 

 almost 1/2 the length of the basipodite of uropods III. 



Distribution: A warm-water circumtropical species inhabiting the 

 upper 200 m layer. 



