392 



have a subchela or a poorly developed chela. Pereopods II have a chela; 

 the distal process of the 5th segment is spoon-shaped. The distal mar- 

 gin of the 6th segment of pereopods VI and VII and sometimes V also, 

 is produced as a small plate anned with spines. Pereopods VII are not 

 armed. Pereopods III-VII are approximately equal in length"^. 



Type species: Hyperia luzoni Stebbing, 1888. 



The genus includes five species. 



KEY TO SPECIES OF GENUS HYPERIETTA 



1 . Fifth segment of pereopods V-VII with strong spine on anterior distal 

 angle 3. 



— Fifth segment of pereopods V-VII without strong spine on anterior 

 distal angle 2. 



2. Second segment of pereopods I with highly convex anterior margin. 



Width of 2nd segment of pereopods V, 3/4 its length 



2. H. vosseleri (Stebb) 



— Second segment of pereopods I deeply concave in distal part of ante- 

 rior margin. Width of 2nd segment of pereopods V, 2/3 its length . . 

 • I. H, luzoni (Stebb.) 



3. Anterior margin of head uniformly rounded. Pereon not more than 

 two-three times longer than head 4. 



— Anterior margin of head (lateral view) flat below place of attachment 



of antennae I. Pereon four times longer than head 



5. H. parviceps Bowm. 



4. Fifth segment of pereopods I with spine in middle part of posterior 

 margin. Sixth segment of pereopods I and II with one spine on ante- 

 rior margin. Maxillipeds with solitary spinules along inner margin of 

 outer lobes 4. H. stephenseni Bowm. 



320 — Fifth segment of pereopods I without spine in middle part of posterior 

 margin. Sixth segment of pereopods I and II with two spines on 

 anterior margin. Maxillipeds with spines on anterior surface of outer 



lobes, but apical part covered with minute setae 



3. H. stebbingi Bowm. 



1. Hyperietta luzoni (Stebbing, 1888) (Fig. 168) 



Stebbing, 1888: 1382 {Hyperia); Bovallius, 1889: 212 {Hyperia); 

 Lo Bianco, 1903: 278 {Hyperia); Stephensen, 1924: 84 {Hyperia); Hur- 

 ley, 1969: 19 {Hyperia); Bowman, 1973: 55; non Vosseler, 1901: 64 

 {Hyperia); Stebbing, 1904: 33 {Hyperia). 



"* Diagnosis of the genus and description of its constituent species are given after 

 Bowman (1973) with some emendations. 



