377 



The peduncle of uropods I is linear and the same length as the 

 rami; the rami are narrow, with an acute apex; the endopodite is slightly 

 longer than the exopodite. The peduncle of uropods III is broadened and 

 slightly longer than the rami; the rami are narrow, with an acute apex, 

 and about equal in length. The telson is roundish-triangular, its width at 

 the base greater than its length and half the length of the peduncle in 

 uropods III. 



Distribution: A few specimens of this species were caught on the 

 Leptomedusae Phialidium in an expedition of the biological station Ville- 

 franche (the Mediterranean Sea). Although all the specimens were found 

 in the catches taken in the upper 50 m layer, Laval suggests that this 

 is a deep-water form, appearing incidentally in the surface layer due to 

 upwelling. 



Absent in our collections 



9. Genus Hyperioides Chevreux, 1900 



Chevreux, 1900: 143; Pirlot, 1929: 124.— Parahyperia Vosseler, 

 1901: 56. 



Small species, only 5-8 mm in length. 



The body is laterally compressed, more so than in Hyperia. The head 

 is round and without a rostrum. The eyes occupy almost the entire sur- 

 face or only the upper part of the head. Somites I and II of the pereon are 

 fused in both sexes. In females antennae I are two- to three-segmented 

 and antennae II one-segmented. The mandibles have a strong cylindri- 

 cal dentate process; the mandibular palp is absent in females. The outer 

 lobe of maxillae I bears three terminal spines. The basal segment of the 

 maxillipeds is very long, the inner lobes small, with two apical spines, 

 the coxal plates are fused with the somites of the pereon. Pereopods I 

 and II have a weakly developed chela; the distal process of the 5th seg- 

 ment is spoon-shaped. Pereopods V-VI are longer than pereopods III-IV 

 and VII. The claws of pereopods V-VII are long. 



Type species: Hyperioides longipes Chevreux, 1900. 



The genus includes two species. 



KEY TO SPECIES OF GENUS HYPERIOIDES 



1. Eyes occupy only dorsal surface of head. Antennae I in females three- 

 segmented. Distal process of 5th segment of pereopods II extends to 



middle of 6th segment 1 . H. longipes Chevr. 



— Eyes occupy not only dorsal but also lateral surface of head. Anten- 

 nae I in females two-segmented. Distal process of 5th segment of 



pereopods II extends to 1/4 length of 6th segment 



2. H. sibaginis (Stebb.). 



