526 



in addition has a dense brush of fine setae in the distal part. The 2nd 

 segment of pereopods VI is approximately the same length as the distal 

 part of the leg, is proximally more markedly broadened than in pere- 

 opods V, and its anterior margin is barely bulged. The 2nd segment of 

 pereopods VII gradually tapers distally and its length is approximately 

 twice its maximal width. In the epimeral plates the posterior angle is 

 stretched into a pointed tooth. The basipodite of uropods I extends far 

 beyond the tip of the basipodite of uropods II, is denticulate on the inner 

 side and smooth on the outer, and is eight-nine times longer than wide; 

 the endopodite is appreciably longer than the exopodite and has den- 

 ticulate margins. In uropods II the inner margin of the basipodite and 

 the rami are denticulate and the tips of the rami reach the end of the 

 basipodite of uropods III. Uropods III are shorter than the telson; the 

 endopodite is almost the same length as the basipodite, whose length is 

 twice its width. The telson is 2-2.5 times longer than its width at the base. 

 Distribution: A tropical species found in three oceans, where it is 

 425 distributed from 38° N to 41° S, and is relatively euryhaline. It is also 

 found in the Mediterranean, Red, Sulu, and South China Seas. It inhab- 

 its the upper 100 m layer throughout its distribution, rarely penetrating 

 deeper. Reproduction apparently occurs year round. 



5. Genus Tullbergella Bovallius, 1887 



Bovallius, 1887a: 38; 1890: 68; Bowman and Gruner, 1973: 53. 



The body is compact with a broadened pereon. The head is spher- 

 ically bulged, relatively short, and higher than the first somite of the 

 pereon; the rostrum is about half the total length of the head. The neck 

 is absent. All the coxal plates are separate from the somites of the pereon. 

 Pereopods I and II terminate in subchelae formed by the distal margin 

 of the markedly broadened 5 th segment and the 6th segment. The 2nd 

 segment of pereopods VI has a sharply stretched posterior distal angle. 

 Pereopods VII have a reduced, three-segmented distal part. 



The urosome is approximately the same length as the last two 

 somites of the pleon together. Uropods I and II have free rami; the 

 endopodite of uropods III is fused with the basipodite. The telson is 

 small and triangular. 



Type species: Tullbergella cuspidata Bovallius, 1887. 



Notes: This genus differs from most other genera of the family Oxy- 

 cephalidae in a thickset body broadened in the thoracic region and a thick 

 integument. These features are evidently associated with the mode of life 

 of Tullbergella which, according to Barnard (1931) live under the bell 

 of medusae. Fage (1960) cites representatives of the genus Hyperia with 

 an analogous shape and identical ecology. 



The genus is monotypic. 



