47 



— Body narrow, elongated, sometimes acicular. Head elongated, pro- 

 duced into tapering, sometimes very long rostrum anterior to eyes. . . 

 XXI. Family Oxycephalidae Bate. 



19. Pereopods VII seven- articled. Mandibular palps in females or in both 

 sexes absent 20. 



— Pereopods VII reduced; distal articles rudimentary, not more than 



two. Mandibular palps present in both sexes 



XVI. Family Pronoidae Claus. 



20. Antennae II in females rudimentary or absent. Mandibles in males 

 with palps 21. 



— Antennae II in females present, short, with few articles. Mandibular 



palps absent in both sexes 



XVII. Family Anapronoidae Bow. and Grun. 



21. Pereopods II with somewhat developed subchela. Claws of pereopods 

 II not armed 22. 



— Pereopods II simple, surface of claws of pereopods II with numerous 

 fine setae XIX. Family Tryphanidae Bov. 



22. Pereopods I with strong dentate subchela. Pereopods V-VI differ little 



in length. Rami of all uropods free 



XX. Family Brachyscelidae Steph. 



— Pereopods I simple or with smooth subchela. Pereopods V longer 

 than others. Endopodites of uropods III or II and III fused with 

 basipodites XVIII. Family Lycaeidae Claus. 



Infi-aorder PHYSOSOMATA Pirlot, 1929 



Hyperiideans in the adult stage of growth resemble "physosoma" in 

 body shape and are characterized by a spherically bulging pereon, and 

 weak pleon and urosoma. In adult hyperiidean Physosomata (dorsal 

 view), the pereon is always broader than the pleon; in some families 

 the adults {especially females) have a spherically inflated pereon. The 

 43 pereon somites are free and only in some genera of the family Scinidae 

 are somites I and II sometimes fused. The head is weakly differentiated, 

 short, usually not longer than pereon somite I, with protruding mouth 

 cone. The eyes are small, weakly pigmented, reduced, sometimes incon- 

 spicuous; only in some species do the eyes retain the crystalline lens but 

 even in these the optical elements are fewer. Antennae I have a short, 

 one- to three-segmented peduncle, large conical proximal segment of the 

 flagellum, and three small distal segments', which may be fused, and 

 sometimes retained only in the juvenile stages (family Scinidae). Anten- 

 nae II in males are usually well developed, in females often rudimentary. 



In the aberrant Paralanceola anomala, there are, apparently, two distal segments. 



