500 



2. Rami of all uropods free 3. 



— Endopodites of uropods III or of II and III fused with basipodites . . 

 5. 



3. All coxal plates separated from pereon 2. Streetsia Stebb. 



— All coxal plates or some of them fused with corresponding pereon 

 somites 4. 



4. All coxal plates fused with pereon. Body thickset, with dense, 

 often highly calcinated integument. Pereopods I with subchela, 

 pereopods II with chela 7. Cranocephalus Bov. 



— Coxal plates of pereopods VII fused with pereon, other plates free. 



Body thin, transparent. Pereopods I and II with chelae 



6. Glossocephalus Bov. 



5. Head longer than pereon. Geminate urosomite 3-4 times longer than 

 urosomite 1 6. 



— Head shorter than pereon. Geminate urosomite less than 2 times 

 length of urosomite I 7. 



6. Rostrum proximally with broad lateral keels. Coxal plates fused with 

 pereon. Second segment of pereopods VII elongate, approximately 

 same length as distal part of leg 4. Calamorhynchus Streets. 



— Rostrum without lateral keels. Coxal plates separate from pereon 

 somites. Second segment of pereopods VII roundish, equal in length 



and width, and much exceeds length of distal part of leg 



3. Leptocotis Streets. 



7. Coxal plates fused with pereon. Pereopods I and II with chelae; 

 pereopods VII well developed. Second segment equal to or slightly 



shorter than five-segmented distal part of leg 



1 . Oxycephalus M.-Edw. 



— Coxal plates separate from pereon somites. Pereopods I and II 

 with subchelae; pereopods VII small, reaching only middle of 2nd 

 segmented of preceding pair. Second segment twice as long as 

 three-segmented distal part of leg 5. Tullbergella Bov. 



1. Genus Oxycephalus Milne-Edwards, 1830 



Milne-Edwards, 1830: 396; Stebbing, 1888: 1576; Bovallius, 1890: 54; 

 Stephensen, 1925a: 186; Spandl, 1927: 179; Fage, 1960: 29; Pil- 

 lai, 1966: 173; Bowman and Gruner, 1973: 49.— Orio Cocco, 

 1832: 205.— Ornithorhamphus Natale, 1850: 12.— Natalius Costa, 

 1864: 88. 



The body is elongate. The head is shorter than the pereon, bulged, 



smoothly terminating in pointed rostrum that constitutes about 1/3 the 



405 head length; the maximum height of the head is more than the height 



of somite I of the pereon; the posterior part of the head forms a short 



neck. The pereon is equal to or somewhat longer than the pleon. The 



