501 



coxal plates of the pereopods are fused with the pereon somites. Pere- 

 opods I and II are shorter than the rest, with well-developed chelae. Pere- 

 opods III-IV have thin virgate segments. Pereopods V are the longest; the 

 2nd segment of Pereopods V-VII is broadened, leaf-shaped, but broad- 

 est in pereopods VI. The last pereopods are well developed and equal in 

 length to pereopods III. The urosome is shorter than the pleon. Uropods I 

 are the longest; the endopodites of uropods II and III are fused with the 

 basipodites. The telson is large, triangular, with a pointed tip, and equal 

 to or shorter than the last urosomite. 



Type species: Oxycephalus piscatoris Milne-Edwards, 1830. 



Notes: Page (1960), based on vast material, showed that except 

 for O. longipes (known from a lone specimen) all the remaining Oxy- 

 cephalus could be grouped into three species: O. piscator, O. clausi, and 



0. latiwstris. Of these three species, O. piscator, O. clausi are close to 

 each other morphologically as well as in the presence of dimorphism 

 in females; O. latiwstris differs from them in a more fragile build, 

 smaller body size, and some characteristic morphological details. More- 

 over, dimorphism has not been observed in the females of the last species. 



KEY TO SPECIES OF GENUS OXYCEPHALUS 



1 . Distal part of pereopods VII stylet-shaped, longer than 2nd segment 

 due to highly elongated 6th segment, which is equal to 2nd segment 

 in length 4. O. longipes Spandl. 



— Distal part of pereopods VII not longer than 2nd segment; 6th seg- 

 ment only slightly longer than short 5th segment 2. 



2. Epimeral plates without denticles, chelae with finely serrate orna- 

 mentation 3. O. latirostris Claus. 



— Epimeral plates with denticles, chelae with coarse sparse denticles . . 

 3. 



3. Epimeral plates with one denticle each in lower posterior angle. Fifth 

 segment of pereopods I and II without sharply pointed projections in 

 distal part of anterior margin 1 . O. piscator M.- Edw. 



— Epimeral plates with two denticles in middle of distal margin and in 

 lower posterior angle. Anterior distal part of 5th segment of pere- 

 opods I and II acuminate 2. O. clausi Bov. 



1. Oxycephalus piscator Milne-Edwards, 1830 (Fig. 218) 



Milne-Edwards, 1830: 396; Bovallius, 1890: 56; Stephensen, 1925a: 

 186; Spandl, 1927: 180; Shoemaker, 1945a: 246; Fage, 1960: 14; Pil- 

 lai, 1966: 176. — ornithorhamphus. Cocco, 1832: 205 (Urio). — oceanicus 

 Guerin-M6neville, 1836: 10. — coccoi Natale, 1850: 12 (Ornithorham- 

 phus). — candidissimus Costa, 1864: 88 (Natalius). — bulbosus Streets, 

 1878: 280.— similis Claus, 1879b: 193.— edwardsi Thomson, 1883: 238. 



