TRYOONID^. 471 



1. PlatjrrMna sinensis. 



Raja chinensis, Lac6p. i. pp. 34, 157, pi. 2. fig. 2. 

 Khina sinensis, HI. Schn. p. ?A2. 



Platyrliina sinensis, Midi. &• Ilenle, p. 125, taf. 43 ; Dumiril, Elasmohr. 

 p. 576. 



Disk subcircular ; snout entirely rounded ; tail longer than the 

 disk. Length of the nostril equal to the distance between the 

 nostrils. A row of spines along the median line of the back and 

 tail ; two pairs of spines on each side of the shoulder ; some spines 

 at the eyes. 



China and Japan. 



a. Young male. China. 



2. Platjrrhina schonleinii. 

 3riiU. 8r Hmle, p. 125, taf. 44. 



Disk subcircular ; snout obtuse ; tail as long as the disk. Length 

 of the nostril one-half of the distance between the nostrils. A row 

 of spines along the median line of the back and tail ; another row 

 along the root of the pectoral fins. Three spines, one behind the 

 other, on each side of the shoulder. Brown, with darker cross bonds 

 and large dark spots. {M. Sf IT.) 



India. 



Fam. 5. TRYGONID^E. 



The pectoral fins are uninterruptedly continued to 

 and confluent at the extremity of the snout. Tail 

 long and slender, without lateral longitudinal folds ; 

 vertical fins none, or imperfectly developed, often re- 

 placed by a strong serrated spine. 



15. UROGYMNUS. 



Urogyninus, Miill. ^ Henle, Wiegm. Arch. 1837, p. 434. 

 Anacanthus, Ehrcnherg. 

 llliachinotus, Cantor. 



Tail long, very distinct from the subcircular or elliptic disk, with- 

 out fin or spine, sometimes with a narrow cutaneous fold below. 

 Body densely covered with osseous tubercles. Pectorals united in 

 front. Teeth flattened. 



Indian Ocean. 



1. Urogyinnus asperrimus. 



Raja asperrima, lil. Sclni. p. o()7. 

 africana, IH. Schn. p. 3(57. 



