TRYOONID^. 471 



1. Platyrhina sinensis. 



Raja cliinensis, Lacip. i. pp. :J4, 157, pi. 2. iig. 2. 

 Khina sinensis, Bl. Schn. p. ^.j2. 



Platyrliina sinensis, Mull. &• Hcnle, p. 125, taf. 43 ; Dutniril, Elasmobr. 

 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 aloTig 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. Platyrhina schonleinii. 



3rull. 4- Henle, 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 shoidder. Brown, with darker cross bands 

 and large dark spots. {M. Sf 11.) 



India. 



Fam. 6. TRYGONID^. 



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. 



Urogymnus, Miill. ^- Henle, Wieijm. Arch. 1837, p. 434. 

 Anacantlius, Ehrcnherg. 

 Hhachinotus, Canfur. 

 Tail long, very distinct from the subcircxilar 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. Urogymnus asperrimus. 



IJaja aspcrrinia, III. Sr/i/i. ]>. ;>ti7. 

 africana, JJl. 6'c7in. p. oi>7. 



