17. TKYOOX. 47y 



Variety. Olive-coloured, marbled -n-ith brown. 



a. Half-grown. Presented by Sir A. Smith. 



b. Half-grown : stuffed. Presented by Sir A. Smith. 



14. Trygon kuhlii. 



Miill. 4- Ilenir, p. 1G4, pi. 50; .S(//%. Fau?). Japan. Poi.':/!. p. 308; 

 JBleek. Verh. Hat. Gen. xxiv. Plao. p. 7P> ; Dtaitcril, Elasmohr. 

 p. 003. 



Tail with a distinct cutaneous fold above and below, about one- 

 half longer than the disk. The margins of the snout form an obtuse 

 angle. Body entirely smooth, or with a series of spines, pointing 

 backwards, along the median line of the back to the caudal spine. 

 Only two appendages at the bottom of the mouth, behind the teeth. 

 Upper parts with some scattered bluish black-edged ocelli. 



Indian Ocean and archipelago. 



a, b, c, d, e-f. Adult, half-grown, and young. Zanzibar. Presented 



by Lieut.-Col. Playfair. 

 g, h, i. Half-grown and young. East-Indian archipelago. 



15. Trygon margarita. 



Tail with a distinct cutaneous fold below, but without one above ; 

 it is twice and a half as long as the disk, which is scarcely longer 

 than broad. The anterior margins of the disk would meet at a some- 

 what obtuse angle, but the foremost part of the snout is produced 

 into a short point. Sides of the disk entirely rounded, smooth ; a 

 suujle large round tubercle, like a pearl, in the centre of tJie bad', some- 

 times a trace of a second in front of the large one. Three appendages 

 at the bottom of the mouth, behind the teeth ; another much smaller 

 appendage on each side of the three long middle ones. Uniform 

 brownish above, whitish below. 



West Africa. 



a. Disk 81 inches long, tail 19 inches. Purchased of ilr. J. Wood. 



b. Young. From the Collection of the Zoological Society. 



IG. Trygon rudis. 



Tail with a distinct cutaneous fold below, but without upper ridge, 

 one-half longer tlian the disk, which is considerably broader than 

 long, with very distinct outer angles. Snout somewhat pointed, 

 the anterior profile of tlie disk being concave. All the upper parts 

 and the tail are rough from minute, dense asperities ; there arc no 

 larger tubercles on the body ; but on tlie middle of the tail the ossi- 

 fications arc somewhat larger and with a stellate base. Uniform 

 brown. 



Old Calabar. 



a. Adult female : stuffed ; disk 6| feet broad and 4^ feet long, 

 tail 6 feet (slightly nuitilated). Presented by 0. Nimmo, Esq. 



