LIST OF FISH. 115 



* Tail without any fin. 

 Anacanthus, Mall. $r Henle, Mag. Nat. Hist. ii. 90, 1838. 



1. UrOGYMN US AFRICAN US. 



Anacanthus africanus, Mull. $• Henle, Plug. 157. 

 Raja africanus, Block, Schneid. 367. 



Hab. — Indian Ocean. 



a. Stuffed. India. Presented by T. E. J. Boileau, Esq. 



b. Stuffed. (Old collection). 



c. Stuffed- Presented by the Zoological Society. 



** Tail with a low, hem-like fin. 

 Urogymnus, Mull. $■ Henle, Mag. Nat. Hist. ii. 90, 1838. 



2. Urogymnus aspereimus. 



Anacanthus asperrimus, Mull. Sr Henle, Plug. 157, 



Eaja asperrima, Block, Schneid. 367. 



Urogymnus, Mull. 8r Henle, Mag. Nat. Hist. N. S. ii. n. 13, 14. 



Hab. — Indian Ocean. 



B. The tail with one or more spines and no Jin, or merely a vertical 

 cuticular hem without rugs. — Pastinacae. 



Trygon (true), Mull. Sr Henle, Mag. Nat. Hist. ii. 90, 1838. 

 Pastinaceae, Mull. &; Henle, Plug. 158. 

 Trygon, Adamson. Cuv. Reg. An. 2 ed. ii. 399. 

 Trijjonhiee, p., Swains. Cab. Cycl. ii. 319. 

 Pastinacas, " of tke Ancients?' 



1. TRYGON. 



The disk is oval or rhomboidal. The tail is of the same length 

 or longer than the body, without a hem, or with hems which do not 

 reach to the other point. The mouth is slightly arched. The teeth 

 have a point or a cross-roll in the middle, which is sometimes 

 uneven, and before and behind the same there are more or less evi- 

 dent transverse furrows, which become more conspicuous on the side 

 of the tooth. The whole upper surface is more or less wrinkled 



