472 TBTOONID^. 



Anacantlius asperrinius, Midi, fy Jlenle, p. 157. 



africanus, Miill. Sf Henle, p. 157. 



Rhachinotua africanus, Cantor, Mai. Fish. p. 422; Bleek. A at. Tijds. 



Ned. Ind. 1853, iv. p. 04. 

 Urogvmnus asperrinius, Dumiril, Elasmobr. p. 580. 



africanus, Ihaneril, I. c. p. 581. 



The dorsal surface of the head and trunk and the tail are densely 

 covered with osseous tubercles, between which larger erect conical 

 thorns are scattered ; the pectoral fins without the small tubercles, 

 but with numerous large thorns, each standing on a circular base. 



Indian Ocean ; Pinang. 

 a. Adult female : stuffed (body 4 feet long). India. Presented by 



T. E. C. Boileau, Esq. 

 h. Adult female : stuffed. Pinang. From Dr. Cantor's Collection, 

 c. Adult female : stuffed. African coast. 

 d-f. Adult females : skins. 

 y. Adult : skeleton. Seychelles. Presented by Swinbui-ne Ward, 



Esq. 

 h. Tail of a large example. 



16. ELLIPESURUS. 

 Elipesurus, Schomhuryk, Fish. Brit. Guian. ii. p. 184. 

 Tail short, very distinct from the subcircular disk, without fin 

 but with strong bony, spinous excrescences round the basal portion. 



1. Ellipesurus spinicauda. 



Schombin-gk, I. c. p. 184, pi. 23. 

 Bright ochrcous yellow, reticulated with darker. 

 llio Branco, near Fort San Joaquim. 



17. TRYGON*. 



Trvgon, Adatufon, Cours d'llist. Nat. ii. p. 170. 

 Himantura, Midi. §• Hcde, Wieym. Arch. 1837, p. 400. 

 Ilemitrygon, Midi. Sf Henle, Ann. Sf Mag. Nat. Hist. 1838, ii. p. 90. 

 Trygon e/. Ilypolopbus, Midi. ^- Henle, Plagiost. 

 Himantura, Paiatrygon, Ilemitrygon, Trygon et Ilypolophus, Du- 

 meril, Flasmobr. pp. 582, 583. 



Tail long, tapering, without any fin, or with cutaneous folds not 

 extending to its extremity ; it is armed with a long arrow-shaped 



* 1. Trygon purpurea, M. 4' H. p. 160, taf. 51. — South Africa. — Known from 

 a drawing. 



2. Jabcbirete, Marrqr. p. 175 ; Eaja guttata, Bl. Schn. p. 3GI ; Trygon jabe- 



bara, M /i/. p. ino. 



3. Trygon spinosissima, DitmSril, Elasmobr. p. 508,- — a name given by this 



author to a mutilated tail in the Paris Museum, said to belong to a 



species allied to T. thalassia. 

 4. atrocissimus, Bb/fh. Joitrn. As. Soc. Beng. 1860, p. 39, is another 



name given to a tail of the same or a simihir species. 

 .'}. marginatus, Bli/th, Journ. As. Soc. Beng. 1860, p. 38. — Bengal. 



