23. RHINOPTERA. 493 



e. Adult. Sumatra. From the Collection of Sir S. Raffles. 



f. Half-grown : stuffed. India. Presented by T. C. Jerdon, Esq. 



g. Half-grown. Seychelles. Presented by Lieut. -Col. Playfair. — 



Lower teeth angularly bent. 



h. Half-grown. Seychelles. From the Collection of Prof. Perceval 

 Wright. — Lower teeth nearly straight ; otherwise perfectly iden- 

 tical with the preceding specimen. 



i. Half-grown. From the Collection of the Zoological Society. 



1c. Adult : stuffed. 



I. Tail of a very large example, with four spines. 



m. Tail of a very large example, with five spines. Seychelles. Pre- 

 sented by S. Ward, Esq. 



n. Jaws of a very large example, Seychelles. Presented by S. 

 Ward, Esq. 



o-p. Dental laminae. 



23. RHINOPTERA*. 



Rhiuoptera, KiM. 



Rhinoptera, Mylorhina et Micromesus, Gill, Ann. Lye. Nat. Hist. New 

 rorA:,viii. p. 136. 



Head free from the pectoral fin, but provided with a pair of rayed 

 appendages situated at the lower side of the snout. Nasal valves 

 confluent into a broad flap with free margin. Teeth broad, flat, 

 tessellated, in five or more series, the middle being the broadest, and 

 the others decreasing in width outwards. Tail very slender, with a 

 dorsal fin before the serrated spine. 



Tropical and subtropical seas. 



1. Rhinoptera marginata. 



Rhiuoptera marginata, Cuv. Rigne An. ; Midi. 8( Henle, p. 181 ; Du- 



mSril, Elaftmobr. p. 645. 

 Myliobatis marginata, Geoff r. St.-Hilaire, Descr. Eg. Poiss. p. 220, 



pi. 25. figs. 3 & 4. 



Nine rows of teeth in each jaw, those of the middle series thrice as 

 broad as long. The dorsal fin commences above the end of the root 

 of the ventrals. Tail not quite twice as long as the body. 



Mediterranean. 



a. From Prof. Kdlliker's Collection. 



2. Rhinoptera jussieiii. 



Jussieu, Me?7i. Ac. Sc. 1723, p. 75, pi. 4. fig-. 12 ; Oiivn, Odontoqr. 



pi. 25. fig. 2. 

 Myliobatis jussieui, Cuv. Regno Aii. 

 Rhinoptera brasiliensis, Miill. Ahhaiidl. Ak. IFiss. Berl. 1836, p. 237, 



pi. 9. fig. 12 ; Miill. ^ Henle, p. 182 ; Dumeril, Elasmobr. p. 646. 

 Zygobatis j ussieui, Agass. Pois,s. Foss. iii. pp. 70, 328, pi. J), tig. 8. 



Nine rows of teeth in each jaw, those of the middle series being 



* 1. Rhinoptera peli, Blce/c. Nat. Verh. HoU. Mauhch. Wet. Haarlem. 18(>;{. 

 Guinfe, p. 18, tab. 1. — West Africa. 



