92 Sir P. Egerton on Fossil Fishes from Southern India. 



Ganoid Order. 



Pycnodont Family. 



Sphcsrodus rugulosus, Eg. — All the tritoral teeth in the Indian collections appear 

 to belong to one species of the genus Sphaerodus. A pretty group in 

 Mr, Kaye's series shows nine teeth in situ of those in use, and under- ^^p O 

 neath there are the germs of several .of their successors. Three de- 

 tached teeth appear to have belonged to the same specimen. In Mr. Cunhffe's 

 collection I have found two tritores, considerably larger than the specimens alluded 

 to above, but evidently belonging to the same species. In size these teeth resem- 

 ble those of Sph(Brodus lens, the smallest species figured by Agassiz ; in regularity 

 of form they approach nearer to Sphcp/rodus parvus ; but they are distinguished from 

 these species and all others figured by Agassiz by the wrinkled or shrivelled ap- 

 pearance of the superficies of the teeth. This is visible even in the smallest spe- 

 cimens, and forms a well-marked and easily appreciable specific character. 



Placoid Order. 



Squaloid Family. 



Corax pristodontus, Agass. Poiss. Foss, vol. iii p. 224. — A single fragment is 

 the only evidence upon which rests the supposition that this species ^^ 

 enjoyed the extended geographical range indicated by its occurrence f^ ''■ 



in the Cretaceous system of Europe and India. This specimen shows 

 the outer surface of the hinder portion of a sinistral tooth. The base 

 is wanting. It corresponds in minutest detail with the analogous portions of a 

 tooth received from Professor Goldfuss, named by Agassiz Galeus (now Corax) 

 pristodontus, apparently from the Maestricht beds. A comparison with the figures 

 given in the ' Poissons Fossiles' yields a like result. Some specimens in Mr. 

 Lyell's cabinet, from the chalk of North America, approximate very closely to this 

 species. Should they be identical, it will prove this to be one of the most widely 

 distributed fossil forms of fishes with which we are acquainted. 



Corax incisus, Eg. — A second species of Corax occurs in the Indian collection 

 sent over by Mr. Cunliflfe, of small size and very distinct character. It is ^ 

 rather smaller than the species of this genus generally are, corresponding ^J 

 in this respect with Corax planus, of which some imperfect specimens are 

 figured in the 'Poissons Fossiles' from an unknown locality. Our specimens are 

 not perfect, but they are sufficiently so to prove them to be specifically distinct from 



