Dr, J. E. Gray on the Mud- Tortoises of India. 337 



There are in the Museum three half-grown specimens, possi- 

 bly of this tortoise, which I mentioned under Trionyx gan- 

 geticus in the Suppl. Cat. Shield Rept. They may be only 

 varieties of the preceding species. 



6. Trionyx ocellatus. 

 Young only known. Callosities not developed ; nose before 

 the eyes with a broad lunate yellow spot. 



Testudo ocellata, B. Hamilton, icon. ined. 



Trionyx ocellatus, Gray, 111. Ind. Zool. tab. (copied from Hamilton). 



Gijmnopus ocellatus, Dumeril & Bibron, Erpet. Gen. iv. p. 9. 



Hah. India (B.M.). 



A young specimen in the British Museum is very like the 

 Trionyx ocellatus of Gray (Illust. Indian Zool. tab. 78), copied 

 from the Testudo ocellatus of Dr. Hamilton's drawings. It 

 chiefly differs in the crown of the head being black and minutely 

 punctate like the rest of the head, instead of being uniformly 

 bluish as in the figure. It is at once known by the broad 

 yellow lunate mark over the nose just before the eyes, and the 

 large yellow spot behind each eye. Dumeril and Bibron regard 

 this as a species under the name of " Qymnopus ocellatus^ 

 Hardwicke ;" and they refer to it Trionyx gangeticus^ Gudrin 

 (Cuvier, E^gne Animal, tab. l.fig- 6), from specimens in the 

 Paris Museum sent home by Duvaucel. This figure is not 

 very characteristic. 



Dumeril and Bibron refer to Trionyx gangeticus^ Cuvier, 

 R^gne Animal, tab. i. fig. 6 ; but the figure does not represent 

 the characters of this species. And they also, curiously enough, 

 refer to Trionyx hurum. They say that there are five speci- 

 mens in the Paris Museum sent by Duvaucel ; but they do not 

 mention the peculiar broad yellow band across the nose, and 

 their specimens may be -only the young of Trionyx gangeticus, 



7. Trionyx Bellii. 



Young only known. Callosities not developed. Upper part 

 of the head black, white-spotted on the crown, with a red spot 

 on the sides of the temple and on the angles of the mouth. 



Trionyx yangeticus, Cuvier, Bell's MS. ; Gray, Tortoises, Terrapins, 

 and Turtles, p. 11, tab. 51. 



Hob. Asia. 



I only know this species from Mr. Bell's figure. It is very 

 like T. ocellatus ; but the nose is black : the back of the crown 

 is not to be seen, as the hearl is partially withdrawn. 



Mr. Bell's specimen is probably in the museum at Cambridge 

 with the rest of his collection. 



