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



Schlegel, in the ^ Fauna Japonica' (tab. v. fig. 7), represents 

 a head which he calls Trionyx stellatus^ yav. japontcus. The 

 upper surface is pale-coloured, with pale spots on the edge of 

 the lips and sides of the neck, the latter being the largest. At 

 tab. vii. he figures the animal ; but the specimen appears to be 

 bleached. It probably belongs to this genus. 



Landemania. 



1 . Landemania perocellata. 



Trionyx perocellatus, Gray, Cat. Tort. B. M. p. 48 ; Cat. Shield Repf 



p. 65, tab. 31. 

 Potamocheli/s? perocellatvs, Gray, P. Z. S. 1864, p. 86. 

 Landemania ? jierocellata, Gray, P. Z. S. 1869, p. 216 ; Suppl. Cat. Shield 



Kept. p. 96. 



Hah. China, Chusan. 



Trionyx tuberculatus, Cantor's drawings; Gray, P. Z. S. 1861, p. 42. 

 Potamochelys tuherculatus, Gray, P. Z. S. 1864, p. 87 ; Suppl. Cat. Shield 

 Eept. p. 105. 



Hah. Chusan. 



I believe this is the same as the preceding, as is also the 

 half-dried specimen called Landemania irrorata^ Grray, Suppl. 

 Cat. Shield Rept. p. 96, fig. 1 (sternum). They all have a 

 black streak from the back edge of the eye, extending along 

 the upper part of the side of the neck. 



Potamochelys. 



The genus Potamochelys of Fitzinger, as restricted by me in 

 the ' Proceedings of the Zoological Society ' for 1864 and 1869 

 and in the ' Supplement to the Catalogue of Shield Reptiles ' 

 (p. 104, fig. 34), should be erased from the system. The skull 

 figured (which was presented to the museum by Prof. Oldham), 

 now that we have other skulls to compare with it, proves to 

 be the skull of an Emyda^ with the figure of which in Wagler I 

 had compared it when I first described it. The animal de- 

 scribed &•& Potamochelys stellatus proves to be Trionyx gang eticus 

 of Cuvier, having no alliance with T.javanicus of Geoifroy, 

 which is an Aspilus. 



I feel considerable regret but no shame in making this con- 

 fession, when one considers the very imperfect materials I had 

 to work on when I wrote the " Revision of the Species of Tri- 

 onychidge ;" and any person who will follow my papers on the 

 different genera of that family will see the disadvantages under 

 which I laboured, and how I had to feel my way as specimens 

 illustrative of the subject were gradually received. 



