TESTmnNiDjs. 75 



and is of the depressed form of T. emys, while the limbs were 

 covered with dermal ossicles as in the latter and the present species. 



Since there is no evidence that the whole of the bones referred 

 by Falconer to this species really belong to it, it will be convenient 

 to take the epiplastrals, No. 40603, as the real type. From the 

 large size of the undermentioned nuchal it is, however, probable 

 that that specimen is rightly referred to this species; but the 

 reference of some of the other specimens mentioned below must be 

 regarded as provisional. 



Several of the undermentioned specimens were employed by 

 Falconer as models in the construction of the plaster restoration of 

 the shell exhibited in the reptile gallery. The length of the 

 carapace as thus restored exceeds eight feet, but, as will be shown 

 below, both the length and breadth of this restoration are too 

 large 1 . 



The nearest approximation to the remarkable development of the 

 epiplastrals of this species to be met with among existing forms is 

 found in the genus Cinyxis, where the cornua of the male are 

 usually more produced than in the female, although there is great 

 individual variation. 



Hab. India (Siwalik Hills). 



The following specimens were obtained from the Pliocene of 

 the Siwalik Hills. 



R. 326 a. The nearly entire nuchal bone, with a small fragment of 

 the first marginal of the left side and a larger fragment 

 of that of the right side still attached. This specimen, 

 which may be regarded as one of the types, shows the 

 absence of a nuchal shield. The length of its anterior 

 border is 0,278 (11 inches) against 0,234 (9-2 inches) 

 in T. elephantina. The antero-posterior diameter must 

 however, have been proportionately much greater than in 

 the nuchal of the latter. 



Transferred from the Indian Museum, 1880. 



16903. The 1st and 2nd marginals of the left side. Two of the 

 types. These bones have their two diameters nearly 

 equal, and the sulcus dividing the costal and marginal 

 shields placed considerably below their upper border, in 

 both which respects they resemble T. radiata, and differ 



1 In the published notices by Falconer and Cautley the length of the carapace 

 was estimated at more than 12 feet. See ' Palagontologia Indica,' ser. 10, 

 vol. hi. p. 160, note 1. 



