804 



FAUNA ANTIQUA SIVALENSIS. 



identical, without even ranging into varieties, with, the Cro- 

 codilus biporcatus^ and Leptorynchus Gangeticus which now 

 inhabit in countless numbers the rivers of India ; while the 

 Testudinata are represented by the Megalochelys Sivalensis 

 (Nob.),^ a tortoise of enormous dimensions which holds in its 

 order the same rank that the Iguanodon and Megalosaurus do 

 among the Saurians. This huge reptile (the Megalochelys) — 

 certainly the most remarkable of all the animals which the 

 Sewaliks have yielded — from its size carries the imagination 

 back to the era of gigantic Saurians. We have leg bones 

 derived from it, with corresponding fragments of the shell, 

 larger than the bones in the Indian unicomed Rhinoceros ! 



There is, therefore, in the Sewalik fossUs, a mixture in the 

 same formation of the types of all ages, from the existing ujd 

 to that of the chalk ; and all coexistent with Quadrumana. 



P.S. Since the above remarks were put together, we have 

 been led to analyze the character presented by a specimen in 

 our collection which we had conjectured to be quadrumanous. 

 The examination proves it to be so incontestably. The speci- 

 men is represented in fig. 11, A. and B. 



Fig. 11. 



A and B represent the canine of natural size ; at C it has been reduced and 

 placed in position withthelo-wer jawof the Sumatra Oraug-Outang. (The drawing 

 has been copied from one in the ' Journ. As. Soc.,' vol. vi. PL xviii. — Ed.) 



It is the extra-alveolar portion of the left canine of the upper 

 jaw of a very large species. The identification rests upon 

 two vertical facets of wear, one on the anterior surface, the 

 other on the inner and posterior side, and the proof is this. 

 The anterior facet b has been caused by the habitual abrasion 

 of the upper canine agamst the rear surface of the lower one, 



' Crocodilus bombi/rons. See appendix to Memoir on Crocodiles. — [Ed.] 

 * Colossochelys Atlas. — [Ed.] 



