and of other Animals, found on the left Bank of the Irawadi. Sib 



ciently defined to enable us to characterize the different species, which however 

 must have been very large, and appear to have been not less than three. 



Emys. — There are some fragments of a species, apparently of this genus. 

 One, which is part of the sternum, indicates an animal of enormous size*. 



SAURIA. 



Fam. Crocodilid^. 



Of this family we have the remains of two genera ; a Leptorhynchus, allied 

 to, if not identical with, the great gavial (Lacerta Gangetica Gm.), and a cro- 

 codile resembling Crocodilus vulgaris. Of the former we have portions of the 

 lower jaw, and several vertebrae. Of the latter we have vertebrae, and the 

 anterior termination of the lower jaw, which must have belonged to a very 

 large individual f. 



It is worthy of remark, that most of the bones do not appear to have under- 

 gone any mineral change, with the exception of being abundantly penetrated 

 with hydrate of iron, and that they are very brittle. This last circumstance, 

 arising from the loss of their animal gluten, indicates that they are of great 

 antiquity, and that they have not been imbedded in any very compact soil. 



The teeth of the mastodon from the banks of the Ohio, which lie in a 

 strong blue clay, have almost as much animal matter as we should expect to 

 find in a recent tooth. 



The bones which form the subject of this memoir are almost in every 

 instance fractured ; and the fracture, — from its direction and cleanness, the 

 sharpness of its edges, and the firm texture of some of the bones, — appears to 

 have been produced by a very great power operating with sudden violence. 



It may not be deemed irrelevant, in closing this imperfect catalogue, to 

 observe, that the remains before us indicate the existence of animals which 

 could only have found subsistence in vast forests or widely extended plains, 

 — in marshes, or deep and broad rivers. But the writer of this memoir feels 

 it necessary only to advert to this subject, leaving the state of the globe at 

 the time of their existence, and the period and cause of their destruction, to 

 be discussed by those who are more competent to pursue so interesting an 

 inquiry. 



* Plate XLII. See the recent species of these genera described by Geoffroy, Ann. du Museum, 

 torn. xiv. p. 11 — 20 ; and their habits by Cuvier, Regne Animal, tom. il. p. 10. 15. For the fossil 

 species, see Cuvier, Ossem. Foss. tom. iii. p. 329 ; and tom, v. p. 322. f See Plate XLIII. 



