510 Zoologicnl Proceedings of Societies. 



Of a small species of Hippopotamus, 2. 



Of the Hog ; 1 ; and of the Ox, Deer, and Antelope, about 20. 



Of the Gavial and Alligator, about 50. 



Of the Ermjs, 20 ; and Trionyx, 10. 



One fragment of Emys is so large, that the animal of which it formed 

 a part, must have been several feet in vs'idth. 



The state of preservation of these bones is very perfect, from their be- 

 ing penetrated with hydrate of iron, and thereby rendered strong. Not 

 one of them is silicified, though they have been erroneously stated to be 

 so, in some of the periodical journals. 



The district in which they were found is a little north of the town of 

 Wetraasut, and is composed of barren sand-hills and beds of gravel in- 

 tersected by ravines, and cemented occasionally into a breccia by carbo- 

 nate of lime, and sometimes by hydrate of iron. Over the surface of 

 these hills were scattered the fragments of bones and wood, some quite 

 naked and loose, others half buried in the sand and gravel. Many frag- 

 ments of wood lay also at the bottom of the ravines. About one-third 

 of the bones have been slightly rolled ; and the rest had all been broken 

 before they were lodged in the places where Mr. Crawfurd found them, 

 and where they appear to have been dispersed and buried, by the action 

 of the same waters that produced the diluvial sand and gravel, whence 

 they have since been washed out, and left bare by the action of rains and 

 torrents. 



Concretions of sand and gravel adhere to many of the bones, but they 

 contain no traces of shells, and differ mineralogically from all the rock 

 specimens in this collection, which we recognize as belonging to tertiary 

 and freshwater strata. 



Indications of freshwater formation were found in one spot only, not 

 far from the fossil bones, and they consist of a marly blue clay, abound- 

 ing with shells of a large and thick species of Cyrena. 



The tertiary rocks are : 1st, a dark slaty limestone, containing many 

 shells that have been identified by Mr. Sowerby with those of the Lon- 

 don clay; 2nd, a yellow sandy limestone containing shells, and resem- 

 bhng the calcaire grassier; and 3rd, a soft greenish sandstone resembling 

 the sandy beds of our plastic clay formation. 



This London clay and calcaire grassier afford an additional locality of 



