CKOCODILES. 



349 



fossil variety of the C. hiporcatus of Cuvier and the C. porosus 

 of Schneider. 



In taking the numerical proportion of the fossils already 

 found as a guide to that of the animals existing on this tract 

 previous to the upheavement of the line of country, it would 

 appear that the Mastodon and Elej)hant vrere the most 

 numerous. 2. Ruminants. 3. Hippopotamus of varieties, 

 the largest of which, with six incisors {S. Sivalensis), is in 

 the greatest jDroportion. 4. Crocodile, Gharial, and Tortoise. 

 5. Rhinoceros, Hog, and Horse. 6. Carnivora. 7. Fish. 



The remains of Saurian animals, although standing high 

 on this list, consist chiefly of fragments of the osseous plates 

 of the neck, vertebrae, detached teeth, articulating ex- 

 tremities of bones of the arms and legs, as well as other 

 portions of the skeleton; while portions of the head have 

 been rarely found. Those referred to in this note are very 

 perfect ; others are crushed and distorted ; but the leading 

 differences which have been adverted to are fairly marked in 

 all those that have come under my observation. 



There appears to be a local disposition in the deposits of 

 these remains, as would be natural to expect on a varied 

 surface of plain, forest, and marsh. The Mastodons, Ele- 

 phants, &c., in great abundance at some points, give place 

 to the Hippopotami and Saurian reptiles in others. At many 

 places the latter, with the Tortoise, are totally wanting ; at 

 others, as in a stratum of an impure marl attached to this upper 

 series where freshwater shells (chiefly like the Unio of the 

 present day) were found in great abmidance, nearly the 

 whole of the remains accompanying them were those of the 

 Crocodile and Gharial. In considering the length of the 

 fossil species we see no signs of anything beyond that of the 

 animal now existing. The largest remain in our possession 

 is a vertebra, which is one-third larger than that figured in 

 the London Geological Society's ' Transactions ' amongst the 

 Ava fossils, and described as the remain of an enormous 

 animal ; the vertebra above mentioned is either one of the 

 dorsal or lumbar, but the processes are broken and imperfect. 

 The dimensions of the barrel or cylinder in this specimen, 

 and the measurements of the third lumbar vertebra of the 

 existing Crocodile, are here given :— 



