OF THE SIVALIK HILLS. 29 



the Cayman. 5. The lachrymal and anterior frontal bones decend lower 

 the Crocodiles than in the Caymans, 6. In the Cayman a part of the 

 vomer is visible in the palate between the maxillaries and intermaxillaries. 

 7. The palatine bones advance more in the palate and are wider in front 

 in the same animal. 8. The posterior nostrils are wider than they are long. 



With regard to the cranial foramina of the fossil, and their proportion 

 relatively to the surrounding bones, we are enabled, by having in our pos- 

 session a very perfect fragment of the occipital region and that portion of 

 the skull bounded by the orbits, to give the comparative measurements 

 here also ; noting that this fossil is a portion of the skull of an animal of 

 much smaller dimensions than that from which the former measurements 

 were taken. 



Length of crotaphile foramina, 



Breadth of ditto, 



Breadth of the frontal bone on its junction with 



lachrymal, 



Ditto on posterior frontals at their junction with 



mastoid bones, , 



Breadth of occipital condyle, ^ 



Ditto of occipital foramen, 



Depth of ditto, ... 



Existing Crocodile. 



Fossil 



11 Feet long. 



7 Feet long. 



Crocodile. 



Inches. 



Metres. 



Inches. 



Metres. 



Inches. 



Metres. 



1.30 

 0.90 



0.032 

 0.022 



0.9 

 0.70 



0.022 

 0.017 



1.40 

 1.0 



036 

 0.026 



1.9 



0.048 



I.l 



0.027 



2.1 



0.053 



4.55 



1.3 



0.9 



0.65 



0.115 

 0.032 

 0.022 

 0.016 



3.0 

 0.9 

 0.7 

 0.45 



0.076 

 0.022 

 0.017 

 0.012 



4.85 

 1.20 

 0.90 

 0.60 



0.122 

 0.031 

 0.022 

 0.015 



It will be observed from the above that the fossil and the existing 



o 



animal of 11 feet very closely correspond in dimensions, although the cro- 

 taphite foramina are rather larger, and the width of the bones in their 

 neighbourhood greater in the fossil than in the existing one. This propor- 

 tional excess of breadth however, is not so striking as in the measurements 

 of the muzzle before given ; although it still bears us out in the general ex- 

 panded dimensions of the fossil animal. 



Of the lower jaw the only comparative measurement that our 

 discoveries have enabled us to make, is of a small portion of the anterior 



H 



