52 



Proceedings of the Royal Physical Society. 



Upper Cranio-Facial Index 



Cat, . 

 Water Vole, 

 Brown Bear 

 Beaver, 

 Brown Rat, 

 Hedgehog, 

 Fox, , 

 Polar Bear, 

 Tiger, . 

 Llama, 

 Dingo, 

 Thar, . 

 Walrus, 



Pig, . 



Kangaroo, 



Sheep, 



Indian Porcupine 



Horse, 



Hooded Seal, 



Lower Cranio-Faoial Index. 



It does not seem right to attempt to draw any definite 

 conclusions from the indices obtained, as the number of 

 skulls examined is not large, nor are they taken from all 

 the orders of Mammalia. It is necessary that measurements 

 be made of the skulls of most, if not all, mammals before 

 any precise conclusions can be profitably arrived at, or 

 classification of indices made. At the same time, the figures 

 already obtained serve to show that much may be expected 

 from the employment of a systematic method of craniometry 

 in comparative anatomy. 



In order to suggest the kind of facts which may be elicited 

 by an examination of figures such as those given above, the 

 indices of the cat's skull may be taken as an example. 

 These indices show — 



1. That the breadth of the cat's cranium, as compared 

 with its length, is not so great as one might suppose from 

 mere inspection ; the pig has a relatively broader cranium. 



2. That, as compared with the other skulls examined, the 

 distance from basion to bregma is fairly considerable. 



3. On the other hand, the distance between the lambda 

 and the basion is small. The occipital region does not 



