THE INSECTIVOEA. 



453 



is as long as tlie liumerus and the radius togetlier. It is 

 triquetral and possesses an acromial firocess, biit no distinct 

 coracoid. The clavicle, which is revj strong, is perforated 

 by a great foramen, and at the middle of its posterior mar- 

 gin sends off a trancated re-entering process. Proximally, 

 it furnishes an articular surface for the humerus. In the 

 carpus there is a distinct centrale, and a large accessory 

 C-shaped bone lies on its radial side. The pubes are sepa- 

 rate at the symphysis, and an accessory styloid bone is 

 connected with the naviculare of the foot. 



The distribution of the Insectivora is singidar in this 

 respect, that although they are met with, under very various 

 climatal conditions, throughout the Old World and North 

 America, there are none in South America or Australia. 



In the fossil condition they are not certainly known to 

 occur in strata older than the tertiary. 



Fig. 109. 



I 



Fig. 199.— The skeleton of a Flying Fox {Pteropus). 



