CRANIAL MEASUREMENTS* OF Castor canadensis leucodonta FROM VANCOUVER ISLAND, BRITISH COLUMBIA 

 Specimens arranged approximately in order of age from top of table to bottom 

 (All measurements in millimeters) 





*A11 measurements except as below specified taken in accordance with methods given by Taylor, 1911, pp. 206, 207. 



Width of nasals: across both nasals at right angles to the antero-posterior axis of skull, so as to include the most lateral points on their outline. 

 Length of frontals: along interlying suture, or where this is obscure, along median line of skull . 

 Length of interparietal: along median line of skull. 



Length of nasals: measured, not strictly along interlying suture, but so as to include the most a nterior and most posterior points, except where an exceedingly narrow tongue extends posteriorly of main 

 posterior outline of bone. 



