THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



BALJENOPTERA PHYSALUS (L.). EUROPEAN AND AMERICAN. SKULL. 



133 



BALJENOPTERA PHYSALUS (I..). EUROPEAN AND AMERICAN. SKULL. 



The agreement shown in the foregoing measurements is very close except in the 

 case of the breadth across the squamosals. In regard to this measurement, it must 

 be said that in all specimens of the several species of Bolcenopt&i'a it exhibits a 

 considerable range of variation, indicative in part of a real individual variation of 

 considerable extent, and in part, no doubt, to changes in the skulls in drying. 



1 7.5 in. added for premaxillge. 4 Least = 5.5 %. 



2 Squamosals peculiarly broad. See Flower. 5 " =7.2^. 



3 Least = 6.9$. 8 " =7.2$. 



7 Least = 7. 2 jf. 



8 To post, curved margin of maxilla. 



9 Number of specimens ; the California 

 skull is not included. 



