THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



281 



In the following table the measurements of the skull are reduced to percentages 

 of its total length and compared with the average measurements of American 

 B. physalus already given (p. 133) : 



BALMNOPTERA PHYSALUS AND B. VELIFERA f SKULL. 



The correspondence in proportions between the East and West Coast skulls is 

 close, except that the California skull has a somewhat longer and broader beak than 

 the average East Coast specimen. In these respects it is, however, below the maxi- 

 mum of B.physalus, as will be seen by consulting the table on p. 133. 



It should be stated also that as the premaxillse were not in place in the Cali- 



FIG. 94. FIG. 95. 



BALMNOPTERA VELIFERA COPE? CALIFORNIA. 



F.IG. 96. 



FIG. 94. SKULL. FIG. 95. CERVICAL AND DORSAL VERTEBRAE. FIG. 96. LUMBAR VERTEBRA. FROM 

 BELOW. (WlSTAR INSTITUTE, PHILADELPHIA.) 



fornia skull when measured, an allowance had to be made for their extension beyond 

 the maxillae. This amount (7| in.) may have been a trifle too great. 



By reference to the measurements of Atlantic skeletons of JS. pJiysalus given 

 on page 144, it will be found that the average breadth of the scapula is 26.4 % of 

 the length of the skull, while in the California skeleton it is 26.0 %; the average 

 depth of the scapula in the Atlantic skeletons is 15.9$ and in the California specimen 



