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 PHTSALVS AND B. VELIFERA T SKULL. 



The correspondence in ])roportions between the East and West Coast skulls is 

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

 the averai^'-e East Coast specimen. In these respects it is, however, below the ma.xi- 

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



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



Fig. g4. Fi^- 95- I''^- ^ft- 



BALMNOPTERA VELIFERA COPE? CALIFOKNIA. 

 Fig. 94.-SKULL. Fig. qs.-Cervical ..\nd Dors.vl Vertebrae. Fig. 96.-LUMBAR Vertebrae. From 



BELOW. (WiSTAR INSTITUTE, PHILADELPHIA.) 



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

 the maxillaj. This amount {1\ in.) may have been a trifle too great. 



By reference to the measurements of Atlantic skeletons of B. physahis given 

 on paf'e 144, it will be found that the average breadth of the scai)ula is 26.4 % of 

 the \encrth 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 fc and in the California specimen 



