258 



THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



OLACIALIS BONNATERRE. EUROPEAN AND AMERICAN. LENGTH OP FIRST RIB. 



In the majority of specimens the last pair of ribs is much shorter than the 

 penultimate pair, but in the Raleigh Museum skeleton the last left rib is nearly as 

 long as the rib which precedes it. The right rib is shorter. 



STERNUM. 



Among European specimens the sternum appears to have been figured only in 

 the case of the Taranto skeleton and Guldberg's Iceland skeleton No. 1. These 



FIG. 85. FIG. 86. 



BAL&NA OLACIALIS BONNATERRE. STERNUM. 



FIG. 87. 



FIG. 85. TARANTO, ITALY. (FROM GASCO.) FIG. 86. ICELAND. (FROM GULDBERG.) FIG. 87. LONG ID., 

 NEW YORK. (AMER. Mus. NAT. HIST.) (FROM A SKETCH.) 



two sterna (text figs. 85 and 86) show little resemblance to one another at first sight ; 

 nevertheless, it will be perceived that if that of the Taranto skeleton were length- 

 ened posteriorly it would approach that of the Iceland specimen, the form in both 

 cases being rudely heart-shaped. 



1 Whether right or left not specified. 



1 Type of B. cisarctica. 



