THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



203 



epiphyses were included in the measurement, and the importance of the difference 

 cannot, therefore, be determined. Capellini's figure and measurements (which are 

 not precisely stated) appear to show that the length of the radius, with the epiphysis, 

 was between 21.4$ and 21.8$ of the length of the skull in that specimen. 



SCAPULA. 



The scapula of B. acuto-rostrata is not especially characteristic. It presents 

 almost the same outlines as those of the scapula of B. musculus (L.), though of 

 course it is much smaller. The posterior portion of the superior margin is some- 

 what more sharply bent downward than in B. musculus, and the acromion is long 

 and somewhat recurved at the tip. Carte and Macalister's specimen from Dro- 

 gheda, Ireland, is the only one young enough for comparison with the Massachusetts 

 skeleton. In the former the breadth of the scapula is 31.8% the length of the 

 skull, and its depth 20.3 %, while in the latter the breadth is 33.9 % and the depth 

 20.7 %. 



FIG. 53. 



FIG. 54. 



FIG. 55. FIG. 56. 



BALMNOPTERA ACUTO-ROSTRATA LAC. EUROPEAN AND AMERICAN. SCAPULA. 



FIG. 53. NORWAY. AD. (FROM ESCHRICHT.) FIG. 54. HARWICHPORT, MASS. IM. (FROM A PHOTO.) FIG. 

 55. NORWAY. AD. (FROM A PHOTO.) FIG. 56. NORWAY. (FROM VAN BENEDEN AND GERVAIS.) 



If the various specimens in the foregoing table (p. 202) are arranged according 

 to the length of the skull, it will be seen that the percentage of the breadth of the 

 scapula rises as the size of the skull increases. This is, of course, to be expected, 

 but it prevents direct comparison of young with adult specimens. The percentages 

 are as follows : 



