THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 2038 
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 BL. 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- 
eheda, 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. Fic. 56. 
BALA{NOPTERA ACUTO-ROSTRATA LAC. EUROPEAN AND AMERICAN. SCAPULA. 
Fic. 53.—Norway. Ap, (From EscuricutT.) Fic. 54.—HArwicHport, Mass. IM. (FROM A PHOTO.) Fic, 
55.—Norway. Ap. (FROM A PHOTO.) Fic, 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: 
