186 



THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



J., specimen, and of a scapula which I photographed at Balena whaling station, are 

 shown in the accompanying text figures 45 to 48. See also pi. 7, figs. 5 and 6. 



FIG. 45. 



FIG. 46. 



FIG. 47. 



FIG. 48. 



SCAPULA OF BALMNOPTERA MUSCULUS (L.). 



FIG. 45. OSTEND, BELGIUM. AD. S. (FROM DUBAR.) FIG. 46. SWEDEN. (FROM VAN BENEDEN AND GERVAIS.) 



FIG. 47. BALENA STATION, NEWFOUNDLAND. AD. (FROM A PHOTOGRAPH.) FIG. 48. OCEAN CITY, 



NEW JERSEY. IM. 9 . (FROM A PHOTOGRAPH.) 



These figures show the strongly projecting anterior and posterior borders, 

 evenly convex superior border, and large acromion, characteristic of the Sulphurbot- 

 toms. What the range of variation in form may be in European and American 

 specimens, and whether specific differences could be detected, cannot of course be 

 determined at present for lack of material. It is to be expected that considerable 

 individual variation will be found, and this is indicated in the two figures of scapulae 

 from American specimens, which while agreeing in general form, show differences 

 in detail. 



The dimensions of scapula? in different specimens and the proportion of the 

 breadth to the height in the same are shown in the table on p. 187. The discrep- 

 ancy in proportions, amounting to about 4 per cent., I am unable to account for. It 

 affects both the American and European specimens and is not, apparently, due to 

 difference in age or sex. The diameter of the glenoid fossa in the scapula of the 

 Ocean City skeleton is 13 in. by 9 in. ; the greatest length of the acromiou is 16 in. 



