THE WHALEBONE WHALES OF THE WESTERN NOETH ATLANTIC. 



235 



With the proper allowance for difference in age, the specimens show a corre- 

 spondence indicative of specific identity. The positions in the column at which the 

 various processes become obsolete and the arterial foramina appear are as follows : 



MEOAPTERA NODOSA (BONNATERRE). EUROPEAN AND AMERICAN. CHEVRONS. 



CHEVRONS. 



My notes on No. 269 from Greenland, in the Brussels Museum, show that 9 

 chevrons are in position. The figure of Megaptera in Van Beneden and Gervais's 

 Osteographie (pis. 10, 11, fig. 1) shows 12 chevrons. The young specimen from 

 Cape Cod, in the U. S. National Museum, No. 16252, has 9 chevrons. The Tay 

 River (Scotland) specimen had 10 chevrons. 



SCAPULA. 



The scapula of Megaptera is peculiar on account of its evenly convex superior 

 border and the rudimentary condition of the acromion and coracoid processes. 

 (See text figs. 73-78 and pi. 34, fig. 4 ; pi. 36, figs. 3-5.) 



The percentages of the antero-posterior breadth #nd of the vertical height 

 (from the margin of the glenoid cavity to the middle of the superior margin) to 

 the length of the skull in various European and American specimens are as 

 follows : 



MEOAPTEKA NODOSA (BONNATERRE). EUROPEAN AND AMERICAN. SCAPULA. 



Arranging the measurements of breadth of scapula according to the length of 

 the skull, without reference to locality, we have the following : 



1 From Rudolphi's figure. Type of M. longimana. 



Left. The right = 33.6 



