THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



235 



AVith the j^roper 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 arteiial foramina a[)pear are as follows: 



MEGAPTERA NODOSA (BONNATERRB). EUROPEAN AXD AMERICAN. CUEVRONS. 



Last neural spine is on vert. No 



Last transverse process is on vert. No. . 



Tay River, 

 Scotland. 



41 

 39 



Vogelsand, 



Germany. 



(Type.) 



42 

 38 



Provincetown, 



Mass. 



U. S. N. M. 



No. 16252. 



40 

 38 



Greenland. 



Brussels Mus. 



No. 269. 



42 

 37 



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 and 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 Eui-opean and American specimens are as 

 follows : 



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



Locality. 



Vogelsand, Germany 



Tay River, Scotland 



Provincetown, Mass. (16252) 

 Cape Cod, Mass. (21942).... 



Coast of Maine 



West Indies 



Greenland (Lund Mus.) 



Breadth. 



Height. 



Remarks. 



Type of Af. longimana. 



Type of M. osphyia. 

 Type of M. bellicosa. 



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

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



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



Left. The right = 33.6 %. 



