THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 935. 
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: 
MEGAPTERA NODOSA (BONNATERRE). EUROPEAN AND AMERICAN, CHEVRONS. 
; Vogelsand SESE Greenland 
Tay River, eenan D Mass. Bencccls Ma 
Scotland. T ae U.S. N. M. Rea? 
(Ase No. 16252. O:8:209: 
Last neural spine is on vert. No........ 41 Age 40 42 
Last transverse process is on vert. No... 39 38° 38 37 
CHEV RONS. 
My notes on No. 269 from Greenland, in the Brussels Museum, show that 9 
chevrons are in position. The figure of MJegaptera in Van Beneden and Gervais’s 
Ostéographie (pls. 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 pl. 34, fig. 4; pl. 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 European and American specimens are as 
follows : 
MEGAPTERA NODOSA (BONNATERRE). EUROPEAN AND AMERICAN. SCAPULA. 
Locality. Breadth. Height. Remarks. 
% % 
WogelsandaGenmeamyanyerlen\-rayortierts tt Be, I 22.3 Type of AZ. longimana. 
Dagy Rune, SCO eI | acaoeae anon obooue Bete) Deh 
Provincetown, Mass. (16252)........... 30.7 DM 
(Capel CodsMasse (21042) Manes esse ee 31.8 22.6 
Coastrof Maine rapic: sees sas sae ee aie 21.9 Type of JZ. osphyia. 
IWiestendlesta nace ste siviscicrsis sisie ss ne ave Bee 23.1 Type of AZ. bellicosa. 
Greenland (Lund Mus.)..........-.... 31.6 21.4 
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 JZ. longimana. = Lett. Dheiright =)3316 4: 
