THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIO. 229 
In both Eschricht’s figure of the Greenland Humpback (37, pl. 3, fig. 4) and 
Struthers’s figure of the Tay River whale (87, pl. 3, fig. 6), there are 10 anterior 
tubercles, one for the carpus, or distal end of the radius, 3 for the 2d digit, and 
6 for the 3d digit. 
There were exactly the same number and the same arrangement in the New- 
foundland adults and in the foetus taken from Newfoundland specimen No. 21. 
In the fcetus from Newfoundland specimen No. 6, there are 11 projections, with the 
same arrangement,—7. ¢, one large proximal one, then 2 moderate-sized, then one 
large, and finally 7 small, including the tip of the fin. 
Eschricht’s figure of the foetus of the Aeporkak, or Greenland Humpback, 
shows 8 small protuberances at the extreme distal end of the posterior, or ulnar, 
margin of the pectoral. The foetus of Newfoundland specimen No, 21 has the same 
number. In addition there are two large elevations near this margin (which can 
hardly be compared with those on the anterior margin), one opposite the pisiform 
cartilage, or the distal end of the ulna, and one at the distal end of the 5th digit. 
These are not represented in Eschricht’s figure. 
The protuberances of the anterior, or radial, margin and those at the end of the 
ulnar margin are preserved in the adult, and give the fin its remarkable outline. In 
most specimens each protuberance is occupied by a cluster of barnacles. The clus- 
ters are often confluent on both sides of the distal extremity of the fin, forming a 
continuous edging. They are always surrounded by black. The proximal two 
thirds of the posterior margin of the fin is nearly free of barnacles. This margin 
presents a sigmoid curve, convex proximally, concave distally, with the tip directed 
backward. Except at the distal end, this margin is even and thin, contrasting 
strongly with the thick, sinuous anterior margin. 
The same peculiarities are seen in the Tay River (Scotland) whale, Sars’s Fin- 
mark specimen, and Eschricht’s Greenland specimen, and in the young female 
from Cape Cod, Mass., in the National Museum (pl. 41, fig. 6). 
In four European Humpbacks, as seen by examining the table on p. 223, the 
pectoral fin, measured from the head of the humerus, bore the following proportion 
to the total length : 
Bima aks ce eeretatersveyore s.scsievore iste ZOLOAE Me nyuets satis GE Slale a ete Cocks 
IREIBMNG | oagomdoood oaceouadbS oo BUG Dectaysistris bic’ eeyevorea stele Warren 
any Rune SoWvenaGl Gohooosonas BORG itstecctcie\eceete ole ierara sis Struthers 
DecrRiviers En clanderrterttr lier EB NOM Det ereenesnoaersnetee ona Moore 
Rawitz gives the following as the relative length in four Humpbacks measured 
by him at Bear Id. (74, 82): 
(1) 35.7 %; (2) 89.3 %; (8) 81.7 %; (4) 35.3 % 
In the three Newfoundland Humpbacks which I measured the proportion was 
as follows: 
(1) 80.3 %; (2) 83.4%; (3) 33.6 %. 
It thus appears that there is a very considerable variation in the length of the 
pectoral fin in both European and American Humpbacks. Rawitz’s largest meas- 
urements are larger than any others I have found. 
