THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 225 
one or two furrows running out of the corner of the mouth and passing backward 
across the root of the pectoral fin. (See pl. 37, fig. 3.) These were sometimes 
limited posteriorly by two or three short furrows running transversely, so that the 
pectoral fin was marked off from the body by an almost continuous depression. In 
one instance there were five or six short furrows across the proximal end of the 
upper surface of the pectoral fin, and also a longitudinal furrow above the eye. 
(See pl. 39, fig. 2.) In none of the five specimens examined (including two fcetuses) 
were these lines exactly alike in detail. Similar lines about the pectoral are shown 
in Sars’s figure of the Finmark specimen (80, pl. 2). 
DERMAL TUBERCLES. 
It is characteristic of the Humpback whales to have a number of hemispherical 
tubercles on the snout and mandible. Those on the snout are arranged in three 
rows, one median and two lateral. The lateral rows are irregular and in each the 
tubercles are arranged somewhat in pairs. On the mandible there is a cluster of 
tubercles on each side of the symphysis and others scattered along the jaw in about 
three irregular rows.’ The tubercles are elongated. In the Newfoundland speci- 
men, No. 5, the larger ones were 43 in. long, 2 in. broad. 
In the Tay River whale there were 7 tubercles in the median line of the snout, 
8 on the right lateral row, and 11 on the left lateral row; on the mandible, 6 on 
each side of the symphysis, and 6 more along each side of the jaw; in all, 26 on the 
upper jaw, 24 on the lower. 
In the Finmark whale a similar arrangement of tubercles is described by Sars: 
a median row, and a double row on each side, The number, size, and shape appear 
to be incorrectly given in his figure (89, pl. 2), which has been copied in the 
Encyclopedia Britannica, 9th ed. (Art. Whale). 
Rawitz (74) states that in the Bear Id. Humpbacks examined by him there 
were 26 tubercles on the upper jaw and from 13-19 on the lower jaw. 
In the Newfoundland specimen No. 6 there were 4 or 5 in the median row on 
the snout, one on the wall of the blowhole, and from 10 to 13 in each lateral row ; 
on the mandible, 5 on each side of the symphysis, and about 12 additional on each 
side of the jaw; making in all from 24 to 31 on the upper jaw, and about 34 on 
the lower jaw. 
In No. 5 (pl. 37, fig. 3) there were about 24 on the upper jaw, and 28 on the 
lower jaw. In No. 21 (pl. 39, fig. 4) there were about 5 large tubercles on each 
side of the symphysis of the mandible, and about 5 smaller ones on each side of the 
jaw. The number on the upper jaw was not observed. 
Kschricht’s figure of the feetal Greenland Humpback shows 5 tubercles in the 
* Rudolphi (76, 135) states that the type of B. Jongimana was without tubercles on the head, 
and the figure which he gives shows this condition. It is not certain by whom this supposed 
character was observed. Rudolphi does not state that he saw the exterior of the specimen. The 
figure was drawn by C. L. Miiller, and shows numerous inaccuracies, among which are the large 
size of the dorsal fin, the curvature of the rostrum, the position of the eye, etc. 
