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 pi. 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 pi. 39, fig. 2.) In none of the five specimens examined (including two foetuses) 

 were these lines exactly alike in detail. Similar lines about the pectoral are shown 

 in Sars's figure of the Finmark specimen (80, pi. 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. 1 The tubercles are elongated. In the Newfoundland speci- 

 men, No. 5, the larger ones were 4 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 (80, pi. 2), which has been copied in the 

 Encyclopaedia 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 1319 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 inaudible, 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 (pi. 37, fig. 3) there were about 24 on the upper jaw, and 28 on the 

 lower jaw. In No. 21 (pi. 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. 



Eschricht's figure of the foatal Greenland Humpback shows 5 tubercles in the 



1 Rudolphi (76, 135) states that the type of B. longimana 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. 



