THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 169 



at their posterior ends. Under the base of the pectorals a semicircular area of 

 nearly pure white about two feet in diameter. Light (but not white) spots scattered 

 far forward and anterior to the line of the corner of the mouth. Navel white. 

 Proximal half of the anterior margin of the right pectoral invaded by the dark 

 color of the external face. Tip dark, with various dark lines extending backward 

 on the internal face. Left pectoral all light gray at the base externally, and light 

 blotches and marks extend nearly to the tip. (See pi. 17, figs. 2 and 4.) 



No. 21. Female. July S, 1901. Total length, 65 ft. 2 in. A very light 

 individual. The ground color light gray and the markings nearly white. On the 

 abdominal ridges a broad band of white extends from the base of the pectorals 

 (where there is a large white area) obliquely downward and backward to the pos- 

 terior end of the ridges, being produced by the coalescence of the white spots. 

 Anteriorly, white spots extend on the ridges far beyond the line of the eye. Light 

 streaks above and below the eye, and some light blotches on the left jaw. An 

 almost white line runs into the eye from behind and streaks of nearly pure white 

 cover a triangular area between the eye and the ear. Inferior median line, from the 

 navel to the pudendum, plain gray. Numerous white dashes around the anus and 

 pudendum. Flukes with a white ground underneath anteriorly, overlaid with gray 

 fore-and-aft lines. The white of the underside of the left pectoral invades the 

 external face at the tip, making the whole tip white externally ; white lines run 

 from the tip externally, nearly one-quarter the length of the fin. (See pi. 14, fig. 

 2 ; pi. 18, fig. 2 ; pi. 20, fig. 2 ; pi. 21, fig. 3.) 



No. 25. Female. July 8, 1901. Total length, 69 ft. 6 in. A light indi- 

 vidual. Inferior median line blotched throughout. Much white on the abdominal 

 ridges. Dorsal fin not light, nor white. 



No. 26. Female. July 8, 1901. Total length, 65 ft. 8 in. A dark indi- 

 vidual. The flanks show much more dark gray than light, the blotches of the 

 latter color being distinct from each other and scattered. White spots on the 

 abdominal ridges clear, but scattered. At the head of the humerus the same, but 

 above the pectoral fin the blotches on the sides of the body fuse together into a 

 nearly solid light area. Light color extends forward to the eye and the corner of 

 the mouth. Tip of the pectorals, externally, white for about a foot. (See pi. 17, 

 figs. 1 and 3.) 



Hallas gave in 1868 (60, 162) most excellent data regarding the color of six 

 Iceland Sulphurbottoms, which make it possible to institute detailed comparisons 

 with the Newfoundland specimens. His notes on color reduced to tabular form 

 are as follows : 



BALMNOPTERA MUSCULUS (L.). ICELAND. 



Color of head and back. 



A. Tegarhorn, Berufjord. $ . Dark gray, with single irregularly-distributed lighter dashes 



and spots. 



B. Vedfjord, in Nordfjord. I . Uniform dark gray. 



C. Ditto. fj . Dark gray, with lighter dashes, or spots. 



D. Ditto. f, . Uniform dark gray. 



E. Ditto. J . Dark gray, without gradations. 



F. East of Seydifsjord. ? . Dark gray, with lighter dashes and spots. 



