172 



THE WHALEBONE WHALES OF THE WESTERN NORTH ATLANTIC. 



not SO unimportant variations. Its size also can diflPer in a high degree in different 

 individuals. In some examples it was noticeably smaller in proportion than in 

 Malm's specimen, so that it could be taken for an insignificant process or point pro- 

 jecting from the dorsal keel. In other individuals it was more developed, now 

 more erect, now more strongly curved backward, though without ever approaching 

 near the size it has in the other Finbacks." 



The same range of variation of form was found in the dorsal fin of the New- 

 foundland Sulphurbottom, as will be seen by consulting text figs. 37-42. The 

 following vai'iations were observed : 



No. 1. Female. Dorsal strongly recurved ; tip I'egularly I'ounded ; posterior 

 margin deeply concave. (Text fig. 39.) 



No. 2. Male. Dorsal erect, triangulai'; tip sharp; posterior margin straight. 

 (Text fig. 42.) 



No. 3. Female. Dorsal intei-mediate in curvature between those of Nos. 1 

 and 2; neither so recurved as in No. 1, nor so straight as in No. 2. 



Fig. 37. 



Fig. 33. 



Fk:. 3<j. 



F]G. 40. 



Fig. 41. 



Fig. 42. 



Fig. 43. 



Fig. 44. 



DORSAL FIN OF BALJENOPTERA MUSCULUS (L.) 



Fig. 37, — No. 14, s, E..\lena St.^tion, Newfou.ndland. Fig. 38. — No. 22, 'i , ditto. Fig. 39. — No. 1, 9, ditto. 



Fig. 40. — No. 7, ,? , ditto. Fig. 41. — No. 11, ,5 , ditto. Fig. 42. — No. 2, .» , ditto. Figs. 43 



AND 44. — Iceland. (From Hallas.) 



No. 4. Female. Dorsal almost exactly as in No. 1. 



No. 5. Male. Dorsal had been injui-ed and also had a semicircular piece 

 missing from the posterior margin, as if cut out by a bullet. 



No. 7. Male. Dorsal moderately recurved; tip cpiite sharp; posterior margin 

 deeply concave. (Text fig. 40.) 



No. 11. Male. Doi'sal large, ei'ect, I'ather sharp at the apex ; posterior margin 

 moderately concave. (Text fig. 41.) 



