BALAENOPTERA. 



Fig. 3. Tympanic bones of Bal/enoptera acuto rostrata. Inner and outer surface. 

 No. 289 Field Columbian Museum Coll. 



Geogr. Distr. North Atlantic, Davis Straits. 



Genl. Char. Smallest of the species; vertebrae, 48, eleven bearing 

 ribs. Dorsal fin high, far forward on the body. 



Color. Above grayish black, beneath white including inferior 

 side of flukes; inner sides of pectorals white, and a broad white 

 band on outer side. Baleen yellowish white. 



Measurements. Total length, 30 feet. 



15. davidsoni. {Baleenopiera), Scamni. Proc. Calif. Acad. Scien., 



1872, iv, p. 269. 



Type locality. Admiralty Inlet, coast of Washington. 



Geogr. Distr. Mexico to Bering Straits, west coast of North 

 America. 



Genl. Char. Head pointed, dorsal small, falcate: pectorals 

 small, narrow; baleen pure white. Lamina;-, 270 on each side, not 

 exceeding 10 feet in length. 



Color. Above dull black, beneath white; pectoral and caudal 

 fins black above, white beneath; a white band across pectorals near 

 their base. Gular folds 70, milky white, interspaces pinkish. 



Measurements. Total length, 27 feet; pectorals 4 feet i inch 

 wide; height of dorsal 10 inches; width of flukes 7 feet 6 inches. 



16. velifera. {Balienoptera), Cope, Proc. Acad. Nat. Scien. Phil., i86g. 



p. 16. 

 Type locality. Shores of Oregon and California. 

 Geogr. Distr. North Pacific Ocean; coast of California and Ore- 

 gon, Commander Islands. 



Genl. Char. Size large, width of flukes one-fourth total length. 



