56 BAL-EN0PTEBIDJ3. 



5. Sibbaldius tectirostris. 



Sibbaldius tectirostris, Cope, Proc. Acad. Nat. Set. Philad. 1869, p. 7. 



Inhab. North Paeifie. Skeleton, Mus. Pbilad. 



6. Sibbaldius tuberosus. 



Sibbaldius tuberosus, Cope, Proc. Acad. Nat. Set. Philad. 1867, p. 

 Sibbaldius laticeps, Cope, I. c. 1866, p. 297. 



Inhab. North-east coast of America. 



Family 5. BALJENOPTERID^J. Pike Whales. 



BaUenopterina, Gray, I. c. p. 1 14. 



Baloenoptera, Gray, I. c. p. 114 ; Lilljeborg, Nova Acta Upsal. vi. 



Bakenopteridae, Gray, Synops. Whales 8f Dolph. p. 3. 



Dorsal fin high, erect, compressed, about two-thirds of the entire 

 length from the nose. Pectoral fin moderate, with four short 

 fingers. Vertebrae 50 ; cervical vertebrae sometimes anchylosed. 

 Neural canal broad, trigonal. Eibs 11 . 11. The second cervical 

 vertebra with a broad lateral expansion, perforated at the base. 

 First rib single-headed. Lower jaw with a conical coronoid process. 



1. BALJENOPTERA. 



Balasnoptera, Gray, I. c. pp. 114, 186 ; Synops. Wliales $• Dolph. p. 3. 

 Fabricia, Gray, I. c. p. 382. 



The lower lateral processes of the third to the seventh cervical ver- 

 tebrae with an angular projection on the lower edges. Fingers short, 

 the length of the forearm-bone. 



Scapula broad ; acromion and coracoid elongate, slender. 



1. Balsanoptera rostrata. B.M. 



Baloenoptera rostrata, Gray, I. c. p. 188, figs. 49-53 ; Synops. Whales 

 % Dolph. p. 3, t. 1. f. 5 (baleen), t. 2 (skull), t. 32. f. 3,4 (cervical 

 vertebrae) ; Van Beneden, Osteogr. Cet. t. 12 & t. 13. figs. 1-10. 



Inhab. North Sea. 



2. Balsenoptera velifera. 

 Baloenoptera velifera, Cope, Proc. Acad. Nat. Sci. Philad. 1869, p. 18, 

 f. 9, 10. 



Dorsal fin large. 



Inhab. Oregon (Finner Whale) ; California, Queen Charlotte's 

 b^uud. 



