66 



BAL^WOPTERID^. 



5. Sibbaldius tectirostris. 



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

 Inbab. Nortb Pacific. Skeleton, Mus. Philad. 



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. BAL.ffiNOPTERID^. Pike Whales. 



Balsenopterina, Grai/, I. c. p. 114. 



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



BaUionopteridae, Gray, Synops. Whales Sf 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. Ribs 11 . 11. The second cervical 

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

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



1. BALiENOPTERA. 



Balaenoptera, Gray, I. c. pp. 114, 186 ; Synops. "Whales 8f 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. Balsenoptera rostrata. B.M. 



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

 ^ Dolph. p. 3, t. 1. f. 6 (baleen), t. 2 (skull), t. 32. f. 3, 4 (cervical 

 vertebrae) j Van Beneden, Osteogr. Ck. t. 12 & t. 13. figs. 1-10. 



Inhab. North Sea. 



2. Balsenoptera velifera. 



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

 f. 9, 10. 



Dorsal fin large. 



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



Sound. 



