5. SIBBALDIUS. 55 



5. SIBBALDIUS. 



Sibbaldius, Gray, I. c. p. 175, 1865 ; Synops. Whales # Dolph, p. 3. 

 Flowerius, Lilljebory, Nova Acta Upsal. vi. 1867. 



Dorsal fin very small, far behind, and placed on a thick promi- 

 nence, llibs 14 . 14 ; first short, sternal end very broad and deeply 

 notched. Sternum trifoliate, with a short broad hinder lobe. Sca- 

 pula broad, with very long acromion and short slender coracoid pro- 

 cess. Fingers ? 



1. Sibbaldius borealis. 



Sibbaldius borealis, Gray, I. c. p. 175, fig. 39; Synops. Whales 8f 



Dolph. p. 3. 

 Flowerius gigas, Lilljebory, Nova Acta Upsal. vi. 1867. 



Inhab. North Sea. 



Mr. Flower considers B. borealis, Cope, Proc. Acad. Nat. Sci. 

 Philad. 1866, p. 297, from North Atlantic, as very nearly allied to 

 Balamoptera Schlegelii. 



2. Sibbaldius Schlegelii. 



Sibbaldius Schlegelii, Gray, I. c. p. 178, figs. 40-48 ; Synops. Whales 



Sf Dolph. p. 3. 

 Balamoptera Schlegelii, Van Beneden, Ostcvyr. Cet. t. 14 & 15. 



Inhab. Java. 



Cervical vertebrae separate (t. 14. f. 5-12) ; the second with a 

 broad short lateral expansion, having a moderate-sized oblong per- 

 foration. Beak of skull very long, three and a half times the length 

 of the brain-cavity. 



3. Sibbaldius ? antarcticus. 



Sibbaldius ? antarcticus, Gray, I. c. p. 381, fig. 87; Synops. Whales §• 



Dolph. p. 3. 

 Balamoptera antarctica, Van Beneden, Osteoyr. Cet. p. 234. 



Inhab. Buenos Ayres. 



Van Beneden regards it as a doubtful species. 



4. Sibbaldius sulphureus. 



Sibbaldius sulphureus, Cope, Proc. Acad. Nat. Sci. Philad. 1869, 



pp. 10, 19, f. 11. 

 Sulphur-bottom of the Whalers on the North-west Coast. 



Dorsal fin very far back. 



Inhab. North Pacific, north-west coast of America, California. 



