48 PHOC-flENA. 



and species outside the scope of this work. The beaks vary 

 greatly, and in some species are altogether absent, while in others 

 they are twice the length of the braincase. 



Fam. III. Delphinidie Dolphins, Porpoises, etc. 



F. W. True. A review of the family Delphinida, Bull. U. S. Nat. 

 Mus., 1889, No. 36, pp. 1-191, pis. 1-47. 



C. M. Scammon. The Marine Mammals of Northwest North 

 America, 1874, p. 40. 



Facial portion of skull produced usually into a beak; teeth nu- 

 merous in both jaws ; anterior ribs articulated to the transverse process 

 by a tubercle; sternal ribs ossified; lacrymal not distinct from the 

 jugal; pterygoids short, thin, and form, with a process of the palate, 

 the outer wall of the post palatine air-sinus; mandibular symphysis 

 short. 



Porpoises, often called "Sea Pigs" or "Hog-fish," are accustomed 

 to go in schools, sometimes in very large numbers, as they are very 

 sociable creatures, and are often seen in bays and harbors, as well as 

 in the open ocean. They swim with great rapidity, and frequently 

 play about the cutwater of a large steamer, even when the vessel is 

 going at full speed, and these animals are better known to the 

 majority of people than any of the other Cetaceans. The genus 

 contains numerous species, and they are met with in all seas. 



Subfam. I. Delphinapterinae. 

 2O. Phocseiia. Porpoises. 



25-25 



Phocsena G. Cuv., Nouv. Diet. Hist. Nat., 2d ed., ix, 1817, p. 163, Id. 

 Regn. Anim., 1829, p. 289. Type Delphinus phoccena Linnaeus. 

 Head not beaked, rostrum short, broad, tapering; premaxillag 

 tuberculate before the nares; nasals flat; frontals elevated; mandib- 

 ular symphysis short; teeth small, crowns spade-shaped, neck con- 

 stricted; dorsal fin triangular, small, blunt spines often on anterior 

 margin; pectoral fins ovate; first to sixth cervical vertebras coalesced. 



34 phocrena (Delphinus}, Linn., Syst. Nat., i, 1758, p. 77. Elliot, 



Syn. N. Am. Mamm., Suppl., 1901, p. 482. 

 communis G. Cuv., Regn. Anim., 1817, p. 279. Elliot, Syn. N. 



Am. Mamm., 1901, p. 20. 



vomerina Gill, Proc. Acad. Nat. Scien. Phil., 1865, p. 178. 

 brachycium Cope, Proc. Acad. Nat. Scien. Phil., 1865, p. 279. 

 ? lineata Cope, Proc. Acad. Nat. Scien. Phil., 1876, pp. 134, 135. 



