48 PHOCAENA. 
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. II]. Delphinidse—Dolphins, Porpoises, ete. 
F. W. True. A review of the family Delphinide, Bull. U.S. Nat. 
Mus., 1889, No. 36, pp. 1-191, pls. 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. |. Delphinapterine. 
20. Phoezna. Porpoises. 
Phoczena G: Cuv., Nouv. Dict. Hist. Nat., 2d ed., 1, £817) maeeeee 
Regn. Anim., 1829, p. 289. Type Delphinus phocena Linneus. 
Head not beaked, rostrum short, broad, tapering; premaxille 
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 vertebre coalesced. 
34 phoczena (Delphinus), Linn., Syst. Nat., 1, 1758, p. 77. Elliot, 
Syn. N. Am. Mamm., Suppl., rgo01, p. 482. 
commums G. Cuv., Régn. Anim., 1817, p. 279. Elliot, Syme: 
Am. Mamm., 1901, p. 20. 
vomerina Gill, Proc. Acad. Nat. Scien. Phil., 1865, p. 178. 
brachycrum Cope, Proc. Acad. Nat. Scien. Phil., 1865, p. 279. 
? lineata Cope, Proc. Acad. Nat. Scien. Phil., 1876, pp. 134, 135- 
