THE MAMMALS OF NEW JERSEY. 49 



a. Teeth 6 to 14 on each side in the lower jaw only. grampus 



aa. Teeth in both jaws. 



b. Teeth few, 8 to 13 on each side above and below. 



c. Confined to the front portion of the jaws, 8 to 10 on each side. 



GLOBICEPHALA 



cc. Distributed all along the jaws, 10 to 13 on each side. orcinus 

 bb. Teeth numerous, 22 to 50 on each side above and below. 

 d. A projecting snout. 



e. Palatine area — i. e., roof of the mouth — flat. 



/. Teeth 22 on each side above and below. tursiops 



ff. Teeth 27 above and 34 below on each side. 



PRODELPHINUS 



ee. Palatine area with longitudinal ridge in middle, a deep 



groove on each side; teeth 47 to 50 above, 46 to 51 below, 



on each side. • delphinus 



dd. No projecting snout, head rounded, teeth 26 above and below 



on each side. phocaena 



Genus Tursiops Gervais. 



Tursiops truncatus (Montagu). 



Bottle-Nosed Dolphin, "Porpoise." 



Plate 9. 



Length, 9 feet. Stout, forehead sloping; beak short and de- 

 pressed, dorsal fin about midway between the nose and tip of 

 the tail. Color plumbeous gray, lighter on the sides and white 

 beneath. Teeth, 22 on a side in each jaw. 



This is apparently the commonest species on the New Jersey 

 coast, and the schools of "porpoises" which we see rising and 

 plunging again with such rhythmic motion just beyond the line 

 of the breakers are probably, for the most part, this species. 



They travel in schools sometimes of considerable numbers, 

 old and young together, and feed upon various species of fish. 

 Regular porpoise fisheries have been established at certain points 

 on our Atlantic coast, notably at Cape Hatteras, where, in the 

 season of 1884-5, according to Dr. True, no less than 1,200 were 

 captured and oil extracted from them, the average yield in win- 

 ter being 8 gallons to each animal. Mr. Rhoads states on Dr. 

 T'rue's authority, that a company was incorporated in New Jer- 

 4 MU 



