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, Io 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. 
f. Teeth 22 on each side above and below. TURSIOPS 
ff. Teeth 37 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 Turstops Gervais. 
Tursiops truncatus (Montagu). 
Bottle-Nosed Dolphin, ‘Porpoise.”’ 
PLATE Q. 
Length, g 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 ona 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. 
True’s authority, that a company was incorporated in New Jer- 
4 MU 
