330 MAMMALIA: CETE. — LI. 
Famity CXCI. DELPHINIDA. (THE Do.rpurns.) 
Cetaceans with well developed teeth in both jaws (deciduous in 
the upper jaw in one genus) and a single, somewhat complicated 
nasal tube. Genera 17, species about 40, including the smaller 
of the Cetacea, but many of the most active and voracious of the 
species. 
a. Head with an elongate beak; a distinct dorsal fin. 
6. Teeth in each soy about 44; truncate at tip; palate without lateral 
grooves. . « + 6 we es os 8 ORSIGEE ame. 
bb. Teeth in each jaw 80 ‘es 120. 
z. Palate without lateral grooves... . . . . PRODELPHINUS, 567 (b). 
zx. Palate with deep lateral grooves. . . . . . DELPHINUS, 568. 
aa. Head with a very short beak or none. 
c. Teeth in both jaws persistent. 
d. Teeth flattened; dorsal present. . . . . . . PHOCANA, 569. 
dd. Teeth terete. 
e. Dorsal fin well developed. 
jf. Teeth in each jaw 44 to 46; dorsal fin falcate. 
LAGENORHYNCHUS, 570. 
Jf. Teeth in each jaw 16 to 24. 
g. Dorsal moderate; head almost globular; P. long and narrow; 
teeth rather weak, none in corner of mouth. 
GLOBICEPHALUS, 571. 
gg. Dorsal very high, sword-shaped, its height greater than length 
of pectorals; teeth very strong; skull massive. ORCA, 572. 
ee. Dorsal fin obsolete; pectoral short; teeth few. 
DELPHINAPTERUS, 573. 
cc. Teeth in upper jaw feeble, disappearing with age; 6 to 14 bluntish 
teeth in lower jaw; dorsal fin low, rather posterior. GRAMPUS, 574. 
567. TURSIOPS Gervais. (Lat., tursio, porpoise.) 
1087. T. tursio (L.). BoTTLE-NosE Dotpuin. Gray above, 
pure white below; beak short and stout; teeth 44. Vertebre 
7+18+37. L. 11 feet. N. Atl., common; caught in numbers 
at Cape May. (£u.) 
1088. T. erebennus (Cope.) Brack Dotrnry. Wholly black ; 
premaxillaries forming an elevated, rounded ridge; teeth {}. 
Vertebre 7 hua one eae L. 8 feet. Atlantic Coast of U.S 
(€peBevvds, black as Erebus.) 
567 (b). PRODELPHINUS Gervais. 
1089. P. plagiodon (Cope). Sporrep Dorpurin. Form of 
D. delphis ; dorsal high, recurved; P. broad; beak stout. Dark 
purplish slate-color, above; white below; back and fins spotted 
with pale; lower parts spotted with dark slate. L. 10 feet. N. Atl., 
S. to N. J. (addyios, oblique; dda, tooth.) 
