DELPHINIDA. — CXCI. 333 
nasal tube. Genera 17; species numerous, including the smaller 
and many of the most active and voracious of the Cetacea. 
uv. Head with an elongate beak; a distinct dorsal fin. 
d, Teeth in each jaw about 44; truncate at tip; palate without lateral 
grooves... . 2 . 2 « ¢ +» e e « +  Turstops, 571. 
bb. Teeth in each jaw 80 to 120. 
w. Palate without lateral grooves. . . . . » » PRODELPHINUS, 572. 
az. Palate with deep lateral grooves. . . . . . DELPHINUS, 573. 
aa. Head with a very short beak or none. 
c. Teeth in both jaws persistent. 
d. Teeth flattened; dorsal present. . . . . . PHoomna, 574. 
dd. Teeth terete. 
c. Dorsal.fin well developed. 
J. Teeth in each jaw 44 to 46; dorsal fin falcate. 
LAGENORHYNCHUS, 575. 
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. 
GLOBICEPHALA, 576. 
99. Dorsal very high, sword-shaped, its height greater than length 
of pectorals; teeth very strong; skull massive. Orca, 577. 
~ee. Dorsal fin obsolete; pectoral short; teeth few. 
DELPHINAPTERUS, 578. 
ec. Teeth in upper jaw feeble, disappearing with age; 6 to 14 bluntish 
teeth in lower jaw; dorsal fin low, rather posterior. GRrampus, 579. 
571. TURSIOPS Gervais, (Tursio, porpoise; dy, 
appearance.) 
1097. T. tursio (Fabricius). Bottiz-Nosz Dotpuin. Gray 
above, pure white below; beak short and stout; teeth 44. Ver- 
tebre 7+18-+37. L.11feet. N. Atl., common; caught in num- 
bers at Cape May. (Eu.) 
572. PRODELPHINUS Gervais. (apo, before; Delphinus.) 
1098. P. plagiodon (Cope). Sporrep Doxpuin. Form of 
D. delphis; dorsal high, recurved; arm 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. toN. J. (addytos, oblique ; 65a», tooth.) 
573. DELPHINUS Linneus. (deAdis, dolphin.) 
1099. D. delphis L. Common Do.puin. Snout narrow, 
sharp; occiput short, rounded. L. 10 feet. N. Atl, scarce on our 
coast. (Eu.) 
574, PHOCAINA Cuvier. (gcxawa, porpoise, from an, seal.) 
1100. P. phoczena (L.). Common Harzor Porpoise. Putr- 
FInc Pic. Swurrer. Color nearly plain dusky above, paler 
below. L.5 feet. N. Atl. and N. Pac., very common in surf 
