Tribe I. PHOCINA.
Skull tapering in front. Nose-hole moderate. Molars, except the first, with two roots.
Phocina, Gray, Cat. Seals & Whales, p. 20.
Inhab. North Atlantic and Arctic Seas.
1. CALLOCEPHALUS.
Callocephalus, Gray, Cat. Seals & Whales, p. 20.
2. PAGOMYS.
Pagomys, Gray, Cat. Seals & Whales, p. 22.
3. PAGOPHILUS.
Pagophilus, Gray, Cat. Seals & Whales, p. 25.