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.