288 VERTEBRATE ANIMALS OF THE UNITED STATES 



L. suhsolanus Bangs. Color black and hazel, much darker than 

 L. canadensis; length 920 mm.; tail no mm; hind foot 220 mm.: 

 Newfoundland. 



Order 7. Pinnipedia. — Seals. Aquatic mammals of large size 

 and carnivorous habits, and closely related to the Order Carnivora; 

 feet transformed to flippers; toes 5-5, joined by a thick membrane; 

 hinder limbs directed backwards and used for swimming; usually no 

 external ears present: about 50 species, in temperate and Arctic seas; 

 in Lake Baikal (freshwater); about 11 species on the coasts of the 

 United States and Canada, grouped in 2 families. 



Key to the Families of Pinnipedia 



ai External ears present i. Otariidcr. 



&2 External ears absent 2. Phocidce. 



Family i. Otariidae. — Hind limbs capable of being turned forward 

 and used for walking; ears present; forelegs long; claws small and rudi- 

 mentary, except those on digit 3 of the foot: 3 genera and species on 

 the Pacific coast. 



1. Zalophus Gill. Ears short; dentition 3/2, i/i, 4/4, i/i; head 

 rounded; nose narrow, pointed: i species. 



Z. californianus (Lesson). Sea-Hon. Color reddish brown in 

 summer, lighter in winter; length 2,542 mm.; tail no mm.; hind foot 

 380 mm.; weight 500 lbs.; body slender; snout long: southern Mexico 

 to northern California. 



2. Eumetopias Gill. Ears rather long; dentition 3/2, i/i, 4/4, 

 i/i; upper molar separated by a wide space from the premolars: i 

 species. 



E. juhata (Schreber). Steller's sea-lion. Color reddish brown; 

 length 3,000 mm.; weight 1,500 lb.: Bering Strait to Farollon Islands, 

 California. 



3. Callorhinus Gray. -Dentition 3/2, i/i, 4/4, 2/1; facial portion 

 of skull short : i species. 



C. alascanus Jordan and Clark. Fur seal. Color chestnut brown ; 

 length 1,887 nii^-l tail 51 mm.; hind foot 548 mm.: Bering Strait to 

 CaUfornia. The animals breed on the Pribilof Islands in June, spending 

 the summer and fall there; in the winter and spring they migrate 

 southward, ranging as far south as southern California. 



Family 2. Phocidae. — Hind limbs directed permanently backwards, 

 and of no use in walking; ears absent; fore legs short; claws well devel- 

 oped: about 5 species on the American coasts. 



