Paw 



Family Castoridae 317 



Castor canadensis, Beaver 317 



Family Cricetidae 317 



Synaptomys borealis, Lemming mouse 317 



Lemmus trimucronatus , Lemming 318 



Dicrostonyx groenlandicus, Collared lemming 318 



Clethrionomys rutilus, Red-backed mouse 320 



Microtus oeconomus, Meadow mouse 320 



Microtus pennsylvanicus, Meadow mouse 324 



Ondatra zibethicus, Muskrat 324 



Family Muridae 324 



Mas musculus, House mouse 324 



Rattus norvegicus, House rat 325 



Family Zapodidae 326 



Zapus hudsonius, Jumping mouse 326 



Family Erethizontidae 327 



Erethizon dorsatum, American porcupine 327 



Family Ochotonidae • • ■ 327 



Ochotona collaris, Collared pika 327 



Family Leporidae 327 



Lepus americanus, Varying hare 327 



Lepras othus, Arctic hare 328 



Family Cervidae 328 



Cervus canadensis, Elk (Wapiti) 328 



Odocoileus hemionus, Black-tailed deer 328 



Alces alces, Moose 329 



Rnngifer arcticus, Barren ground caribou 329 



Rangifer sp., Reindeer 331 



Family Bovidae 332 



Ovis dalli, Dall sheep (White sheep) 332 



Family Hydrodamalidae 332 



Hydrodamalis gigas, Steller sea cow 332 



Family Balaenidae 333 



Eubalaena sieboldi, Pacific right whale 333 



Balaena mysticetus, Bowhead whale 333 



Family Eschrichtidae 334 



Eschriclitius glaucus, Gray whale 334 



Family Balaenopteridae 334 



Balaenoptera physalus, Finback whale 334 



Balaenoptera borealis, Sei whale 334 



Sibbaldus musculus, Blue whale 335 



Megaptera novaeangliae, Humpback whale . . 335 



Family Physeteridae : • • 335 



Physeter catodon, Sperm whale 335 



Family Delphinidae 335 



Grampus rectipinna, Pacific killer whale 335 



Globicephala scammonii, Pacific blackfish 337 



Lissodelphis borealis, Right- whale porpoise 337 



Lagenorhynchus obliquidens, Pacific striped porpoise 337 



Phocoena vomerina, Pacific harbor porpoise 337 



Phocoenoides dalli, Dall porpoise 338 



Family Monodontidae °°° 



Delphinapterus leucas, White whale (Beluga) 338 



ix 



