92 



ORIGIN OF LIFE IN AMERICA 



European zoologists, and that many of their so-called species 

 are nothing more than varieties or races. In many cases this 

 criticism is not justified, but even if we regar'ded the forty- 

 five species of mammals peculiar to Alaska merely as varieties, 

 the fauna still retains a remarkably distinctive character which 

 can only have arisen through long-continued isolation. I 

 herewith give a list of the species of mammals confined to 

 Alaska. In doing so it must be understood that I am not com- 

 mitting myself to any opinion as to their specific distincit- 

 ness. 



Alces gigas. 

 Kangifer moutanua. 

 Oreamnos kennedyi. 

 Soiuropterus yukonenais. 

 Citellus osgoodi. 



„ nebulicola. 



„ beringensis. 



„ barrowensis. 



„ stonii. 

 Microtus operariua. 



,, unalascensis. 



,, kadiacensis. 



„ yakutatensis. 



,, sitkenais. 



,, innuitus. 



,, abbreviatus. 

 Ochotoua collaris. 

 Tamiaa oaniceps. 

 Peromyacua aitkensis. 

 Teonoma saxamana. 

 Evotomya dawsoni. 



,, orca. 



Evotomya wrangeli. 

 Lemmua minuaculus. 



„ nigripea. 

 Fiber spatulatua. 

 Lepua othua. 



„ poadromua. 

 Synaptomya wrangeli. 



„ dalli. 



Vulpes kenaienais. 

 „ pribilofensia. 

 „ beringenais. 

 Uraus middendorffi. 

 ,, kidderi. 

 „ dalli. 

 ,, eulophus. 

 ,, kenaienais. 

 „ emmonsi. 

 Muatela kenaienais. 



,, aroticus. 

 Sorex tundrenaia. 

 ,, glacialis. 

 ,, pribilofensis. 



The late Professor Asa Gray was the first to draw attention 

 to the relationship of the flora of America and that of Asia. 

 He was struck particularly with the remarkable resemblance 

 of some of the plants found in the eastern United States to 

 those inhabiting Japan. This particular feature, howeiver, 

 will be discussed in one of the subsequent chapters. It was 

 not till much more recently that botanists became acquainted 

 with the intimate floristic relationship between Alaska and 



