%, 'I'- 



ll,; 









58 



American. Of these, the birds offer many genera peculiar to North 

 America, while the few Mammalia are of Neotropical genera. The 

 gre«atest resemblance between the North American and Palaearctic 

 region is seen in the Mammalia. Around the Arctic regions as well as 

 further south, several species, both of Mammalia and Birds, arc 

 identical. 



Among Mollusks there is also much resemblance. Anodonta, Vnio, 

 and Siiccinea are common to both the northern faunae, but have no 

 common species ; all three greatly predominate in numbers in North 

 America. The snails of the west coast are very European in character, 

 but there are but few Pupae in the Kegio Nearctica, and no Clausiliae^ and 

 BulbmiH is represented by few species. 



II.— NUMBER OF SPECIES. 



Tlio numbers of the Vertebrata found in the Nearctic realm are nearly 



as follows: 



jMammalia: 



Monotremata 



Marsupialla , 1 



Edentata 1 



Rodentia 139 



Inscctivora 28 



Chiroptera , 23 



Cetaeea 42 



Sirenia 1 



Hyracoidea 



Prohoscidea 



Perissodactyla 



\ Omnivora 1 



Artiodactyla ■{ 



^ Riiminantia 14 



( Pinnipedia 13 



Carnivora < 



^ Fissipcdia 40 



Primates 1 



310 



AVES: 



( Oscines 30G 



Passercs < ^, ^ „„ 



i Clamatores 33 



Zygodactyli 36 



Syndactyli 20 





