INTRODUCTORY REMARKS. 



At the present day there is considerahle difference among systematic zoologists as to the 

 characters of the primary divisions among the Mammals, and the points upon which their classi 

 fication should be based. For my present purposes, however, I adopt the following arrangement: 



A. UNGUICULATA, (with claws.) 



1. TEETH OF THREE KINDS. 



a. Mammce two, on the breast. 



I. Quadrumana. Limbs free ; hind feet acting as hands. 



II. Cheiroptera. Arms provided with a naked membrane for flying. 



b. MammcB more than two: on the belly. 



III. Rapacia. Mammae free. 



IY. Harsupialia. Mammas contained in a pouch. 



2. TEETH OF LESS THAN THREE KINDS. 

 Y. Rodentia. Canine teeth alone wanting. 



VI. Edentata. Incisor teeth, sometimes canines and molars, wanting. 



B. UNGULATA, (with hoofs.) 



VII. Solidungula. With one hoof. 



VIII. Pachydermata. With two hoofs. 



IX. Ruminantia. With more than two hoofs. 



C. PINNATA, (with fins.) 



X. Pinnipedia. With four fins, 



XI. Cetacea. With two fins. 



Of the above orders all are found in North America except the Quadrumana; and although 

 the Solidungula, represented by the horse, do not now exist as native animals, yet there are 

 abundant evidences of the existence of the horse as an extinct genus, as well as of other forms 

 of the order. 



Although large collections of Cheiroptera or bats were made by the surveys, I do not propose 

 to work them up in the present report, owing to lack of time necessary to do it properly. The 

 same may be said of the Pinnipedia and Cetacea. 



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