bination of the Generic and Specific names, as original- 

 ly proposed by Linneus. The use of the two names is 

 called the Binomial System of Nomenclature. The use 

 of a third name indicates a subspecies. The system of 

 naming animals in this way is an attempt to distinguish 

 among closely related individuals. For instance, a fam- 

 ily may have the generic name of Smith, but, there 

 being several members of the family, it is necessary to 

 assign specific names to the various members of the 

 family, so there may be John Smith, Katherine Smith 

 and William Smith. 



The Classified list of Pennsylvania Mammals on 

 the following pages will serve to illustrate the organi- 

 zation of scientific Classification. 



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