1 8 ELEMENTS OF MAMMALIAN ANATOMY. 



17. What is the ultimate syllable of all family names? 



18. Explain what is meant by binomial nomenclature. 



19. Name three families of Carnivora. 



20. Examine specimens and determine wherein the teeth of Canidse 

 differ from those of Felidae. 



21. What two rank names constitute the scientific name of an animal? 



22. Give the scientific name of five Carnivora, two Ungulata, and 

 two Primates. 



23. Define organ, system, tissue, and cell. 



24. Name two organs belonging to each system. 



25. How do the elements of the four kinds of tissue differ? 



EXTERNAL FEATURES. 



The cat, like all other mammals, possesses two well- 

 defined skeletons, the endoskeleton, consisting of the true 

 bones, and the exoskeleton, composed of the skin and its 

 appendages. The skin invests the body completely and is 

 continuous with the lining of the digestive and urogenital 

 canals. It varies in thickness in different regions, being 

 very thin on the lips, ears, and eyelids, and exceedingly 

 thick on the pads of the feet and on the ventral neck region, 

 where, in contest with an enemy, it is most likely to be 

 seized. A fibrous connective tissue binds the skin to the 

 subjacent structures. In some places the union is very 

 firm, as on the distal parts of the limbs and the head, while 

 in other regions it is loose, as on the lateral aspect of the 

 trunk. 



The skin consists of an external layer, the epidermis, and 

 beneath this, the dermis or true skin, designated the corium. 

 The epidermis is composed of numerous strata of epithelial 

 cells. Those on or near the surface are much flattened 

 while the deeper ones are more or less cubical. As the 

 superficial layer desquamates in minute fragments, forming 

 what is commonly called dandruff, it is replaced by cells 

 developed from the deeper layers. 



At the orifices of the internal passages, such as the diges- 



