46 



MAMMALIA. 



fore, four behind. Interior of the mouth and bottom of the 

 feet furnished with hair like the rest of the body ; ears long ; 

 tail short. 



Genus VI. Cavia, Illig. Guinea-Pigs. 



Molars composite, each only one simple lamina and one 

 forked, no tail ; toes free, four before, three behind. These 

 are little timid Mammalia, living on dry soils, where they 

 pass the day in the shelter of stones and brambles, seeking 

 their food at night. The species so common in Europe under 

 the name of Guinea-pig is originally from the immense forests 

 of Brazil. 



ORDER VI. EDENTATA* 



No incisive teeth in either jaw ; sometimes canines and 

 molars, sometimes molars only, often no teeth at all. Nails 

 enveloping the ends of the toes, and approaching to the nature 

 of hoofs ; at least the rudiments of clavicles. Three families. 



FAMILY I. TARDIGRADA. 



So named from the slowness of their motions. Face short; 

 molars cylindrical ; canines sharp, longer than the molars ; 

 two pectoral mammae ; toes united by the skin and terminated 

 by enormous claws compressed and crooked, and when in 

 repose, bent towards the palm of the hand or the sole of the 

 foot ; forearms much longer than the thighs and legs, making 

 it a painful effort to walk. Habitation upon trees which they 

 strip of leaves. One genus. 



Bradypus, Lin. Sloth. 



Two species, the Ai and Unau, natives of the hot parts of 

 America. 



FAMILY II. EDENTATA ORDINARIA. 



Ordinary Edentata with a pointed muzzle, and some with 

 cheek teeth. Four genera. 



Without front teeth. 



