DEER. 49 



The Pudu (Pudu humilis), of the Andes. (Case 93.) 

 The Peruvian Roebuck (Furcifer antisiensis), from the Peruvian 

 Andes. (Case 94.) 



The Musk-Deer (Moschus moschiferus) differs in many impor- 

 tant structural characters from the other Deer, especially by its 

 entire want of horns, and the great development of its canine 

 teeth, which project outside the mouth some way below the chin. 

 It is covered with a coat of long and thick hair, well adapted for 

 keeping out cold ; its toes are so articulated as to open out very 

 widely, an arrangement by which it is enabled to pass with ease 

 over deep snow. It is an alpine animal, inhabiting the mountains 

 of Central Asia from Thibet to China and Siberia. The " musk," 

 which is now used as a perfume rather than a medicinal drug, 

 continues to be a valuable article of trade. It is contained in a 

 pouch of the size of a small hen's egg, on the lower part of the 

 abdomen of the male. 



Order VIII. SIRENIA. 



See Osteological Gallery, p. 94. 



Order IX. CETACEA. 



See Cetacean Gallery, p. 104. 



Order X. EDENTATA. 



(Cases 33 and 34.) 



The Edentata, so named on account of the incompleteness of 

 their dentition, or entire want of teeth, contain several widely 

 different groups. 



The first, that of the Pilosa or Hairy Edentates, comprises the 

 Sloths and Anteaters, which, though apparently very distinct, are 

 yet linked together by numerous fossils filling up the gap between 

 them. 



The Sloths (Bradypodidae) are characterized by their short round [Case 33.] 

 heads, long fore legs, toes fastened together by skin and termi- 

 nating in long curved claws, and by their coat of coarse brittle 

 hairs. They are entirely tailless. They pass their whole existence 

 on trees, hanging by their long and powerful claws to the under- 

 side of the branches, never descending to the ground unless 



