SKIN DISEASES. 201 



The spine consists of 7 cervical, 18 dorsal, and 6 lum- 

 bar vertebrse — Total 32 



The thorax is made up of the dorsal vertebrse, with 

 18 ribs on each side, and the sternum in the middle 

 —Total 37 



The pelvis comprises 2 ossa innominata (or ilium, 



ischium, and pubes), and 1 sacrum — Total ... 3 

 The tail contains on the average 17 bones , . . . 17 

 The fore extremity is made up on each side of the 

 scapula, humerus, os brachii, and 8 carpal bones, 3 

 metacarpal, os suffraginis, os coronse, os pedis, os 

 naviculare, 2 ossa sesamoidea — Total on both sides 40 

 The hind extremity has the femur, patella, tibia, 

 fibula, 6 tarsal bones, 3 metatarsals, os suffraginis, 

 os coronse, os pedis, os naviculare, 2 ossa sesamoidea 



—Total 38 



Bones of the cranium 10 



Bones of the face and lower jaw ....... 18 



Teeth 40 



Bones of the internal ear, 4 in each organ .... 8 

 Os Hyoides, or bone of the tongue, made up of five 

 sections 5 



Grand total .... 247 



Skin. Diseases, — There are many, and apparently 

 different varieties of skin diseases described by writers, 

 many of which are the same, and produced by the same 

 cause, but present different appearances in different animals, 

 and in different stages and conditions of the affection. 

 Where the same cause can be properly assigned in pro- 

 ducing different diseases, although apparently dissimilar, 

 the treatment must be the same. Thus, if the acari is the 

 cause of more than one kind of skin disease, of course the 



