Skulls of Rabbit (left) and Woodchuck (right) 



Showing Herbivorous Dentition, Contrasted Witli the Carnivorous Dentition 

 of the Mink (center). 



shoulder, or PECTORAL GiRDLE, has no direct articula- 

 tion with the Vertebral Column and is held in place 

 by Muscles. It is made up of the Shoulder Blade, or 

 Scapula, and the Collar Bone, or CLAVICLE, although 

 not all Mammals possess the latter. 



The posterior girdle is called the PELVIC GiRDLE, 

 which is attached to the Sacral Vertebrae, and affords 

 a solid support for the hind legs. The Pelvis is com- 

 posed of three parts, the ILIUM, the ISCHIUM and the 

 Pltbis, which are separated in young Mammals but 

 fused together in old ones. These three parts are united 

 in a deep, hemispherical pit called the ACETABULUM, 

 which receives the head of the Thigh bone in a ball 

 and socket manner. 



The limbs are composed of three segments. In the 

 Fore limbs they are the UPPER Arm, Fore Arm and 

 the Hand. In the hind limbs they are the Thigii, Leg 

 (Shank) and the FoOT. The upper bone in the Arm is 

 the HUMERL^S, and those of the fore-arm are the 

 Radius and the Ulna. The fore-foot, or hand, is also 

 composed of three parts, corresponding to the Wrist, 

 Palm, or back of Palm, and the FiNGERS. The bones of 

 the Wrist constitute the CARPUS: those of the back and 

 palm, the METACARPUS: and those of the fingers or 



-^ 47 >«- 



