THE SKIN AND SKELETON. 
151 
Fig. 117.—Skeleton of the Horse ( Equus caballus) : 22, premaxillary: 12, foramen in 
the maxillary; 15, nasal; 9, orbit; 19, coronoid process of lower jaw ; 17, surface 
of implantation for the masseter muscle; there are seven cervical vertebrae, nine¬ 
teen dorsal, D-D; five lumbar, a-e; five sacral, f-l; and seventeen caudal, p-r; 
51, scapula, or shoulder-blade; i, spine, or crest; h, coracoid process (acromion 
wanting); 1, first pair of ribs (clavicle wanting, as in all Ungulates); e , sternum : 
a, shaft of humerus; b, deltoid ridge ; g, head fitting in the glenoid cavity of the 
scapula—near it is a great tuberosity for the attachment of a powerful muscle 
k, condyles ; 54, radius, to which is firmly anchylosed a rudimentary ulna, 55, the 
olecranon ; 56, the seven bones of the carpus, or wrist; 57, large metacarpal, or 
“cannon-bone,” with two “splint-bones 58, fetlock-joint; 59, phalanges of the 
developed digit, corresponding to the third finger in Man; 62, pelvis; 63, the 
great trochanter, or prominence on the femur, 65; 66, tibia; 67, rudimentary 
fibula; 68, hock, or heel, falsely called knee; 69, metatarsals. 
