THE SKIN AND SKELETON. 149 
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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 vertebra, nine- 
teen dorsal, D-D; five lumbar, a-e; five sacral, f-J; and seventeen caudal, p- ; 
51, scapula, or shoulder-blade; 7, 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; }, 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, 59, called 
olecranon; 56, the seven bones of the carpus, or wrist ; 57, larze 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; 68, the 
great trochanter, or prominence on the femur, 65; 66, tibia; 67, rudimentary 
fibula; 68, hock, or heel, falsely called knee; 69, metatarsals, 
