THE SKIN AND SKELETON. 



151 



Pig. 117.— Skeleton of the Horse (Eqilus cahallus) : 22, premaxillat-y : 12, foramen fn 

 the maxillary ; 15, nasal ; 9, orbit ; 19, coroDoid process of lower jaw ; 17, surface 

 of implantation for the maeseter muscle; there are seven cervical vertebrae, nine- 

 teen dorsal, D-^D; five lumbar, o-e; live sacral, f-l; and seventeen caudal, p-r} 

 51, scapnla, or shoulder-blade ; i, spine, or crest ; 7i, coracoid process (acromion 

 wanting) ; 1, first pair of ribs (clavicle wanting, as in all Ungulates) ; e, sternum ; 

 a, shaft of hnmerus; 6, deltoid ridge ; g^ head fitting in the glenoid cavity of the 

 ecapnla— near it Is a great tuberosity for the attachment of a powerful mnscle » 

 fcf condyles ; 64. radios, to which is firmly anchylosed a rudimentary ulna, 55, the 

 olecranon ; 56,T;he 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; G8, hock, or heel, falsely called kueet 69, metatarsals. 



