THE OSTEOLOGY OP THE PIG. 369 



convex, antero-posteriorly ; tlie coronoid process ascends 

 hardly liiglier than it. In a longitudinal section, the 

 cavity of the cerebral hemispheres is more rounded than in 

 the Horse, and lies above, as well as in front of, that for 

 the cerebellum. 



The scapula is long and narrow. It is devoid of acromion, 

 and has but a small coracoid process. 



The radius and ulna are complete, but are ankylosed to- 

 gether in the prone position. The distal end of the ulna 

 articulates with the cuneiform bone. 



The carpus contains eight bones, but the radial bone in 

 the distal series may be either the trapezium, or a rudiment 

 of the poUex. The lunare, and the axis of the third meta- 

 carpal have the same relation as in the Horse. The thii-d 

 and fourth digits are larger than the other two, and form 

 a symmetrical pair. There are sesamoid bones on the 

 ventral face of the articulations between the metacarpal and 

 the basal phalanx, and of that between the middle and the 

 distal phalanges. Each distal phalanx is incased in a small 

 hoof. The femur has a roimd ligament. There is no third 

 trochanter. The fibiila is complete, and its distal end 

 articulates with the calcaneum. There are the usual seven 

 tarsal bones. The tibial end of the astragalus has the form 

 of a deeply-grooved pulley, the direction of the groove 

 corresponding nearly with the length of the foot. The 

 distal end presents a convex subcylindrical surface divided 

 by a ridge into two facets, of which one is somewhat less 

 than the other, and articulates with the cuboid. 



The metatarsus and phalanges of the pes are disposed like 

 the corresponding bones in the manus. 



The fore part of the body is supported upon the anterior 

 extremities by a mvisciilar sling composed of the serratus, 

 levator anguli scapulcB, and sternoscapiilaris, much as in the 

 Horse, with which the Pig exhibits a general coiTespondence 

 in its myology. The muscles which move the digits, how- 

 ever, have undergone less modification. Each digit of the 

 manus, for example, has its proper exte?isors, and there is 

 an extensor ossis metacarpi pollicis which ends on the basal 



2 B 



