Common Pigeon, 179 



section along* the upper part of the keel of the sternum and 

 much of its lateral portion. It tapers anteriorly as it passes 

 along- the internal surface of the coracoid to enter the canal 

 formed for it by that bone together with the furculum and 

 scapula. This muscle is homologous with the comparatively 

 insig-nificant ' subclavius^ of anthropotomy. 

 u. Coracobrachialis inferior^ a muscle arising* from the inferior 

 and outer three-fifths of the distal part of the coracoid, and 

 inserted into the internal and proximal lip of the cup-shaped 

 pneumatic cavity of the humerus. The opposite lip of this 

 cavity receives the tendon of the teres major I; and from 

 the triang-ular space between the muscular bellies of these 

 two muscles the subscapularis muscle, together with the 

 upper portion of the scapula, and a small muscle, the ser- 

 ratus anticus, which passed between the fibres of the sub- 

 scapularis to be inserted into the inferior edge of the scapula, 

 have been removed. 



V. Coracobrachialis superior, a bicipital muscle with a very ex- 

 tensive origin ; arising, superiorly, from the inner surface of 

 the vertebral end of the clavicle; inferiorly, from a facet 

 on the lateral aspect of the upper surface of the sternal 

 rostrum ; and between these two points of origin from the 

 upper and inner surface of the fascia connecting the cora- 

 coid, clavicles, and sternal rostrum. (See Descriptions of Pre- 

 parations, p. 22.) Its tendon, which is joined by that of the 

 subscapularis, is inserted proximally and anteriorly to that 

 of the preceding muscle n. The relations which these 

 muscles hold to each other are much the same as those 

 subsisting between the obturator extcrnus and internus, 

 with which these muscles are serially homologous. 



w. One head of the extensor plicae alaris anterioris longus, 

 arising from the upper end of the clavicle in continuity 

 externally with a head of the extensor brevis. These 

 muscular bellies appear to be divarications of the deltoid, 

 and to be serially homologous with the outer head of tlie 

 pectineus of anthropotomy. 



tv. Muscle in connection with the long alar extensor tendons. 

 Its fibres have in the natural condition of the parts mucli 

 the same direction as those of the muscle w and of tlie 



N 2 



