70 PROCEEDINGS OF THE NATIONAL MUSEUM vol.73 



Murie reported it in close union with the teres major, and in Oclo- 

 henits he did not succeed in segregating it. 



M. teres major (figs. 7, 9, 21, 22, 23) in the Zalophus arose from the 

 more dorsal part of the axillary border of the subscapularis and by 

 fasciculi from the dorsal quarter or third of the axillary border of 

 tlie bone. The insertion was broadly tendinous at about the middle 

 of the humeral shaft and under cover of the biceps. In the Phoca 

 it arose over practically the entire axillary half of the infraspinous 

 space, including the glenovertebral cartilage. It passed between the 

 triceps and the subscapularis to insert upon the well-defined rugosity 

 in the bicipital groove of the humerus, slightly proximad to the 

 middle. 



M. subscapularis (figs. 9, 21, 22, 23) exhibited complexity of its 

 fibers, as usual. In the Zalophus it arose from the entire medial sur- 

 face of the scapula and even extended over the axillary border, 

 while in&ertion was upon the lesser tuberosity deep to that of the 

 episubscapularis. In the Phoca it was exceedingly massive, and 

 overhung both the cranial and axillary borders. The latter part was 

 partly separable, originating from the ventral border of the gleno- 

 vertebral angle, and might almost be considered as constituting a 

 separate muscle. Insertion of the whole was upon the lesser tuber- 

 osity, in this case larger and more prominent than the greater, a 

 fact due chiefly to the power of this muscle. 



M, episubscapularis (figs. 7, 22), in the nomenclature of which I 

 follow Miller for convenience, is undoubtedly a division of the sub- 

 scapularis and was folded over upon a part of the latter in the 

 Zalophtis only. It arose from the medial coracovertebral angle and 

 border of the scapula and passed over the cranial edge of the sub- 

 scapularis. It developed a tough tendon within the substance of 

 the muscle which branched, one slip going to the lesser tuberosity in 

 company with muscle fibers. The other was attached to a faintly 

 defined groove upon the medial part of the ridge extending distad 

 from this tuberosity and beneath the insertional end of the teres 

 major. Upon this tendon and the adjoining dorsal border of the 

 teres major the remaining muscle fibers inserted. This muscle has 

 been found in all of the eared seals so far dissected, and the walrus 

 also. Murie seems to have considered it to be a derivative of the 

 supraspinatus in his report on Ewmetopias, but listed it as a part of 

 the subscapular for Odohenus. 



M. subscapulo-capsularis (fig. 9) is found in the Phoca only, and was 

 represented by a few fibers arising from the extreme distal part 

 of the subscapular surface of the scapula, with insertion upon the 

 capsule of the joint and the adjoining base of the lesser tuberosity. 

 Miller stated that in Phoca vitulina it arose from the bjise of the 

 axillary border. 



