224 MARSHALL— A STUDY OF THE 



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and forward. The muscle terminates tendinously on the ventral 

 border of the scapula. It divides the subscapularis. 



The large posterior division (Ser. sp.) springs with four scallops 

 or teeth form the second and third dorsal ribs, just below the proc- 

 esses of these ribs. The fibers of these closely-related bundles are 

 directed upward and forward. The most posterior bundle is in- 

 serted on the posterior tip of the scapula. The others do not 

 reach the scapula but terminate on the ribs and the membrane 

 connecting them in this region. 



10. M. serratus profundus (Ser. p., PI. VI, Fig. 26), occupies 

 a more dorsal position than the last mentioned muscle, and is 

 exposed by the removal of the m. scapuli-humeralis posterior. The 

 edges of the two thin portions composing it overlap. The dorsal 

 bundle comes from the free cervical rib at the outer end of the ver- 

 tebral projection. The lower bundle arises from the last cervical 

 rib and from the membrane connecting this and the preceding rib. 

 Both bundles are inserted on the posterior median border of the 

 scapula. 



11. M. sterno-coracoideus (St. co., PI. VI, Fig. 26) is covered 

 at its origin by the abdominal muscles. It arises tendinously from 

 the first, second and third sternal ribs. This small muscle passes 

 obliquely to the lateral projection of the sternum below the 

 coracoid. 



12. M. suhcoracoideus (Sub. co., PI. VI, Fig. 26). This deli- 

 cate fusiform muscle is revealed by the separation of the scapula and 

 coracoid. It springs tendinously from the inner anterior border 

 of the coracoid about one third the length of that bone from its 

 distal end. It is inserted on the humerus proximal to the coraco- 

 brachialis posterior. The fibers of this muscle are closely associ- 

 ated with those of the subscapularis. It differs considerably from 

 Gadow's description. 



C. Muscles restricted to the wing. 



1. M. propatagialis, pars propatagialis musculi deltoidei (Pro.). 

 This includes both the long and short tendons, the other parts 

 being absent. It arises rleshily from the dorsal end of the clavicle 

 and from the neighboring portions of both coracoid and scapula. 

 It is a flat muscle, about 14 mm. long and 5 mm. broad. At its 

 distal end it tapers off into two tendons, the upper and more deli- 



