1897.] NEW YORK ACADEMY OF SCIENCES. B55 



E. M. SUBSCAPULARIS. 



(PI. XXIX.-XXXI.incl., PI. XXXII., fig. 1.) 



The muscle presents a well marked division into a central; 

 and a cephalic and caudal marginal portion. 



The former is covered by a dense aponeurotic lamina, broad 

 near the vertebral border with fibres converging toward the 

 glenoid angle. The lateral termination of the central portion is 

 overlapped and concealed by the convergence of the cephalic 

 and caudal marginal portions. 



The cephalic marginal division is markedly bipennate in 

 structure. It arises from the cephalic portion of the subscapu- 

 lar fossa, from the cephalic border of the scapula to within a 

 short distance of the base of the coracoid process, and has also 

 a well marked origin from the aponeurotic septum between it 

 and the Supraspinatus, the two muscles projecting beyond the 

 cephalic margin of the Scapula, with a common septum inter- 

 posed in prolongation of the scapular margin. 



The continuation of the entire muscle passes below the medial 

 margin of the coracoid process and the beginning of the Cora- 

 cobrachialis and short head of the Biceps, to be inserted into the 

 upper part of the internal bicipital crest and the lesser (ulnar) 

 tubei'osity of the humerus, the tendon of insertion being in- 

 timately connected with the capsule of the gleno-humeral joint. 



Murie and Mivart (1, p. 29) state that the muscle is very 

 broadh^ inserted into the ulnar tuberosity of the humerus in L. 

 catta and L. varius; they figure the muscle in Galago crassicau- 

 datus (PL III., fig, 5, and PI. IV., figs. 13 and 14, S). 



Burmeister (6, p- 49, tab. 3, figs. 1-13) describes the muscle in 

 Tarsius as being very strong and partially divided into three 

 portions by tendinous intersections. 



Owen (8, p. 59) describes the origin in Gheiromys as taking 

 place by means of three principal fasciculi. 



Murie and Mivart (1, p. 29) state that in the specimen ex- 

 amined by them this subdivision was indistinct. 



The tripartite arrangement of the Subscapularis appears to be 

 a lemuroid character, presenting the typical arrangement of the 

 muscle, as it is found in the higher Primates, in a well-marked 

 manner. 



F. M. Deltoideus. 



PI. XXXII., fig. 2 ; PI. XXXIII. 



Divisible into three portions, clavicular, acromial and scapular 



(spine). ^ pm 



The clavicular origin (PI. XXXII., fig. 2, D^) occupies'the 



