189T.J NEW YORK ACADEMY OF SCIENCES. 359 



between the Ti'iceps dorsfid and Brachialis anticus ventrad. 

 This portion is perforated by the musculocutaneous nerve. 



3. Coracobrachialis inferior separates from the preceding 

 as a prolongation distad of the lateral border of the muscle ; 

 it forms a slender muscular bundle, descending on the medial 

 intermuscular septum between Brachialis anticus and Triceps, 

 passes beneath the Radial artery (high division of Brachial 

 arter}') and superficial to the Ulnar-interosseous artery and 

 Median nerve, to be attached to the lateral extremity of the 

 bony arch completing the Supracondylar foramen, close to the 

 mesal margin of the Brachialis anticus. 



Murie and Mivart (1, p. 33, 34) describe onl}^ two portions of 

 the Coracobrachialis in Lemur catta, the long part arising ex- 

 clusively from the "inner side and deep surface of the strong 

 inner head of the Biceps," no muscular fibres arising from the 

 Coracold process itself. Narrowing rapidly in descending the 

 muscle is inserted into the mesal border of the humerus, as far 

 down as the proximal border of the perforation of the internal 

 condyle. 



The short part — which is very small — arises from the end and 

 deep surface of the Coracoid process, and is inserted on the dor- 

 sal aspect of the mesal margin of the Bicipital groove, between 

 the insertion of the Teres major and the high-reaching mesal 

 portion of the Triceps. 



The longhead, reaching down to the supracondylar arch, cor- 

 responds to Wood's Coracobrachialis lonqiis.^ 



Meckel finds the muscle divided in the Makis. Murie and 

 Mivart (1, p. 34) found the muscle double ia L. nigrifrons. 

 The long portion arose tendinous from the Coracoid, and con- 

 tinued so, mingling with the fibres of the second portion, to the 

 middle of the humerus, w^hen it became fleshy. Insertion upon 

 the supracondylar arch. 



In Galar/o crassicaudatus the authors figure a long strong and 

 a shorter 'weak belly (PL II., fig. 3; PI. III., fig. 5; PI. lY., fig. 

 14, cb^ and cb^) as entirely distinct, the former arising b}'- a 

 slender tendon in common with the coracoid head of the Biceps, 

 the latter constituting an insignificant bundle passing from the 

 Coracoid over the insertion of the Subscapularis to the medial 

 tubercle of the humerus. 



The muscle also has a second slip in Galago allenii and G. peli, 

 the two parts " having much the same origin and insertion as in 

 L. catta.''^ 



Two portions are also found in Loris gracilis and Nycticebus 

 tardigradus (5, p. 244). Yan Campen (3, p. 33) describes the 



•Journ. Anat. Phys. 1867, Vol. I., p. 49. 



