782 



MR. ST. GEORGE MIVART ON THE 



[June 27, 



intervening between these, and is inserted into the front of the hu- 

 merus from the head and internal tuberosity to the middle of its 

 shaft. The hmit of its insertion begins above at the insertions of 

 the epicoraco-humeral and pectoralis major, and below is conter- 

 minous with the origin of the brachialis anticus (figs. 8, 9 & 10, 

 C.B. 1). From the extent of its insertion this portion appears to 

 me to answer both to the coraco-brachialis proprius vel medius and 

 to the rotator humeri or coraco-brachialis superior vel brevis of 

 Mr. Wood*. 



Fisr. 10. 



B. 



Flexor surface of right upper arm, the biceps and pectoralis major being 



cut short. 



Biceps. B.A. Brachialis anticus. C.B.I&2. Coraco-brachialis. E. H. 

 Epicoraco-humeral. P. Pectoralis major. S.Z. Supinator longus. r.3&4. 

 Triceps. 



(2) The second, longer portion (figs. 6, 8, 9 & 10, C. B. 2), which 

 seems to aviswer to the coraco-brachialis longus of Mr. AVoodf, 

 arises, by muscular fibres, from the posterior end ai the sternal 

 border of the coracoid, and is inserted into the internal condyle of 

 the humerus and into the shaft of the bone for a very slight distance 

 above that condyle. There is a glistening tendon on the side next 

 to the bone of the lower half of this portion of the coraco-brachialis. 



The biceps (figs. 1, 2, 6, 8, 9, 10 & 1 2, B.) has, as in the Echidna+, 

 but a single hcad§, which takes origin, by a very broad tendon (with 

 an aponeurotic longitudinal interval), from the anterior (not sternal) 

 margin of the coracoid and adjacent part of the epicoracoid, and 

 passes backwards so as to be immediately superficial to the short 

 part of the coraco-brachialis. It soon fuses with the brachialis 

 anticus, and is inserted in common with that muscle (by a very 

 strong tendon, which slightly bifurcates below) into the upper parts 

 of both radius and ulna; but the fibres continuous with the biceps 



* Journal of Anat. and Phys., Cambridge, 186S, vol. i. pp. 48, 49. 



t Loc. cif. p. 49. 



\ Trans. Linn. See. vol. xxv. p. 385. 



§ Unless what I have named brachialis anticus be a humeral head of the hicepa. 



