58 Prof. A. Macalister on the Myology 



and Pteropus javanicus'^. The same arrangement occurs in 

 many birds, except tlie Strutliionidte and some of the Natatores. 

 The humeral head also appears in the human leg as an element 

 in the biceps flexor cruris. 



The scapular biceps arises from the upper part of the sca- 

 pula, immediately above the glenoid cavity, external to the 

 root of the coracoid process ; it passes over and does not pierce 

 the capsular ligament of the shoulder-joint, and is, as before 

 mentioned, not at all connected to the last muscle. It is in- 

 serted into the ulna by a distinct strong tendon. This gleno-T 

 ulnar biceps is not bound down into a groove at the upper 

 part of its course, as in Dasypus : in that animal its insertion 

 is both radial and ulnar. In two Armadilloes dissected by me 

 there was no origin from the coracoid process ; but in one 

 dissected during April 1868 a slender band sprang from that 

 process, and so the muscle was a true biceps. The biceps has 

 a single head in the Two-toed Anteater, but is radio-ulnar in 

 its insertion. It has a glenoidal and a deltoidal origin in the 

 Orycterope, and is purely radial in its insertion. In Myrme- 

 cojphaga tamandua it has one head from the glenoid cavity, 

 one from the coracoid process arising in common Avith the 

 coraco-brachialis, and a third from the humerus. In the 

 Great Anteater, Pouch et describes two heads, glenoidal and 

 coracoidean, the latter being closely united to the coraco- 

 brachialis at its origin, (For some notes on these flexors see 

 Journ. of Anat. and Phys. 1868, p. 285.) 



The brachialis anticus arises from the anterior and inner 

 side of the humerus, and is inserted by equal tendons into the 

 radius and the ulna, its radial attachment being slightly con- 

 nected to the radial insertion of the humeral part of the biceps, 

 and its ulnar one being placed behind the insertion of the 

 gleno-ulnar muscle. This muscle seems not to have a sepa- 

 rate existence in the Anteaters, except in the Great Anteater, 

 in which Pouchet described it as present. Rapp describes it 

 as undeveloped in Myrmecophaga tamandua\ and Meckel says 

 it has not a separate existence in Myrmecophaga didactyla. 

 In OrycUropus it receives a slip from the biceps (Humphry), 

 and sends a small slip to the radius (Galton). Meckel de- 

 scribes it as being purely ulnar in its insertion in Bradypus 

 tridactylus. In the Armadillo it is very large, and is purely 

 ulnar in its insertion. 



The triceps arises by a scapular and two humeral heads 

 separated as usual by the musculo-spiral nerve. In the Ant- 



* Prof. Humphry describes the biceps as possessing two coracoid heads 

 in Pteropus Edumrdsii, and without a humeral head (Journ. of Anat. and 

 Phys. vol. ill. p. 303). 



