MR 



ON DASYPUS SEXCIN< 11 



;7 



cess in company with the tendon of insertion of the brachial uutUm. * hkh is fix, 

 slightly anterior to it and to its outer side. 



Meckel makes no mention of the termination of this muscle in Jk <«pm, but remark 

 that its ordinary head, which is very short, receives on to Inferior aspect a much slight, 

 offset from the coraco-brachialis. In the Anteater, a« -ordin- the .ma anatomist, tli 



long head soon divides into two branches, the anterior of which i* inserted into tin- 

 radius, while the posterior terminates at the ulna, after fusing with the brachial! 

 anticus\ In Macropus ruficollis (var. Bemiettl) this muscle, which is ungle-hoadcd, 

 divides at the termination of the upper third of the arm into two e.,ual-sizcd factors, 

 the anterior of which arises from the inner (or superior, as it lies in the bicipital groove) 

 edge of the tendon; while the inner branch, into which is continued a rounded mode- 

 rately thick tendon, arises from the inferior or outer ease, of whi h this rounded tendon 



is a continuation. The anterior division, at the inferior third of the arm, takes an 

 external position, and is finally inserted by a broad tendon into the neck of the radius 

 while the posterior, occupying the inner position, terminates at the ulna. 



Meckel describes this muscle, in31acropus gigaulev* (" Rieeenkanguinli"), as dividing 



•the superficial division passing to the radius, the deeper to the ulna, where is also 

 inserted the brachialis anticus, quite distinct, however, from the former muscle. In the 

 Opossum, according to the same anatomist, the reverse takes place, the muscle consist in- 

 of two heads above, which soon unite lower down into one thick belly 2 . 



Mr. Mivart describes, in Echidna kystrix, the existence of an ulnar afl well as a radml 

 termination to the biceps 3 . In the Ornithorhynchus, on the other hand, according to 

 Meckel 4 , both heads of this muscle "setzen sich vereinigt sehr giinstig Behnfa des 

 Schwimmens an die Mitte der Speiche." According to Mr. Mivart, the biceps of Iguana 

 tuber culata, among Lacertilia, has an insertion into both radius and ulna''. 



Dr. Macalister, in a recent paper, states that the biceps is single-headed in Das?/pn$ 

 septemcinctus, but also remarks, in a foot-note, that both he and Dr. llaughton have 



examined Armadillos (species not given) in which this muscle lias two heads'. 



Brachialis anticus — This muscle, which is not figured by Cuvier in his plat< 9 of th. 

 myology of the Armadillo, is of considerable size and length, having a very high origin 

 It arises, by a completely fleshy origin, from the neck of the humerus, posteriorly and 

 externally, in the space intervening between the roots of the two tuberosities of the bone, 

 being completely covered at origin by the thin tendinous origin of the outer head of tin 

 triceps. It also arises from the whole external aspect of the humerus, included bet ween 

 its anatomical neck and the groove of the musculo- spiral nerve, besides implanting a few 

 fibres in the outer and anterior overhanging edge of the large deltoid trochanter. It 

 then passes, having close to its inferior edge the musculo-spiral nerve, also the extensiv. 

 origin of the extensor carpi radialis on its outer side and the biceps on its inner, into 



1 Op. cit. p. 520. 2 Op. cit. p. 522. 3 Trans. Linn. Soc vol. xxv. p. .>,;. 



4 Op. cit. p. 520. 



' " On the Homologies of the Flexor 

 bridge, 1808) vol. i. pp. 285 and 289. 

 headed bicept. 



June 



Limb 



The seven-banded specimen which I examined at Oxf< 



