33 
hence we have the compound gleno-radial muscle of the ruminants, in 
which, however, as Meckel indicates, a trace of a division may be 
seen,” &c. 
The condition just described is the condition of the biceps in 
Notoryctes, i.e., gleno-radial, but there it presents no trace of its com- 
posite character. 
Amongst Marsupials the same author* describes the condition in 
the Giant Kangaroo and Wallaby as follows :—* The biceps is divided 
into two parts for its entire extent. Of these, the coracoid is gener- 
ally the larger, and seems to be inserted into the tubercle of the 
radius; the glenoid origin is smaller and, ds usual, tendinous; crossing 
the head of the humerus and crossing the coraco-radial muscle, it is 
inserted with the ulna in company with the brachialis anticus, &c.”’ 
“In Didelphys and Phalangista the muscles are similarly 
arranged, as they are likewise in all the other Marsupials which I have 
examined. a 
In Myrmecobius+ the same elements of the biceps are present, but at 
their origin they are fused into a tendon, coraco-glenoid in attachment, 
which is quite outside the capsule of the shoulder-joint. Somewhat 
similar partial union of the coraco-radial and gleno-ulnar elements is 
found in Didelphys and in Chironectes according to Leche,+ while in 
Thylacinust and Dasywrus$ the tendons of origin are separate at their 
commencement. The bellies of the muscle in Cuscus and Phascologalet 
are separate throughout, the tendons of origin being partially fused. 
In Perameles|| there is no coracoidal head, but the insertion is 
radio-ulnar. 
In Echidna Westling’ describes two incompletely separated portions. 
The smaller is epicoracoidal, rising close to the “ epicoraco-humeral ” 
muscle; the larger arises from the coracoid and from part of the 
tendon of the coraco-brachialis longus. Mivart** describes the muscle 
with these origins as a single mass, inserted into both radius and ulna. 
According to Westling it is the smaller epicoracoid portion which 
passes by a long thin tendon to the ulna. 
In Ornithorhynchust + the muscle is bicipital, one head epicoracoidal, 
the other coracoidal. Both are inserted into the middle third of the 
radius. 
In Chlamydophorustt biceps is “aslender muscle which arises by one 
head from the root of “the coracoid process on its inner side at the 
margin of the glenoid cavity,’ It is inserted into a pit in front of the 
coronoid process of the ulna. It is similar in Tatusia.tt 
In Dasypus it has a radial as well as an ulnar insertion, and it has 
sometimes a coracoid head of origin, either independently or from the 
coraco-brachialis muscle, in addition to the constant glenoid one. 
In Cyclothwrust{ the muscle is glenoid in origin, and is inserted partly 
with the brachialis anticus to the ulna and partly into the tubercle of 
the radius. 
In Orycteropus$§ it is gleno-radial, but receives the clavicular deltoid 
*XXxi., page 284. txxvi., page 798. tiv., page 1l. §xxxvi., page 
119. ||xlv., page 12. M[lxii., page 18. ** XXXiX., page 385. ttxlv., 
page 8, and xxvi., page 798. +t} xxvii., page 246. §§ xxvii., page 247. 
Cc 
