298 SHOULDER-GIRDLE IN MONOTREMES, 



CouES divides tlie two heads undei- the names epicoraco-radialis 

 and coraco-radialis, "this latter becomes penniform by insertion 

 into the tendon of the other head of the biceps ; posteriorly the 

 muscular fibres nearly reach the radius. The common insertion 

 of the two is by a broad flat tendon into the middle third of the 

 radius." 



Meckel says — " Margini musculi, supra secundo loco descripti, 

 et pro deltoide antico habiti, intimo apponitur musculus longe 

 tenuior, sed longior, ex parte intima faciei extern je ossis coracoidei 

 majoris, anterioris versus ipsius extremum inferius, oriundus. 

 Decurrit infra cristam ossis brachii pectoralem et ten dine terete 

 inseritur radii superficiei flexorise circiter in media ipsius ab utro- 

 que extremo distantia. Infra hunc musculum ab imo extreme 

 inferiore atque externo claviculse coracoidese posterioris, hie cum 

 coraco-brachiali sueto more arctissime junctus, oritur musculus 

 decuplo crassior, sed brevior, extremo anteriore recti abdominis 

 ab eodem separatus. Infra ipsuin decurrit tendo ipsius externus 

 et inferior tendini ejusdem unitus radio circiter medio inseritur, ut 

 uterque unum reversa sistat musculum, bicipitem, qui et decursu 

 et actione bicipitem hominis nonnullorumque mammalium refert." 



CuviER and Laurillard, in Plate 268, fig. 3, give a figure of 

 the biceps, with the letter (r) affixed, "biceps ou long flechisseur 

 de I'avantbras (scapulo-radien, poi'tion coracoidienne et portion 

 bicipitale)." 



M. CORACO-BRACHIALIS et M. EPICORACO BRACHIALIS. 



Echidna : M. coraco-brachialis longus et hrevis, Mivart, Leche, Westling; 

 M. epicoraco-brachialis, Westling, Leche. Described but not named by 

 Mivart. 



Ornithorhynchus : M. coy-aco-hrachialis .mperior et inferior, Owen, 

 Meckel ; Coraco-brachialis avd epicoraco-brachialis (the latter includimj the 

 coraco-brachialis hrevis), Coues. 



Echidna. 

 Origin, (a) J/, coraco-brachialis longus. (Fig. 4, Cb. L.). — 

 This muscle arises from the postero-internal portion of the ventral 

 aspect of the coracoid, and from the posterior border of that bone. 



