BY W. J. S. McKay 295 



surface of the epicoracoid plate. The first of these may be pec- 

 toralis minor ; the second, subclavius 1" 



CuviER and Laurillard do not show these muscles in any of 

 their figures. 



FuERBKiNGER describes, under the name of M. costo-coracoideus 

 in the Crocodile, a muscle, part of which agrees with the costo- 

 coracuid above described. " Breiter ansehnlicher Muskel an der 

 Unterseite der Brust, der sich aus zwei Portionen zusamraensetzt 

 von denen die laterale von dem Vorderrande der letzten Halsrippe 

 (Rippe des 9 Wirbels) and die mediale von dem Vorderrande der 

 1 sternocostalleiste entspringt. Beide Partien vereinigen sich zu 

 einer hoinogenen Schichte, die breit am ganzen Hinterrande des 

 Coracoids inserirt." Fiirbringer later on notices this resemblance 

 and also its reseuiblance to the subclavius of mammals (p. 788). 



In his description of the Mm. sterno-coracoideus internus super- 

 ficialis et |)rofun]us, Fiii-bringer says, "die Mm. sterno-coracoidei 

 der Monotremen ihrerseits stehen, wie bei der Darstellung der 

 Schultermuskeln der Siiugethiere ausfiihrlich nachgewiesen werden 

 soil, wieder za dem M. subclavius der Marsupialia und Placentalia 

 (bssonders durcli Vermittelung von dessen zu Scapula und Pro- 

 cessus coracoideus erstreckten Varietaten) in nahere Beziehung." 



M. BICEPS. 



Echidna: Two 2Mrts described, Westling, Leche ; one part only, Mivart. 

 Ornithorhynchus : Two parts described, all authors. 



Echidna. 



Origin, {a) Epicoracoid head. — This muscle arises by fleshy 

 fibres from the postero-internal surface of the ventral aspect of the 

 epicoracoid. Running outwards and posterior as a thin band of 

 muscle it passes superficial to the tendon of the rectus at its inser- 

 tion, and the belly then comes into contact with the anterior 

 border of the coracoid portion. (Fig. 4, J^c. i.). 



Origin. (6) Coracoid head. — This arises from the ventral 

 face of the coracoid, from a concave surface situated between the 

 coraco-epicoracoid arthrodia and the coraco-sternal arthrodia ; also 



