294 SHOULDER-GIRDLE IN MONOTREMES, 



behind (or rather above) the origin of the coraco-brachialis. I am 

 inclined, however, to regard this muscle as the representative of 

 the subclavius. Meckel is silent as to both, but Owen says that 

 both a pectoralis minor and a subclavius are inserted into the 

 coracoid in the Ornithorhynchus." 



Orn ithorh ynchus. 



Owen — " The pectoralis minor is attached to the coracoid, and 

 the subclavius is likewise inserted as in some other quadrupeds 

 into this bone, which is no longer a subordinate process of the 

 scapula in the Monotremes." 



The above opinion is only a paraphrase of what we are now 

 about to quote from Meckel, and Mivart is therefore in error in 

 saying that Meckel is silent on these muscles. 



Meckel — " Scaleni, forsan et pectoralis minor, irao et subclavius, 

 duobus, ni gravissime fallor, referuntur musculis, parvis, longi- 

 tudinalibus, planis, superiore et inferiore, vicinissimis. [Sterno- 

 coracoideus] Superior, major a sterni manubrio ortns oblique 

 extrorsum ad faciei internse clavicular coracoidese quadratse vel 

 anterioris partem internam posticam adscendit. [Co^to-cora- 

 coideus] Eodem tractu, sed a primse costse cartilagine inferior, 

 minor ad claviculse ejusdem coracoideee faciem internam decurrit. 

 Uterque partem scapularem deprimit, decursu igitur et actione 

 pectoral em minorem sis tit .... Ne quis putet, me, et sub- 

 claviumhuctrahentem,sententiammeamdeossequKdratocoracoideo 

 ipsum impugnare, moneo, in plurimis aniraalibus, etiam mammali- 

 bus, subclavium et a scapula et quidem processu coracoideo oriri,'' 



Coues says — " Pectoralis minor ^ Besides the serratus another 

 plane of muscle connects the shoulder apparatus with the top of 

 the thoi'ax ; it has somewhat the situations and relations of an 

 ' intercostal ' betwixt first rib and the bone above. It is divisible 

 into two parts. One of these, costo-coracoid, is larger and thicker 

 than the other ; it arises from the first rib, from the origin of the 

 serratus magnus slip to the sternal articulation, and is inserted 

 mainly into the base and inner surface of the coracoid. A smaller, 

 thinner plane, manubrio-epicoracoid, expands upon the internal 



