CONNECTED WITH THE SHOULDER-JOINT. 



133 



Mr. Mivart's ilio-peroneal seems to me to have its serial homo- 

 logue in the muscle which, in many mammals, passes from the 

 posterior vertebral angle of the scapula down to the olecranon, and 

 which seems to be a divarication of the more commonly found 

 'dorso-epitrochlien.' As this muscle is clearly one of the series 

 made up of the biceps, semimembranosus, and semitendinosus, 

 which, like itself, take origin, in Crocodilidae, from the ilium, it 

 may be suggested that in the muscle just mentioned, as found in 

 certain mammals, among which I may specify the marten (Mudela 

 martes), may be contained the homologues of the biceps, semimem- 

 branosus, and semitendinosus, as well as the ilio-peroneal of the 

 lower limb. This great increase of the number of the muscles of 

 the lower, as compared with that of their homologues in their upper 

 limb, is illustrated also by the great excess which the number made 

 up by the adductores and the obturatores shows when compared 

 with that of their homotypes the coraco-brachiales. It furnishes us 

 with a fresh illustration of the principle laid down by Mr. Parker 

 (' Shoulder-Girdle/ p. 7, note), to the effect that * the hip-girdle is 

 always, in the higher classes, more complete as to mere mass, and 

 lower in type morphologically, than the shoulder-girdle.' 



Tabular View of Muscular Homologies suggested in this Paper. 



