290 SHOULDER-GIRDLE IN MONOTREMES. 



Leche gives the same description for the muscle as in Echidna. 



CouES describes it under the name of " anterior portion of the 

 deltoid," protesting, however,." that it is overlaid and covered by 

 the pectorulis, and would hardly recall a deltoid by any physical 

 feature." 



Meckel says — " Infra pectoralis partem anteriorem parvus 

 ponitur musculus, quern pro deltoidis parte antica habuerim, ab 

 ossis coracoidei quadrati extremo antico extrorsum^ ad summam 

 ossis brachii cristam anticam descendens." 



CuviER and Laurillard figure it on Plate 266 as -'grand pec- 

 toral, portion profonde dite moyen ou petit pectoral.' 



Remarks. With regard to this muscle, we may dismiss at 

 once the suggestion that it is the homologue of the subclavius. 



Humphry (11) describes in Gryptohrmichus "a broad thin 

 muscle arising from the outer surface of the sternal or epicoracoid 

 edge of the coracoid superficial to the biceps. It crosses the 

 muscular fibres of the biceps superficially and transversely, and 

 converges to be inserted into the summit of the upper part of the 

 radial tubercle of the humerus, just above the pectorah It may 

 be called the epicoraco-humeral." In a note on the above, he says, 

 " it corresponds, I think, with that described under the name in 

 the Echidna by Mivart." In another place Humphry says, " in 

 animals above fishes the coraco-humerals, or, as they are more 

 generally called, coraco-brachials, are commonly divided into seg- 

 ments which vary in number and size with the number and size 

 of the coracoid processes ; and they are sometimes absent when 

 these processes are abortive, as in Mole, Cyclothiirus and Seal. 

 They arrange themselves in two divisions. First, those which lie 

 superficially with regard to the biceps brachii muscle and which 

 pass to the radial tubercle of the humerus immediately above the 

 level of the P. major and also extend beneath that muscle. These 

 constitute a superficial or preaxial division. ... " The fibres 

 of the epicoraco-humeral part of this superficial, preaxial, or supra- 

 bicipital division of the coraco-humerals lie immediately beneath 

 the pectoralis major in its whole course. I have remarked that 



