263 



THE MORPHOLOGY OF THE MUSCLES OF THE 

 SHOULDER-GIRDLE IN MONOTREMES. 



By W. J. Stewart McKay, M.B., M.Ch., B.Sc. 



(Plates xx.-xxiii.) 



The observations contained in this paper were made in the 

 Anatomical Laboratory of the Medical School of the Sydney 

 University. The subject was suggested to me by my friend and 

 former teacher Professor J. T. Wilson, who not only allowed me 

 to work in his private laboratory, but also supplied me with 

 abundant material. I take this opportunity of thanking him, 

 not only for the material, but for his advice throughout the work; 

 and if this paper has any merit it is entirely owing to his guidance 

 and teaching. I do not, however, wish it to be understood that the 

 opinions herein expressed are necessarily those that Professor 

 Wilson holds. 



[ have to thank Professor Haswell for a fresh specimen of 

 Ornithorhynchus, which he was good enough to present to me. I 

 am also indebted to Mr. J. J. Fletcher for the loan of Coues' 

 paper on Ornithorhynchus. 



With regard to the literature on the myology of the Monotremes, 

 I have been able to consult all the chief papers with the exception 

 of one by Fewkes (5). 



Of the various writers who have contributed to our knowledge 

 of the subject, Meckel (13) was the first to publish, in 1826, a 

 complete desci'iption of the muscles of Ornithorhynchus. His 

 work, written in Latin, will ever remain as a book of reference. 



