BY W. J. S. McKAY. 283 



ECHIDXA. 



Westling : " M. deltoideus ist in zwei nur bei der Insertion ein 

 wenig vereinte Theile getheilt ; der eine entspringt vom Acmmion 

 und dem ganzen niit der Clavicula verwachsenen lateralen Theil 

 des Episternum ; der mediale Theil dieser Portion wird vom M. 

 sterno-mastoideus bedeckt und Hegt kopfwiirts vom M. pectoralis ; 

 inserirt an einer vom Tuberculum majus ausgehenden Crista." 



Westling then goes on and gives a description of the scapular 

 portion and says— " Insertion : ein lateraler Hocker auf der 

 Crista deltoideua, mittelst einer langen Sehne, die zum Theil die 

 erste Portion an ihrer Insertion durchbohrt." As regards the 

 innervation, she says — " N. axillaris ; ausserdem giebt der Ramus 

 cutaneus n. snpracoracoidei einen sehr feinen Faden zum M. del 

 toideus I ab." 



Leche follows Westling. 



MiVART describes two parts, a clavicular and a scapular portion, 



and states that the latter is " inserted into a depression in the 



deltoid crest of the humerus, its tendon being implanted in the 



midst of the fibres of insertion of the first described [clavicular] 



portion of the muscle.' 



Orxithorhynchus. 



Owen says — " The deltoid is divided into an anterior and pos- 

 terior portion. The anterior portion arises from the anterior 

 extremity of the coracoid, and is inserted into the summit of the 

 deltoid crest of the humerus. [This is really the epicoraco- 

 humeral]. The posterior part arises from the anterior and 

 .superior apex of the scapula, and is inserted into the lower half 

 of the deltoid crest." 



Lkche says the clavicular portion of the deltoid is wanting, its 

 |>lace being taken l)y the clavicular portion of the P. major. He 

 describes a scapular portion. 



Meckel describes the clavicular portion as being part of the 

 P. major ; he describes the true epicoraco-humeral as the " Pars 

 deltoides anterior," and he describes the posterior portion of the 

 deltoid, " sine dubio deltoides pars posterior." 



