344 SHOULDER-GIRDLE IK MONOTREMES, 



scapula, and on the inner border and surface of the acromion and 

 the distal part of the dorsal face of the clavicle ; the trapezius 

 being placed antero-externallj, and the serratus magnus postero- 

 internally, and omohyoid ventro-internally to the insertion. 



Innervation. Echidna : Dorsal portion, ii. cervical nerve; 

 ventral portion, iii. cervical nerve. Ornithorhynchus : Both por- 

 tions, iii. cervical nerve. 



Westling — Echidna : " Die beiden Theih des Muskels werden 

 von den Aesten der 2 und 3 Halsnerven." 



Echidna. 



Westling, under levator clavicular, says — "This muscle is well 

 developed and is divided into two portions, which are intimately 

 related along the mid-line at their origins. One portion arises 

 from the ventral surface of the atlas and the transverse process of 

 the following vertebra, and is inserted on the acromion and the 

 clavicle. The other portion arises from the basis cranii " caudal 

 vom Ohre und dem Foramen jugulare," and is inserted on the 

 anterior part of the vertebral border of the scapula. The nerve 

 supply to both portions of the muscle is from the ii. and iii. cervical 

 nerves ; the same nerves supplying the rhomboid. 



Leche follows Westling. 



MiVART says, under levator claviculse (?) — "There are two flat 

 and rather thin bands of muscular fibre which are closely connected 

 at their origin, and together appear to represent this muscle." He 

 then describes the muscles ; the superficial one being thin, which 

 is inserted on the clavicle. 



Ornithorhynchus. 



Owen does not mention this muscle. 



CouES says — "We have two distinct mu.scles, both arising from 

 the spine of the atlas hypapophysis, but with sepaiate scapular 

 attachments ; each of these is a single belly." He then describes 

 the two parts under the names " atlanto-acromialis" and "atlanto- 

 scapularis." Of the latter muscle he says, " it has somewhat the 

 appearance of an enlarged and distinct fasciculus of the levator 



