272 SHOULDER-GIRDLE IN MONOTREMES, 



(Westling), is inserted in the tuberculum niajus humeri by a 

 common tendon. 



Both the last-named muscles are flexors of the anterior extre- 

 mity. 



5-7. MM. dermo-extensores hrachiales, internus inferior et superior 

 arise from the panniculus in the cervical region, and run to be 

 connected with the ulna, carpus, and panniculus, which covers 

 these parts. 



8. M. dermo-cervicis triangularis arises in the dorsal middle 

 line over the fore part of the anterior dorsum of the trapezius, 

 and is inserted into the ulna. 



Ornithorhynchus. 



CouES gives a full acount of the panniculus, portion of which 

 we extract : — 



" Pannicidus : its special Sli^is and Attachments.— An hyo- 

 dermal muscle is thus formed : over the episternal bar^ a curved 

 fan or horn-shaped set of fasciculi are developed from the inner 

 surface of the panniculus ; these curve inward as they pass for- 

 ward, narrowing to a definite fleshy insertion into the body of the 

 OS hyoides, on either side of its median line, in mutual apposition. 

 A brachic-dermal is formed over the latissimus and side of the 

 thorax generally, by a heavy reinforcement to the inner surface of 

 the muscle of a broad fan-shaped plane growing thicker and 

 narrower as it passes forward to definite insertion (fleshy, or by a 

 very short tendon on the pectoral crest of the humerus, alongside 

 the insertion of the P. major. . . . The costo-dermal fasci- 

 culus arises from the 12th-13th ribs, respectively 1' and l^' from 

 the backbone, and forms a long slender flat jibbon, that runs 

 straight up the side of the body along the anterior border of the 

 lower trapezius, underneath the main plane of the panniculus, 

 lying upon the latissimus to the shoulder; passing just behind the 

 elbow ; widening over the shoulder, becoming then blended with 

 the panniculus along the side of the neck, then separating again, 

 and finally inserted into the back part of the cheek-pouch." 



