BY \V. J. S. MtKAY 



359 



which muscle it may give a very small branch, and it then 

 comes to the surface and ramifies on the clavicular deltoid. 

 The deep layer of the insertion of the deltoid is shown [Dlt. 

 Cx ) and between this deep layer and the superficial layer 

 (J)(f. C.) is seen the insertion of the scapular portion of the 

 deltoid (Blf. S.). 



Fig. 9. — {Ornithorhynrhns). The P. major and panniculus {Pn. D. ii.) are 

 seen inserted on the humerus. The two parts of the biceps 

 (Be. i., Be. a.) are reflected, and the broad coraco-brachialis 

 brevis is shown. The posterior portion of the latissimus 

 dorsi (Lt. D.P.) is shown with the dorso-epitrochlear arising 

 from it iD.Ep.), and the insertion of this portion of the 

 latissimus is seen to be nearer the proximal end of the 

 humerus than that of the anterior portion of the latissimus 

 (Lt. D. A.). 



Fig. 10. — {Echidna). The posterior portion of thetraiezius {Tr. P.) is 

 seen inserted on tlie vertebral border of the scapula, in close 

 connection with the insertion of the anterior portion [Tr. A.). 

 The origin of the scapular deltoid is seen (Dlt. S.) The 

 scapular portion of the triceps hides the course of the sub- 

 scapularis (S.Sc), scapular part of the latissimus [Lt. 

 D. S.), and the anterior dorsal portion of the same muscle 

 (Lt. D. A.). 



Fig. 11. — (Echidna). Tlie origin of the posterior portion of the latissimus 

 is seen (Lt. D. P.), also the origin of the trapezius (Tr. P.) 

 and the dermo-dorsi-cervicalis part of the panniculus (D. 

 D. C). The saci-o-lumbalis is shown [S.L). 



Fig. 12. —(Ornithorhynchns). The trapezius (Tr. P.) is seen arising from 

 the vertebrte and from the ribs, and in close connection with 

 the latter origins are the slips of origin of the dermo-dorsi 

 cervicalis (D.D.C.). The posterior portion of the latissi- 

 mus (Lt. D. P.) and the dorso-epitrochlear (D. Ej).) arising 

 from it, and inserted on the sheath of the flexor carpi 

 ulnaris, are represented, while the anterior portion of the 

 latissimus (Lt.D.A.) is seen to be superficial to the 

 posterior portion, and to be inserted at the distal part of 

 the humerus. The scapular and humeral parts of the 

 triceps are seen ; also the scapular part of the deltoid (Dlt. 

 S.)\ the teres major (T.M.), subscapularis (S. Sc), and 

 the costal portion of the serratus magnus (Ser. M.), and part 

 of the rhomboid (Rb.). E. S. is an erector spina? : D. L. P. 

 dorso-lumbar aponeurosis. 

 — (Echidna). 

 — (Echidna). This figure was drawn from another specimen, and 



it shows considerable variation from Fig. 13. 

 (Echidna). This is taken from Westling. We have substituted 



numbers for the letters of the original figure. 

 — (Ornithorhynchus). 



—(Ornithorhynchvs) from Westling. C", branch to panniculus. 

 C '.branch to integument. CI. N. to the M. biceps, M. 

 coraco-brachialis, and M. epicoraco-biachialis. dlt. N. 



