388 ON THE SCAPULA IN MONOTREMES. 



Fig. 5. — Typical mammalian. 

 Fig. 6. — OrnithorhynchiLs. 

 Fig. 7. — Echidna. 

 Fig. 8. — Myrmecophaga. 



Lettering thus in Jigs. 5-8 : — 

 A. — Mesoscapular border (spinous). 

 B. — Prescapular border (anterior or eoracoid). 

 C. — Postscapular border (posterior or glenoid). 

 D. — Subscapular (?) ridge. 



Lettering of figs. la-4a. 



Ac. Tr.' — Acromio-trachelien insertion of dorsal part. Ac. Tr." — 

 Acromio-trachelien insertion of ventral part. Glav. Belt. — Clavicular part 

 of deltoid muscle, origin. Lif. Sp. — Infraspinatus origin. O.H. — Omo- 

 hyoid. Rh.' — Rhomboid, ant. part. Rh." — Post. part. Sc. Belt. — Origin 

 of scapular deltoid. Ser. Mag. — Ins. of cervical part of serratus magnus. 

 S. M. Cost. — Ins. costal part. Sh. Sc. — Origin of subscapularis on ' inner ' 

 surface. Sub Sc. — Subscapular origin on 'outer' surface. Sup. Sp. — 

 Origin of supraspinatus muscle. T. Major. — Teres major, origin. T. 

 minor. — Teres minor, origin. Triceps L. H. — Scapular triceps, origin. 

 Trap.' —Ant. part of trapezius. Trap." — Post, part of trapezius. 



N.B. — Figs. 1-4 are from drawings from nature by Mr. G. H, Barrow. 



