497 



is inserted into the inner side of the back of the head of the humerus, 

 in front of the insertion of the subscapulars. 



n.ni -\ 



0-01 oz. 



10. M. subscapular is, O'Ol 



0-01 1 

 0*01 j ' 



Origin from the inner and lower border of the scapula, half an inch from 

 glenoid ; inserted into the top and back of the inner side of the head of 

 the humerus, inside the insertion of the spinati. 



10. M. serratus magnus, 0*14) n 1 1 e- 



\ 0-09/ • • 0 ' 115 0Z - 



rises from second and third ribs in the usual manner, and is inserted 

 usual. 



11. M. biceps humeri. 0*01 1 A Ari _ 



0-04 j • • °' 025 oz - 



The Eev. Samuel Haughton, M. D., Fellow of Trinity College, 

 Dublin, read the following paper : — 



Notes on Animal Mechanics. 



!No. XT. — Muscular Anatomy of the Ehea (Struthio Rhea). 



I am indebted to Mr. Thomas Moore, Curator of the Derby Museum of 

 Liverpool, for the opportunity of dissecting the Ehea, which forms the 

 subject of this notice. It was a male bird, and seemed to be in good 



condition. 



A. — Muscles of the Hip and Knee Joints. 



1. M. psoas magnus, none. 



2. M. iliacus, none. 



3. M. pectinceus, 0*12 oz. 



Arises immediately in front of the acetabulum (Fig. 32, p.), and is in- 

 serted into the top of the linea aspera. 



4. M. adductor brevis, none. 



5. M. adductor magnus, 2*60 oz. 



Arises from the lower border of the ilium, forming the upper margin of 

 the ischiadic foramen, y (Fig. 32), and the prolongation of this bone 

 backwards in conjunction with the ischium (Fig. 32, ad. mg.) ; it is 

 partly inserted into the top of the linea aspera, and partly into the tendon 

 of the semimembranosus that is attached to the femur ; the tendinous 

 slip that joins these muscles helps them both to pull on the same tendon 

 at the back of the femur. 



