408 ANIMAL MECHANICS. 



and by the absence of — 



i°. Occipital slip of Rhomboideus. 

 2°. Omo-Atlanticus. 

 3°. Tricipiti accessorius. 

 4°. Pectoralis quartus. 



The following Tables show the relative developement of 

 the various muscles and groups of muscles : — 



Muscular Types of Man and Quadrumans — Shoulder Joint. 







Man. 



Gorilla. 



Chim- 



Hama- 











panzee. 



dryas. 





Scapular Muscles. 



Per cent. 



Per cent. 



Per cent. 







Per cent. 



I. 





9-33 



8-73 



9.98 



7.68 



2. 



Cleidomastoides, . . . . 



2.49 



0. 60 



4-5° 



3-37 



3- 





3-°7 



3.02 



3-75 



3-29 



4- 



Serratus magnus, .... 



7.64 



1 1 30 



I3-7 1 



8 . 46 



5- 



Levator anguli scapulae, . 



1 . 96 









6. 



Omo-Atlanticus, .... 





0. 60 



0.99 



1.70 



7- 





0.19 



0.15 



0. 24 



o.54 





Abductors. 











r. 



Deltoideus, 



15. 32 



14. 02 



8.98 



7 • 45 



2. 





4. 28 



4. 21 



3-49 



2-75 



3- 





2 . 40 



1 96 



2 49 



4. 54 



4- 





4.56 



3-9 1 



3-99 



6. 04 



5- 





1-54 



1 . 20 



1 . 00 



0.77 





Flexors. 











i. 



Triceps longus, 



8. 95 



4-52 



3-99 



9.04 



2. 



Tricipiti accessorius, . . , 







o.74 



1 . 63 



3- 





5.04 



6.92 



5-99 



7 25 



4- 



Latissimus dorsi, .... 



9-35 



12.50 



12. 22 



10. 15 





Extensors. 











i. 





4- 34 



7.68 



5 99 



7-52 



2. 





5 4 6 



5. 12 



3-74 



3.21 





Adductors. 











I. 



Coracobrachialis, .... 



1 . 46 



I . 20 





0.77 



2. 



Pectoralis major, .... 



10.45 \ 



9- 34 





8.95 



3« 



Pectoralis minor, .... 



2. 17 j 



1. 5i 



11 73 



3.61 



4- 



Pectoralis quartus, .... 







0 96 



1 28 





IOO 



100 



IOO 



IOO 







Ox. av. 



()z. av. 



0z. av. 



uz. av. 





Total weight, . . 



7711 



3-32 



401 



25'SO 



