18 



EXPLANATION OF PLATE II. 

 Sections through left Glenoid Fossae (natural size.) 



E =Eminentia articularis. 

 G = Glenoid fossa. 

 F =Glaserian fissure. 



1. European, adult cT 



2. European, adult c? 



3. Eskimo, adult cf 



4. Eskimo, adult <f 



5. Eskimo, adult 9 



6. Australian native, adult d" 



7. Australian native, adult cT 



8. Sinhalese, adult d" 



9. Chimpanzee, adult 9 

 10. Gorilla, adult d" 



Casts were taken of the left glenoid fossa in a series of crania. These 

 casts were then sawn through in the sagittal plane a little to the left of the 

 deepest part of the Glaserian fissure. This corresponded approximately 

 to the middle of the glenoid fossa. From the section of the fossa and eminentia 

 articularis thus obtained, the above diagrams were drawn: one section of 

 each cast was placed flat upon the paper, and a pencil run round the edge, 

 starting from just behind the Glaserian fissure and ending at the anterior 

 limit of the eminentia articularis. 



Nos. 1 and 2 illustrate the deep glenoid fossa and high and prominent 

 eminentia articularis in modern civilized man. 



Nos. 3, 4, and 5 illustrate the shallow fossa and flattened eminentia in 

 the Eskimo. 



Nos. 6 and 7 are examples of shallow fossae in two Australian crania. 



No. 8 is a section through the glenoid fossa of a Sinhalese from Ceylon 

 and is remarkable for its depth. This is what one would expect from a people 

 who subsist mainly upon a vegetarian diet. 



Nos. 9 and 10 illustrate the shallowness of this fossa in the anthropoid 

 apes. 



