CURVE OF SPEE IN MAMMALS 
181 
transferred with a knife to the margin of the modelling compound as 
is shown in figure 6 (1 and 2). The modelling compound was now 
removed from the fossa and the line of the fossa, including the two 
knife marks, made for the purpose of obtaining the angle of the in- 
cUnation of the fossa, as well as the line of articulation, were stamped 
on a sheet of paper with the aid of painting ink. The value of the 
Fig. 6. The Cast, Showing the Outlines of the Glenoid Fossa, Obtained by 
THE Method of the Author (Actual Size) 
All of the fossae thus outlined were taken from the right side of the skuU. The heavy 
line (PQ) is parallel to the line of articulation. The angle PQ is the angle to be measured. 
A, from the skull of man (Specimen 15613) angle 32 degrees; B, from the skull of orang 
utan (Specimen 7064) angle 24 degrees; C, from the skull of Hylobates (Specimen 12074) 
angle 8 degrees. 1 and 2 are two marks made with a knife, indicating the limits of the 
area. 
angle between the line of articulation and the Hne which connects 
the two marks was obtained by the use of a protractor. 
Even in the cases of the other animals this same method may be 
applied either directly or with some slight modification. 
The results of these determinations are given in tables 2-16, 
except 9, 14, and 16. The averages are given in tables 17 and 18. 
