( 533 ) 
skulls of children under 5 years of age only 2 have a smaller 
angle while of the 23 skulls of children between 5 and 12 years 
of age this is so in 6 cases. From this it may be inferred that 
daring infancy when, as has been shown in the 1 st paper, a 
shifting of the position of the occipital foramen takes place in man, 
also the plane of the For. rnagn. tarns, and in the same direction 
as with the Anthropoids. Yet, as has been said, this turning, like 
the accompanying shifting of position is more marked in Anthropoids 
than in human beings. 
We have now seen twice over that a shifting of the For. magn. 
and a change in the angle go hand in hand during the individual 
development. For in human beings as well as in Anthropoids the 
shifting backwards diminishes the angle of inclination. To what 
degree this relation between these two features exists m comparative 
anatomy will be apparent from the following table. The 2- column 
gives the average of the angle, while the first column shows the 
average basal-index as determined in the 1 st paper. I may here call 
to mind that the greater this index is, the further backwards does 
the For. magn. lie. 
Index basalis. 
Angle of inclination of the 
Lemur albifrions 
87 
(1) 
Propithecus diadema 
80 
(2) 
Myeetes 
86 
(3) 
Pithecia 
74 
(6) 
Hapale 
71 
(8) 
Cebus 
67 
(10) 
Ateles 
64 
(13) 
Chrysothrix 
59 
(18) 
lntius 
65 
(12) 
Cynocephalus 
65 
(12) 
Macacus 
64 
(14) 
Cercopithecus 
57 
(19) 
Seranopithecus 
74 
(7)” 
Colobus 
75 
(5) 
Siamanga 
76 
(4) 
Hylobates 
71 
(9) 
Chimpanzee 
64 
(15) 
Gorilla 
61 
(16) 
Orang 
61 
(17) 
40’ (1) 
42° (2) 
47.5" (3) 
58.5° (4) 
65° (8) 
67.8” (11) 
72.7” (16) 
66 . 6 ° ( 10 ) 
71.2° (14) 
64.2° (7) 
73.8” (17) 
79.2° (19) 
62.8° (6) 
68 ° ( 12 ) 
60.2” (5) 
65.1° (9) 
74.3° (18) 
71.8° (15) 
70.3” (12) 
