204 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



the right, but this was not always associated with a smaller length of 

 the left postero-inferior fcssa. 



In detail the differences in the cerebellar cavities were distributed 



thus: 



Length of poster o- inferior fossa on the two sides. 



Skulls. 



Adults: 



Whites, males— 



Dolichocephals 



Mesocephals 



Brachycephals 



Whites, females — 



Dolicliocephals 



Mesocephals 



Brai-hycephals 



Indian, males — 



Ddliehoeephals 



Braeliycephals 



Negroes- 

 Males, dolicho- and me.soeephals .. 

 Females, dolicho- and mesocephals 



Human fetuses and young 



Anthropoid apes 



Monkevs and lemur 



Right cere- 

 bellar fossa 

 longer (per 

 cent of 

 cases). 



Fossae equal 

 (per cent 

 of cases). 



Left cerebel- 

 lar fossa 

 longer (per 

 cent of 



eases). 



The results, so far as the human adults are concerned, agree in gen- 

 eral with those shown by the first table of this part of the paper. 

 There is a larger proportion of longer fossa? on the right than on the 

 left side in the white and Indian male dolichocephals, and smaller in 

 the male negroes. Greater numbers of crania, particularly braehy- 

 cephalic, would have been ver}^ desirable in this connection. In the 

 human young, anthropoid apes, and monkeys are seen relatively 

 small percentages of longer right fossa, with larger percentages of 

 longer left fossa and of equal cavities. Comparing the conditions 

 found in the human young with those in adults, it is seen that in a 

 large proportion of cases the excess in length in the right cerebellar 

 fossa takes place after fetal life has been completed. 



The absolute differences in length of the two cerebellar cavities 

 were in some of the skulls quite marked, but on the whole were less 

 than those of the postero-superior fossae. They ranged as follows: 



Absolute differences in length of the cerebellar fossa: ; rigid fossa the longer in cases: 



