NO. 1521. 



MEASUREMENTS OF CRANIAL FOSS.E—HRDLICKA. 



207 



The adult human cerebellum is, therefore, relatively somewhat longer 

 than it is in gibbons and lower primates. 



Sexual differences are insignificant in the whites as well as the negroes. 



As to racial differences, there is a slight excess in the relative length 

 of the cerebellar foss» (as there was with the postero-superior ones) in 

 favor of the Indians. Again in this instance the negroes appear nearer 

 to the w^iites than the Indians. 



Finally, the data show the existence of decided differences in the 

 relative length of the cerebellar fossae between the main cranial forms; 

 the proportion is throughout, even in the yoimg, greater in the brachy- 

 cephals than in the dolichocephals. A somewhat similar condition 

 was seen also with the postero-superior cavities. 



The i-elation of the length of the cerebral to that of the cerebellar 

 portion of the posterior f ossj\? is shown in the last table of this section. 1 n 

 conformity with the separate data concerning the two cavities, the cere- 

 bellar fossa is seen to be relatively longer in all the l)rachycephals than 

 in the dolichocephals. In the dolicho- and mesocephalic fetuses and 

 young the cerebellar fossa is relativeh' shorter than in the adults; in 

 the oiangs and gibbons the relation of the two cavities is nearly as that 

 in man, but in most of the monkeys it shows larger differences. In 

 the lemur, finally, the superior part of the fos.sa shows l)ut a slight 

 excess over the inferior. 



Relation of tlw length of the cerehellar to that of the posterior cerebral {poMero-siiiierior) 



fossic. 



Subjects. 



Num- 

 ber of 



skulls. 



Propor- 

 tion, the 

 cerebellar 

 fossae = 100. 



Adults: 



Whites, males — 



Dolichocephals 



Mesocephals 



Brachycephals 



Whites, females — 



Dolichocephals 



Mesocephals 



Brachycephals 



Indians, males — 



Dolichocephals 



Brachycephals 



Negroes — 



Males, dolicho- to me.socephals.. . 



Females, dolicho- to mesocephals 

 Fetuses and young: 



Dolicho- and mesocephals 



Bnichyccphals 



AnthroiMiid apes: 



Chimpanzees 



Gorilla 



Orangs 



Gibbons 



Monkeys, etc.: 



('l/IIOfl'll/KllllH 



3iaC((t'U!i pdups 



Cet>us liypoleucus 



Mycetcs. 



Alouata senicula 



Midas 



Lemur varius 



129 

 127 

 124 



129 

 12(5 



12.5 



127 

 125 



124 

 126 



134 

 12() 



116 

 140 

 124 

 125 



1.58 

 135 

 149 

 140 

 120 

 143 

 108 



