NO. 1521. 



MEASUREMENTS OF CRANIAL FOSS.E—HRDLICKA. 



205 



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



<il=5.5 mm.; 1=11 mm. 



In human adults the scales of inequalities are very nearly alike; in 

 the fetuses, and to a lesser extent in the apes, the differences on the 

 left side are more pronounced than those on the right. 



The relation between the mean length of the cerebellar fossa? and 

 the size of the skull (estimated on the base of the mean of the greatest 

 cranial length and breadth) is indicated in the next table, the skulls 

 represented being the same as with the cerebral fosste in similar 

 comparisons: 



Average relation of the mean lengtli of the two postero-inferior ( cerebellar) fossic to the greatest 

 dorsal and mean ventral length of the skull {each of these diameters being taken as 100) in 

 tlie largest and smallest skulls of the series. 



Except in the Indian males, the fossti? in the smallest crania are in 

 all the groups relatively longer than those in the largest skulls of the 

 series, which means that the cerebellum increases in length in a 

 slightly lower ratio than the skull. It is rather remarkable that the 

 negroes show in this respect, as on many former occasions, nearer the 

 whites than the Indians, while in many external features of the skull 

 the Indians are intermediary between the two. 



