210 PROCEEDINOS OF THE NATIONAL MUSEUM. vol. xxxii. 



CEREBELLAR FOSSiE. 



1 (n) The right- cavity whows a greater average absolute length in adult white 

 males and in the Indian male dolichocephals, but is shorter than the left in the 

 adult male as well as in female negroes. Among brachycephals, white and Indian, 

 the differences are immaterial. 



(6) In human fetuses and young in anthropoid apes, monkeys, and lemurs the 

 left fossa is more often the longer. 



((') Correlation between the length of the cerebellar and any of the individual cere- 

 bral fosspe is nil, or very limited. 



2. In the largest skulls the cerebellar fosspe are relatively shorter than in the small- 

 est crania. 



3 {a) The mean length of the cerebellar cavities is, relatively, somewhat smaller 

 in the human young than in adults. 



{h) It is like in man in the chimpanzee and orang, but is smaller in the gibbon, 

 and especially so in the monkeys and lemur. 



(c) Sexual differences are quite immaterial. 



(d) As to races, the fossae are relatively nearly alike in the whites and the 

 negroes, but are longer in the Indians; finally, 



{e) The relative length of the cerebellar foss;e is greater in all the series of 

 brachycephals than in dolichocephals. 



With all the four fossfe, and in all series, that cavity which is inore often the 

 longer than its mate of the opposite side shows generally also a larger range of the 

 excesses of measurement. 



If the above results of the studies on the skull are now applied to 

 the brain itself, i. e., to those parts of the brain represented by the 

 measurements taken, the indications are that — 



In hur/uni adults^ in general, the cerebrum presents in the majority 

 of cases a greater basal length (as obtained by the measurements here 

 dealt with) on the left side; the length of the frontal lobe is some- 

 what greater on the right than on the left side; the length of the 

 parietal lobe is slightly greater than that of the frontal, and in most 

 instances is also sllghth' greater on the right than on the left side; 

 compensation in length with the frontal lobe appears to be very lim- 

 ited; the length of the occipital lobe is decidedly greater than that of 

 the frontal or that of the parietal lobe (with the former as nearly 1.5 

 to 1, with the latter as over 1.5 to 1); and it is decidedh' greater, in a 

 large majority of brains, on the left side; there exists frequently a 

 compensation in length between the two more anterior lobes and the 

 occipital; the length of the cerebellum is smaller than that of the 

 occipital lobe, but is always in excess of that of either the anterior or 

 the middle lobe of the cerebrum; the right lobe shows in some of the 

 series (whites) a prevalence of greater length on the right side; in 

 others (negroes) on the left side; no correlation appears between the 

 length of the cerel)ellum and that of the occipital, or any other portion 

 of the cerebrum; the largest adidt human brain shows a relatively 

 smaller length of the anterior lobes than do the smallest specimens; 

 with other portions of the organ the differences in this respect are 

 irresfular. 



