192 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXII. 



The conditions are irregular. The length of the middle foss« in 

 the smallest skulls exceeds that in the largest specimens among the 

 white males and in the negroes; in the white females the facts are the 

 reverse; while in the Indians the differences are immaterial. Much 

 larger numbers of cases would probably clear up the matter; as it is, it 

 is necessary to reserve conclusions. 



The differences in the absolute and relative length proportions of 

 the middle fossa3 between adults and young, in man and animals, in the 

 sexes, in races, and various forms of the skull, are contrasted in the 

 table that follows: 



Length projiortion.'y of middle fossae in relation to greatest external le-ngth of the skull. 



Subjects. 



Adults: 



White males— 



Dolichocephals 



Mesocephals 



Brach ycephals 



White ft/malfs — 



Dolichocephals 



Mesocephals 



Brachyeephals 



Indian males— 



Dolichocephals 



Brachyeephals 



Negroes— 



Males.dolicho- and mesocephals 



Females, dolicho- and mesoce 

 phals 



Fetuses and young 



White, brachyeephals 



CoIohmI, tirachycephals 



('()li>riii, dolicho- and mesocephals. 

 Anthro]ioid apes: 



Chimpanzees 



Orangs 



Gibbons 



Monkeys and lemurs: 



Miu'dciis jiilups 



Cchwi hijiiolcucus 



Alouata senicula 



Midas 



Lemur varius 



Average 



relation of 



the length 



of the 



fossEe to 

 the dorsal 

 length of 

 the skull. 



28.3 

 29.4 

 30.7 



28.6 

 29.5 

 29.8 



28.7 

 31.2 



28.1 



28.8 

 30.7 

 28.9 

 27.8 



32.3 

 31.1 

 32.0 



34.7 

 32.0 

 36.8 

 37.2 

 37.5 



Average 

 relation of 



length of 

 the skull. 



Contrary to what was witnessed with the frontal fossjie, the middle 

 cavities in the human young (particularly in the dolicho- and mesoce- 

 phalic colored fetuses) show somewhat smaller relative proportions 

 than in the adults. The increase in their relative value within the 

 series, from the smallest to the largest fetuses, is very irregular. 



In anthropoid apes the middle fossae are relativel}^ slightly longer, 

 in the monkeys and lemurs decidedly longer, than in any of the human 

 series. They differ most widely in this from the human j^oung. 



In sexes the relative proportions of the middle cavities differ quite 

 immateriall3^ Neither are there any great racial differences, though 



