202 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



YOL. XXXII. 



Indexes showing the interrelation of the cranial (cerebral) fosste. 



Subjects. 



Index a of an- 

 terior fossa. 



Num- 

 ber of 

 skulls. 



Index b of 

 middle 

 fossa. 



Index^of 

 the cere- 

 bral part of 

 the poste- 

 rior fossa. 



u c 

 2'u ■ 



and 



Adults; 



Whites, males — 



Dolichocephals. 



Mesocephals . .. 



Brachycephals . 

 Whites, females — 



Dolichoci'iilials 



Mes()ci']ihals . .. 



Briichyt-fpliuls . 

 Indians, males — 



Dolichocephals. 



Brachycephals . 

 Negroes — 



Males, dolieho- 

 mesocephals 



Females, dolicho and 



mesocephals 



Fetuses and young 



Anthropoid apes: 



Chimpanzees 



Gorilla 



Orangs 



(iibbons 



Monkeys, etc.: 



Ciiniicpphiiliin 



M, tennis IKlops 



Crbu.t lijijiolruciis 



Mycetes 



Alouata seniculn 



Midas 



Lemur varius 



Ursus americamis 



Deer 



Pig 



28.1 

 27.9 

 27.7 



28.0 

 •28.2 

 27.9 



26.1 

 26.44 



14 28. 2 



29.1 

 29.7 



31. r 

 27.7 

 29.4 

 33.2 



28.6 

 32.8 

 31.1 

 31.3 

 31.7 

 28.9 

 35.5 



27.4 

 27.1 

 26.8 



27.1 

 27.5 

 27. 5 



25.7 

 26.37 



27.2 



28.0 

 29.4 



30.2 

 27.1 

 28.9 

 33.2 



32.4 

 30.7 



•? 



3i.i 



29.2 

 35.8 



29.0 

 29.5 

 30.5 



29.5 

 29.4 

 29.3 



29.7 

 31.1 



28.4 

 27.7 



30.6 

 31.2 

 30.1 

 29.7 



32.4 

 31.7 

 31.8 

 35.4 

 35.9 

 33.3 

 36.3 



28.8 

 29.3 

 30.6 



28.6 

 29.0 

 29.3 



28.7 

 30.3 



28.3 

 27.5 



30.4 

 29.6 

 29.7 

 29.1 



31.3 

 32.0 



9 



34.5 

 34.8 

 36.6 



42.9 

 42.6 

 41.9 



42.5 

 42.4 

 42.8 



44.1 

 42.5 



42.4 

 42.5 



38.3 

 41.1 

 40.5 

 37.1 



39.0 

 3.5.6 

 37.1 

 33.3 

 32.4 

 37.8 

 28.2 



43.8 

 43.6 

 42.6 



44.1 

 4.3.5 

 43.2 



45.7 

 43.6 



43.7 



43.7 

 43.1 



39.4 

 43.3 

 41.4 

 37.7 



•? 

 36.3 

 37.3 



9 



34.5 

 36.0 

 27.6 



104 

 107 

 112 



105 

 105 

 106 



113 

 116 



105 



99 

 93 



99 

 111 



103 



89 



113 

 97 

 103 

 113 

 112 

 117 

 102 

 105 

 90 

 84 



150 

 146 

 138 



149 

 147 

 147 



154 

 140 



152 

 155 



127 

 138 

 137 

 127 



120 

 114 

 116 

 94 

 95 

 108 

 76 



152 

 151 



146 



153 

 151 

 151 



163 

 1.52 



151 



151 

 160 



126 

 146 

 139 

 119 



128 

 112 

 118 

 100 

 100 

 117 

 77 



[a=length of anterior fossa; «i=length of middle fossa; ps=length of postero-superior fossa.] 

 a ax 100 b TO X 100 c ps x 100 



a+m+ps a+m+ps a+rri+ps 



d Mean length of anterior foss8e=100. eMean length of middle foss8e=100. /Mean length of a 

 anterior and m, middle fossae C^ " )=100. 



The middle fossae are, it is seen, longer than the anterior ones in a 

 large majority of the series; they are shorter than the anterior cavi- 

 ties in the negro females, the fetuses and 3"oung, the chimpanzees, 

 gibbons, and the macaque. The longest middle fossas in relation to 

 the anterior ones exist in the Indians, gorilla, and several of the mon- 

 kej^s, while the shortest are found in the pig, the gibbons, and the 

 human fetuses and young. 



The length of the postero-superior cavities approximates one and a 

 half times that of the anterior fossae in all the series of human skulls; 

 it is somewhat less in the anthropoid apes, much less in most of the 

 monkeys, and least (only three-fourths of the length of the anterior 

 cavities) in the lemur. 



More simplified data are obtained by a comparison of the length of 

 the postero-superior fossae to the mean of the lengths of the anterior 



