NO. 1521. MEASUREMENTS OF CRANIAL FOSSAE— HRDLICKA. 



193 



it should be noted that the Indian male brachycephals show the max- 

 imum and the negro dolioliocephals the minimum proportions. 



There are, however, even more so than with the frontal cavities 

 (q. v.), differences of the relative length of the middle fossw in the 

 different forms of the skull, this length being- throughout smaller in 

 the dolichocephals than in the brachycephals, while with the mesoce- 

 phals it is mostly intermediary. Even in the young the proportions 

 are higher in the short than in the long crania. The differences 

 ]-egarding the frontal fossa? were, it will be remembered, of a like 

 nature, though seemingly of different morphological significance. 



The correlation of the middle with the other fossie will be dealt with 

 in a future section. 



POSTERIOR FOSS.(E: CEREBRAL PORTION. 



The absolute lengths of these fossa? are as indicated in the figures that 

 follow. In the three upper lines of the tal)le are represented only those 

 skulls in which also all the other fossa? could l)e measured, that is, 

 skulls which correspond to those given in tables of absolute measure- 

 ments of the middle and frontal cavities; while in the fourth line are the 

 lengths of all the pairs of the postero-superior fossie in the skulls 

 examined. The two lines of figures show no great difference. 



Posterior fossK, cerebral part: Average length in, adults. 



o Difference from the right fossa. 



The most striking feature of the above data is the evidence tbat in 

 all the groups and series the left fossa is the longer, which is the 

 reverse of what was observed with the middle and especially with the 

 Proc. N. M. vol. xxxii— 07 13 



