DR. J. THUETTAM ON SYNOSTOSIS OF THE CEANTviL BONES. 247 



the scaphoceplialic. The most marked examples of scapTiocephalus 

 seem to be those which are met with in Europeans, in ^\hom the 

 frontal lobes of the brain are largely developed, and produce per- 

 haps by their displacement, and by the needful compensatory 

 growth, that prominence of the frontal region which is so marked a 



'ff 



Fig. 1. ScaiylwccpliaVic Shull of a Woman.* 



feature in many of these cases. In the Negro, in whom the cere- 

 bral development, especially of the anterior lobes, is of a lower type, 

 the more marked features of true scaphocephalus are more rarely 

 seen, even when the synostosis may be presumed to have been con- 

 genital. The abnormal scaphoid skulls of the African races, as 

 compared with those of Europeans, may be termed sub-scaphoce- 

 phalic. They seem to fall very much under the definition of what 

 is termed by Welcker, synostotic dolichocephalism.'\ This less 



* For the sake of comparison with the Sub-scaphocephaUc and Klinocephalic 

 forms of Synostosis, more particularly treated of in this paper, I have, with the 

 approval of Dr. W. Turner, repeated from his memoir the figures of two decided 

 scaphocephalous crania. Fig. 1 is the profile of a skull, No. 27 of the 3Iuseum of 

 the College of Surgeons, Edinburgh ; Fig. 2 is the vertical view of a skull-cap, No. 

 117 of the University Museum ; which last is remarkable for the large "beak" of its 

 biparietal, and for the breadth of the frontal, which is greater than usual in sca- 

 phocephalus. 



f '' DoUchoccphali ex synosfosi sagittaU,'" {WachstMm vtid Ban,i>. 15, 53). 



