146 NATURAL HISTORY OF 



not till after six or seven years. In one child of the 

 last mentioned age, having a very flat occiput, the line 

 of separation was marked by a most perfect suture 

 from the squamous part, and was four inches in breadth 

 by two in height." In remembrance of the nation 

 where this conformation is alone found, the learned 

 doctor denominated this bone Os. Incce ; and he further 

 remarks, that it corresponds to the Os. interparietalis 

 of Rodentia and Marsupiata.* 



These characters had been previously noticed by 

 Mr. Franklin Bellamy, in a paper read by him to the 

 Naturalist's Society of Devon and Cornwall, together 

 with remarks which do not occur in Dr. Tschudi's 

 communication, and are, nevertheless, of considerable 

 importance. Comparing the cranium of two Titicaca 

 children, with skulls of Europeans of similar age, he 

 found the frontal bone, the parietal and occipital bones, 

 of the former, all considerably larger than the latter, 

 elongating the head posteriorly, and throwing back the 

 whole skull. This peculiarity was greatest in the cra- 

 nium of an infant, not many days old, and lessening 

 with growth in the older head; therefore it was not 

 absolutely the result of bandages ; because the natural 

 effect of these would tend more to increase than to 

 decrease this result. From the email flattened fore- 



* Recent investigations, conducted by Sir Robert Schom- 

 burgk, show the Maopityan, or Frog Indian tribe, at the 

 sources of the Corentyn, to be naturally flatheaded. D'Or- 

 bigny's Aymaras cannot be of the same stem ; and the gene- 

 ralizing conclusions of Dr. Morton, to say the least, are 

 premature. 



