69 



The crania of Orariau tribes of Northwest America and Eastern Siberia, 

 when compared with those of Greenland, show a greater cubical capacity ; 

 a head of about the same length, but proportionately much broader in its 

 broadest part and with a broader forehead. The skull is also proportion- 

 ately not so high. The coronal ridge, [typical to a certain extent of all 

 Orarian crania, and from whicli it occurs that the terms "roof-shaped" and 

 " scapho-cephalous " have been applied to them,] whicli is very strongly 

 marked in some Greenland skulls, is less apparent in the majority of the 

 Northwestern Orarians, and the decrease in cranial capacity occurring from 

 a diminution in this particular is made up for by a broadening of the 

 cranium. 



The following table shows the facts alluded to. The number of crania 

 from the Northwest affording the means used range from 36 to 42, being 

 taken from the preceding tables, and compared with a series of means from 

 99 to 101 Greenland skulls measured by Dr. Bessels. 



Among the northwestern people, the crania of the Aleuts collectively, 

 compared with the Northwest American and East Siberian Innuit crania, 

 show differences precisely similar to, but less in degree than, those which 

 have been pointed out as distinguishing the northwestern people from the 

 Greenlanders ; the Aleuts, as might be expected, showing the greater special- 

 ization, while the continental people tend more toward the Greenland type. 



In obtaining these means, an average of twenty-five Aleut crania have 

 been em^iloyed, and an average of fifteen of Asiatic and Northwestern 

 American Innuit. 



The people of the Aleutian Islands were formerly divided into two 

 principal groups or tribes according to some authorities on the subject, 



