52 [July, 1841. 



much more so than the surrounding barbarous tribes ; and appear, 

 in fact, to have been the connecting link between the two. The 

 largest of these heads gives 85 cubic inches of internal capacity ; 

 the smallest 77 ; the medium being 80 cubic inches. The configu- 

 ration of these heads is on the same model as the preceding series, 

 and the mean facial angle differs but a single degree. 



Whoever will be at the pains to compare this series of skulls 

 with those from the barbarous tribes, will, I think, agree that the 

 facts thus derived from organic characters, corroborate the position 

 I have long maintained, that all the American nations, excepting 

 the polar tribes, are of one race and one species, but of two great 

 families, which resemble each other in physical but differ in intel- 

 lectual character." 



STATED MEETING, July, 13, 1841. 

 Vice President Morton in the Chair. 



DONATIONS TO MUSEUM. 



The following species of shells were presented by Mrs. L. 

 W. Say, through Mr. Phillips, viz: 



Melania nupera, M. subglobosa, M. isogona, M. exilis, 

 M. undulata, M. annigera, M. conica, M. acuta. An- 

 culotus concolor, A. costatus, A. Kirklandianus, A. cari- 

 natus, Physa Sayii. Very fine specimens, chiefly from the 

 Wabash. 



Chiton . new species ? from Chapman's Island, Pacific 



Ocean. From Dr. Ruschenberger. 



