610 The American Naturalist. [July, 
hatchee, it is possible to tie up within three hundred yards of 
theshell heap. Its maximum height is about six feet near 
Sherd, Tick Island. (Actual size.) 
——— Ó— ER 
Sherd, Tick Island. (14 size.) 
the center, from which point it slopes in every direction toward 
the surrounding prairie. 
Excavation I. 
At the apex of the mound a hole, slightly converging, 6 
ft. by 4 ft. by 7 ft. deep, was dug. Beginning ata level one foot 
