PLATE LXIX. 



1, Littorina angulifera, twice natural size. 4, Cerithium floridanum. 



2, Littorina scutulata, much enlarged. 5, Cerithium muscarum. 



3, Littorina planaxis, enlarged. 6, Cerithidea scalariformis, enlarged. 



7, Cerithidea sacrata. 



