EXPLANATION TO PLATE 36. 



CLINCH CIVER. 



Groups. Lots 170, 166, 16S, 51, 1(54, 167, 165, and 161). Tliis scries is composed of several 



small lots, extendin<ij from Dun<j;annoii to Crafts Ferry, \'a. This is the transitional series in 



the Clinch from the smooth to the spinose shells, and is the form paulensis. About natural size. 

 134 



Si 



