i9 



AVe liave an (^dentate variety wliicli I liad supposed 

 to be //. major, Binney. But, m}^ friend, Dr. Lewis, 

 suggests that they are only immature exoleia, and on 

 further examination, I agree with him. Tlie tooth of 

 //. exoleta is only developed on the mature shell. 



IIF.I.1X Tiivitoinus, S\y. 



The shell has live whirls with oblique stria?, spire 

 depressed, aperture lunate, lip wiiite, reflected, and at 

 the basal portion partially covering the umbilicus, tooth 

 process on the parietal wall, shell liorn colored, breadth 

 nearly one inch. Yer}^ abundant. 



IIB:f.IX CI.A.i;SA, Say. 



Shell has live whirls, is somewhat elevattnl, horn 

 color, lip reflected, and at the basal portion partially 

 covering the umbilicus, greatest dia. 18 mill. Very 

 abundant. 



IIEI.IX l»ROFi;.-\I>A, Say. 



Shell depressed, umbilicati^d, lip white, reflected, 

 thickened, with a blunt callus on the inner side near 

 the base, whirls six, shell horn color with two broad, 

 revolving bands and two smaller ones, all of a reddish 

 color, extending into the aperture. Shell has coarse 

 and oblique stria), umbilicus large and deep ; greatest 

 breadth one and one-fourth inches. 



This is another of our banded species. Some speci- 

 mens have but one band. We have a variety with a 

 sort of protuberance on the outer circumference of the 

 last whirl, one-fourth inch from the margin of the lip. 

 The species are very prolific in this county. 



