362 Remarks on Certain Species of North American HelicidcB. 

 The following are measurements of varieties of H. major, — 



Diam.maj. 35, min. 30, Alt. 23, mill, (glohose), Florida. 



" Georgia. 



(depressed), " 

 (flattened), " 

 (elevated), " 

 (depressed), "Wisconsin. 

 " Missouri. 



The two latter I call intermediate forms — the following H. 



alholabris, — 



Diam. maj. 35, min. 30, Alt. 19, mill. K. Carolina. 

 " " 32, " 26, " 15, " Ohio. 

 " " 28, " 24, " 15, " Canada West. 

 " " 26, " 21, « 12, " Pennsylvania. 

 " " 23, " 19, " 11, " Tennessee. 



I possess two specimens of the above mentioned Wisconsin 

 shell. Both have a remarkably thick and dark-colored epider- 

 mis, the tooth-like process on the lip near the umbilicus very 

 prominently developed, and in one the spiral striae are nearly 

 obsolete. From its peculiar general aspect this seems even more 

 worthy of being treated as a distinct species than the typical 

 (globose) form of H. major. H. alholabris is frequently found 

 with a small parietal tooth, but such shells are distinct in form 

 from II. exoleta. I have specimens of H. multilineata with the 

 same process. 



Deshayes mentions Guadeloupe, on the authority of speci- 

 mens in the Museum, as habitat, though rarely, of II. alholabris. 

 I need scarcely say that in this there must be some error. 



