12 



LAND AND FRESII-AVATER SHELLS OF N. A. [PART II. 



Fig. 13. 



lines are commonly found on young specimens. DeKay mentions 

 this as var. a, Pfeiffer as jS. The latter author also de- 

 scribes a var. y : — 



Last whirl sub-excavated below the suture, minutely spirally 

 striated ; lip with a white ridge of callus within the dark- 

 colored margin, with from G-10 regular folds. 



Georgia. {Pfeiffer.) 



He quotes in the synonymy of this variety 3Iel. 

 borealis, Conrad, of Cuming's collection. Conrad's 

 species is much more likely to be Alexia myosoiis than any variety 

 of Mel. hidentatus. 



Potiez & Michaud describe and figure quite a distinct shell 

 under the name of Auricula bidens, Say. 



Stimpson gives precedence to Deshayes's name corneus. Say's 

 name has eight years' priority, and is not pre-occupied in the 

 genus llelavijnis. It was while treated as an Auricula that any 

 question existed in regard to its specific name. 



PI. 75, Fig. 2.3, of the Terrestrial Mollusks, lY., represents a 

 specimen not furnished with lamince within the peristome. 



The date of publication of this species is erroneously quoted 

 by Pfeiflfer as 1821. The title-page of the first part of Vol. II 

 of the Academy Proceedings bears this date. The description 

 was actually published at the date given by me. 



Melamptis fiaous, 

 twice natural size. 



Melampus flavus, Gmel. — Shell imperforate, 

 obconic, smooth, chestnut-colored, with three light, nar- 

 row bands ; spire short, convex conic ; suture slightly 

 impressed ; whirls from nine to ten, the upper ones 

 flattened, the last about equalling three-fourths of the 

 length of the shell, arcuately ridged below ; aperture 

 sub vertical, narrow, angulated below; one deep parietal 

 fohl, one subvertical, stout, columellar fold, extended 

 towards the base ; peristome straight, acute, its outer 

 margin reddish, thickened with white within and fur- 



