no 



LAND AND FRESH-WATER SHELLS OF N. A. [PART I, 



is distinctly shown in one of the figures ; it is entirely wanting 

 in E. leporina, and also in H. pustuloides. This groove is not 

 only an external character, but its presence modifies the internal 

 structure of the shell. On opening the base of the last whirl 

 immediately behind the aperture, a strongly developed transverse 

 tubercle is seen within, from which a strong ridge-like lamella 

 runs round the umbilical opening, corresponding in extent with 

 the groove. This tubercle, and the extension of it, are entirely 

 disconnected by a sinus or channel from the floor of the penult 

 whirl. 



The hirsute character of this species is not generally alluded 

 to by authors. The outer edge of the peristome in specimens 

 from St. Augustine, is of a deep rose color. 



Helix pustuloides. Bland. — Shell widely umbilicate, planorboid, 

 thin, rufous or pale horn-colored, delicately striated, with thin sparingly 

 hirsute epidermis ; spire scarcely elevated ; whirls four to four and a half, 

 slightly convex, gradually increasing, the last sub- 

 Fig. 186. angular at the periphery, at the aperture gibbous,' 

 constricted, suddenly deflected, beneath devious ; 

 suture rather deeply impressed ; umbilicus wide, 

 equal to one-third of the larger diameter of the shell, 

 showing all, but especially the penult whirl ; aper- 

 ture with an internal fulcrum-like process on the base 

 of the shell, oblique, crescentic, with an erect, oblique, 

 white, parietal lamelliform tooth, joined to the tapper 

 angle of the aperture by a slightly arcuate, filiform 

 Helix pxistuloides. callus ; peristome reflected, with margins approach- 

 ing, and having two dentiform lobes sepaiated by a 

 deep fissure. Greater diam. 5|, lesser 4^; height 21 mill. 



Helix pustula, Binney, Terr. Moll. II, 201, pi. xxxix, f. 3, not of Ferussac. 

 Helix pustuloides, Bland, Ann. N. Y. Lye. VI, 350, f. 3 (1858).— W. G. 



Binney, Terr. Moll. IV, 93. 

 Dcedalochila pustuloides, Tkyon, Am. Journ. Conch. Ill, 61, pi. x, f. 2, 3 



(1867). 



Georgia and Alabama. 



If. pustuloides is intermediate in size between H. pustula and 

 H. leporina — is less globose than the former, and more sparingly 



