North American Helicidce. 349 



The following is a copy of Dr. Gould's description : 



"H. LEPORINA. 



"T. parva, lenticulari, lucida, rnfo-cornea, pilosiuscula, leviter striata, 

 vix perforata; spira depressa, anfr. 5, convexiusculis, ultimo superne 

 subangulato ; regione umbilicali excavato ; apertura, lunata, labro incura- 

 bente, reflexo, roseo, dentes duos albos sinum amplectentes gerente ; 

 lamella columellari obliqua, alba, erecta, acuta, rectangulari, callo lineari 

 superne ad augulum apertura? juncta. Diam. \, alt. ^ poll. Hab. Mis- 

 sissippi and Arkansas. 



"Intermediate between H. hirsuta and H. inflecta, tbougb smaller than 

 either. It is less globose than hirsuta, while the aperture is much the 

 same, except that the sinus of the lip is formed by the projection of two 

 teeth instead of by an emargination, in this respect resembling H. inflecta. 

 From the latter it differs in the columellar tooth. It resembles H. pus- 

 tula still more, but the umbilical region wants the peculiar channel of 

 that species." 



Pfeiffer states, in his before-mentioned letter to Mr. W. G- 

 Binney, that he now thinks this species distinct from H.pustula 

 Fer. 



Reeve remarks, — " It has been much doubted whether this 

 and H. pustula are not varieties of the same, still the smaller 

 shell has the larger umbilicus." He gives as habitat, Ten- 

 nessee. 



H. leporina is larger than H. pustula, less elevated, the 

 whorls are less convex, the incremental striae less numerous and 

 distinct, and the aperture is wider. The umbilicus is more 

 nearly covered by the lip, and is without the groove which 

 prevails in Ferussac's species. 



"Within and near the aperture, there is what may be called 

 the "fulcrum" extending from the floor of the last to that of 

 the penultimate whorl, and approaching in character to, but less 

 strongly developed, than that in H. monodon Rack. The outer 

 edge of this fulcrum is uneven, — in one of my specimens some- 

 what denticulated. 



