TWO NEW LAND SHP:LLS FROM MEXICO. 



By Paul Bartsch. 



Assistuid Cunttur, Division of Mollusk-K, I'. S. National Museum. 



Among- a consio-nment of Mexican mollusks transmitted to the 

 United States National ^Museum by Prof. A. L. Herrera for determina- 

 tion, there are two forms of Dryrna'm^ which have not been previously 

 noted. These ai-e here descril)ed and figui-ed. 



DRYMiEUS HERRERiE, new species. 



Shell ovate, conic, thin, translucent, maize-yellow w4th a little 

 darker colored apex. Nepionic turns two, moderately rounded, hav- 

 ing the typical grated sculpture. Succeeding whorls moderately 

 rounded, marked on the spire and base by strong", 

 longitudinal wrinkles, which are little wider than 

 the spaces that separate tiiem. The entire surface 

 is also crossed b}' numerous very fine, closely, and 

 subequally spaced spiral striations, which are a 

 little more strongly developed about the umbilical 

 area of the base than near the summit of the turns. 

 Sutures strongly impressed, rendered subserrulate 

 b}' the wrinkles on the summit of the whorls. Base 

 narrowly perforate, the um])ilicus l)eing partly con- 

 cealed by the white, straight columella, which is 

 broadly expanded and reflected at the base. Aper- 

 ture decidedly oblique, oval, outer lip thin, semi- 

 transparent. 



Four specimens of this species were collected by Prof. H. L. Herrera 

 at Bonanza Zimapan, Hidalgo, Mexico. The type and one additional 

 specimen form Cat. No. 19299!^, U.S.N.M. The type has six and one- 

 eighth whorls and measures: Altitude, 20 mm.; greater diameter, 10 

 mm.; lesser diameter, 9 mm.; length of apertur(>. 10.3 mm. Another 

 specimen has six andone-hfth whorls and measures: Altitude, 21.3 mm. 



An immature individual shows a faint angulation at the peripher3\ 



Fig. 1.— DRYxMiEUS 



TIERRER.E. 



Proceedings U. S. National Museum, Vol. XXXII— No. 1515. 



119 



