540 PROCEEDINGS OF THE ACADEMY OF [Nov., 



NEW LAND SHELLS FROM MEXICO. 

 BY HENRY A. PILSBRY. 



Most of the species here described were collected by Mr. A. A. 



Hinkley early in 1909. The localities mentioned may be found marked 



on the map on p. 520. 



Schasicheila xanthia n. sp. Fig. 1. 



The shell is conic, thin, of a uniform maize yellow or pale lemon 



color, rather weakly marked with fine growth-striae ; whorls 4^, very 



convex, parted by a deep suture, the last whorl well rounded throughout, 



slightly descending at the aperture. Aperture 

 slightly oblique; outer lip very slightly ex- 

 panded. Inner lip straight, continuous. Colu- 

 mellar area small, white, the umbilical region 

 deeply impressed. The operculum is thin, 

 white, a little sunken at the nucleus, the lower 

 angle projecting in a short point beyond the 

 basal lip. 



Alt. 4.9, diam. 4.9 mm. 



Canyon below Las Canoas, State of San Luis Potosi, in crevices and 

 on ledges of the bluffs, under stones and debris. Types 99,024 A. N. 

 S. P. 



This snail is related to S. minuscula Pfr., but on comparison of 

 specimens it is seen that in the new form the spire is higher, more 

 acute, and the suture is deeper. The operculum is in place in the 

 figured type. 



Helicina vanattse n. sp. 



The shell is turbinate-globose, similar to H. chrysocheila Binn., 

 white, the upper whorls often flesh colored, the last whorl often having 

 a wide dull purplish or dull red band above the periphery, and partly 

 exposed above the suture on the spire; marked with a bright scarlet 

 streak behind the lip, with usually, in large shells, a more conspicuous 

 streak at the last third of the last whorl, and another on the penulti- 

 mate whorl. The spire is conic, apex rather acute. Whorls 6, slightly 

 convex, the last rounded peripherally. Sculpture of faint growth- 

 lines, very fine, close spiral striae (sometimes subobsolete), and very 

 weakly developed, short, forwardly-descending wrinkles. Aperture 



