MEXICAN LEPTINARIA. 317 



Allied to L. mexicana, but of larger size, with compara- 

 tively greater diameter of the last whorl and fainter striae 

 (Marts.). 



34. L. IMPEEFORATA ( Strebel) . PL 42, fig. 28. 



Shell strong, translucent, whitish, rather narrowly turrite 

 and moderately glossy. The sculpture consists of irregular 

 but close, fine fold-striae, between which, in the irregular, 

 rather wide intervals there are fine ripple-folds, not very well 

 expressed and only weakly arcuate. The whorls show, as 

 usual, their greatest convexity near the suture, causing the 

 latter to be deep. The right lip is simple, unexpanded, 

 scarcely arched forward in the middle. The columellar re- 

 flection is narrow, and so closely appressed that no umbilical 

 fissure is visible. The axial lamella is quite like that of L. 

 aquatorius, only less strongly developed. No parietal callus 

 is visible (Strebel). 



Length 12.9, diam. 4.2, aperture 3.9 x 2.3 mm. ; whorls 

 fully 8. 



Length 11.5, diam. 4.2, aperture 3.7 x 1.9 mm. ; whorls 



Length 11.2, diam. 3.7, aperture 3.7 x 1.8 mm. ; whorls 



Mexico: Jalapa, on a strawberry plant (Estefania Salas). 



Lamellaxis imperforatus STREBEL, Beitrag Mex. Land- und 

 Siisswasser-Conchylien, v, p. 113, pi. 7, f. 14c; pi. 17, f. 2 

 (1882). 



This species differs- from L. cequatorius by its more slender 

 shape, greater number of whorls in specimens of the same 

 size, the closed umbilicus and the somewhat different sculp- 

 ture (Strebel). It is apparently allied to the L. anomala 

 group of South America and the L. striosa group of the An- 

 tilles, rather than to other Mexican species. 



35. L. HAPALOIDES Martens. PI. 41, fig. 20. 



Shell turrite, perforate, rather solid, subarcuately lightly 

 plicatulate, a little glossy, white. Whorls 8, rather convex, 

 the suture gradate, last whorl well rounded basally. Aper- 

 ture slightly oblique, trapezoidal-piriform, outer margin ar- 

 cuate above and below, straightened in the middle, distinctly 

 arched forward; basal margin rather narrowly rounded. 



