312 MEXICAN LEPTINARIA. 



ascending outwardly, columellar margin a little oblique, 

 lightly dilated and reflexed above, obsoletely toothed in the 

 middle. Length 4, diam. 2, aperture 1.5x3 mm. (Marts.). 



Nicaragua : Acoyapa, on the north side of Lake Nicaragua 

 "(Belt). 



L. sinistra MARTS., Biologia, p. 319, pi. 18, f. 11. 



Distinct from all others of the genus by the sinistral 

 whorls. Only one specimen was found. The quadrangular 

 form of the aperture and the very feeble development of the 

 columellar tooth are perhaps due to the shell not being full- 

 grown (Marts.). 



26. L. GUATEMALENSIS (Crosse et Fischer). PI. 41, fig. 11. 



Shell subperforate, ovate-turrite, rather thin, subdiaph- 

 anous, longitudinally plicate-costulate, whitish, somewhat ele- 

 "vated, the apex obtuse, suture impressed. Whorls 6, convex, 

 the last about two-fifths the total length, rounded and a little 

 Smoother at base, the plicae passing into striae. Aperture 

 slightly oblique, sinuate-oblong; peristome simple, thin, un- 

 expanded, the columellar margin rather wide, lightly dentate- 

 twisted, white, outer lip curving forward a little, acute. 

 Length 5.5, diam. 2.5, aperture 2x1.25 mm. (C. et P.). 



Guatemala: Coban (Sarg, type loc.) ; Retalhuleu, in a 

 wood under decayed leaves (Stoll). 



Spiraxis guatemalensis C. & F., Journ. de Conch., xxv, 

 1877, p. 271 ; Miss. Sci. Mex., Moll., i, p. 618, pi. 25, f . 10.- 

 Xeptinaria g., MARTENS, Biologia, p. 319, with var. majus- 

 cula, pi. 18, f. 13. 



"This form is very closely related to 8. mexicanus Pfr., 

 but it is distinguished by its slightly smaller size, the stronger, 

 more crowded and more arcuate longitudinal riblets, which 

 extend wholly across the whorls of the spire, and on the last 

 whorl change gradually into stria? instead of disappearing 

 abruptly in the middle" (C. et F.). It is somewhat smaller 

 than L. interstriata Tate, with a weaker columellar lamella. 



Var. majuscula Martens. PI. 41, fig. 15. 



Larger, and with a stronger columellar fold. Length 7 to 

 7.5, diam. 3 to 3.5, aperture 2.66 to 3.5x2 mm. (Marts.). 



