MEXICAN LEPTINARIA, 305 



slight obliquity of the 'columella near the base has served to 

 give it place in the latter genus, whether fairly or not I aan 

 in doubt. 



15. L. VENEZUELENSIS (Pfeiffer). 



Shell subperforate, turrite-oblong, thin, striatulate, diaph- 

 anous, waxy- whitish. Spire elongate, the apex rather obtuse. 

 Whorls 7, convex, the last one-third the total length, rounded 

 basally. Coilumella slightly twisted, subtruncate. Aperture 

 slightly oblique, oval-oblong; peristome simple, unexpanded, 

 the columellar margin dilated above, reflexed, subpatulous. 

 Length 11, diam. 4, aperture 4x2.25 mm. (Pfr.). 



Venezuela: Caracas (E. Klocke). 



Spiraxis venezuelensis PFR., Malak. Blatter, iii, 1856, p. 

 47; Monogr., iv, 574. 



This species has not been figured. 



16. L. PACHYSPIRA n. sp. PL 46, figs. 8, 11. 



Shell perforate, oblong-conic, thin, greenish-yellow, sur- 

 face glossy, finely sculptured with very fine, close, nearly 

 regular vertical striae, wanting on the smooth 1^ apical 

 whorls and weaker on the base. Spire straightly tapering 

 to the very large, obtuse summit. Whorls 6, moderately 

 convex, narrow, parted by a well-impressed suture, the la#t 

 whorl swollen. Aperture vertical; outer lip slightly arched 

 forward, thin; columellar lip broadly reflexed above. Colu- 

 mella vertical, with a rather acute, obliquely-entering lamella 

 near the base. Parietal wall covered with a very thin, trans- 

 parent film. 



Length 9.3, diam. 4.6, aperture 4 mm. 



Length 9.4, diam. 4, aperture 3.9 mm. 



San Estevan, Porto Cabello, Venezuela (C. F. Starke, 1863, 

 in Swift coll.). 



This species is unlike other known forms in its very 

 large, obtuse summit and the acute lamella encircling the 

 columella near its base. 



Species of Mexico and Central America. 

 The numerous species are for the most part not very d^ 

 tinctly differentiated, and their number will probably be re- 



