314 MEXICAN LEPTINARIA. 



specimens showing the color are known, but it is probably 

 yellowish-corneous or white in life. 



29. L. SIMPSONI (Ancey). PI. 42, fig. 23. 



Shell imperforate, thin, somewhat pellucid, nearly color- 

 less, glossy, subarcuately striatulate; spire regularly conic, 

 elongate, quite obtuse at the apex. Whorls 6%, regularly 

 and rather slowly increasing, a little convex, parted by a 

 well-impressed suture, the penultimate a little flattened in the 

 middle, last whorl ample, inflated and convex past the middle, 

 regularly descending. Columella thin, long, strongly twisted 

 and truncate near the base, forming a wide, obtuse tubercle ; 

 narrowly reflexed and thickened over the umbilical region. 

 Aperture nearly pirif orm, subeff use at base ; peristome simple, 

 acute, not in the least thickened or reflexed, the outer margin 

 produced forward, sinuated at the upper insertion, basal 

 margin receding, well rounded within. Length 9, diam. 4.25, 

 aperture 3.5 x 2 mm. (Anc.) . 



Honduras: Utila Island (C. T. Simpson). 



Nothus simpsoni ANC., Ann-ales de Malacologie, ii, p. 245 

 (1886). 



"Remarkable for the long cone of the spire, obtuse at the 

 summit, the absence of a perforation, and the spreading base 

 of the aperture" (Anc.). 'Specimens of the original lot re- 

 ceived from Mr. Simpson are not full-grown, the one figured 

 measuring, length 7, diam. 2.8, aperture 2.7 mm., with 5% 

 whorls. The surface is very finely and sharply arcuately 

 striate, without any trace of spaced riblets. The base is 

 somewhat smoother. 



30. L. FORDIANA (Ancey). PI. 42, fig. 24. 



Shell subturrite-oval, of the same color and luster as simp- 

 soni, imperforate, under the lens arcuately obsoletely striat- 

 ulate except at the apex and base. Spire scarcely longer than 

 the aperture, regularly conoid and tapering, obtuse at the 

 summit. Whorls 5%, regularly increasing, convex, parted 

 by an impressed suture, the first two smooth, the last whorl 

 large, nearly as long as the spire, somewhat inflated, very 

 convex, smoother below the middle. Aperture irregularly 



