ANTILLEAN LEPTINARIA. 299 



forward ; colurnella vertical, calloused, obliquely truncate at 

 the base. Parietal film very thin. Length 4.9, diam. 1.3 mm. 



Jamaica, probably in the western end, in company with 

 Spiraxis terebella conferta. 



This diminutive form was first noticed in the Adams col- 

 lection at Amherst, where there are two specimens (figs. 19, 

 20) with the type of Spiraxis terebella. "The larger of these 

 is 4.3 mm. long with fully 6 whorls. Two larger shells were 

 subsequently found in the collection of the Academy, one of 

 which is made the type of the species (fig. 21). It is remark- 

 able for the smoothness of the surface, the narrow contour 

 and weak truncation of the columella. It has somewhat the 

 aspect of Obeliscus swiftianus. Named in honor of Mr. S. 

 Raymond Roberts. 



L. ACICULARIS (Shuttle worth). 



Shell acuminate-subulate, thin, smooth, glossy, waxen. 

 Whorls 8, slightly convex, the last scarcely one-fifth the total 

 length, base abruptly rounded; suture profound, whitish- 

 crenulate. Aperture ,ovate-oblong, the base well rounded, 

 truncate above. Columella subarcuate, intorted, obliquely 

 calloused and truncate within at the base. Length 9, diam. 

 2.25, aperture 1.5x1 mm. (Shuttl.). 



Porto Rico : Fajardo ; a single specimen taken by Blauner. 



Stenogyra (Subulina) acicularis SHUTTL., Diagnosen n. 

 Moll., no. 6, p. 141, in Mittheil naturforsch. Ges. Bern, 1854, 

 p. 49. Achatina a., PFR., Monogr., iv, 614. 



This form remains unknown to later collectors. It prob- 

 ably stands close to Leptinaria abdita, gracilis, etc. I have 

 not seen specimens. 



6. L. GRACILIS n. sp. PI. 44, fig. 66. 



Shell imperforate, very slender, whitish-corneous, sub- 

 opaque; surface rather glossy, finely striatulate, almost 

 smooth. The spire tapers straightly to the small summit. 

 Whorls 9!/2, strongly convex, the convexity greatest below the 

 deeply impressed sutures. Aperture subvertical, the outer 

 lip arched slightly forward. Columella concave above, cal- 

 lous and obliquely truncate below. Length 9, diam. 2.2, 

 length of aperture 2.2 mm. 



