206 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



the deep umbilical rimation; aperture subtriangular; outer lip 

 slightly thickened, narrowly reflexed, descending in a nearly straight 

 hne to the convex periphery; basal lip sinuous, narrowly reflexed; 

 columella thick, concave at the edge of the umbilical rimation; 

 parietal callus broad, heavy, linguiform, and granulate; operculum 

 not found. 



Alt. 2.1, diam. 2.8, alt. of aperture 1.1, diam. 1.4 mm. 



The types are in the collection of the Academy, being tray num- 

 ber 44,370, and were picked from earth collected one mile northwest 

 of Sanchez, Santo Domingo, Hayti Island, by Dr. W. L. Abbott, 

 during February, 1919. 



This species differs from Helicina (Artecallosa) continua (Gundl.) 

 Poey by having broader parietal callus, smaller umbilical rimation, 

 a more sinuous basal lip, a broader columella, a more obtuse spire, 

 and is smaller and more globose. 



Stoastoma domingensis n. sp. PI. VI, figs. 4, 5. 



Shell small, conic, thin, opaque, greyish white; apex rather obtuse, 

 smooth; spire high, conic, slightly concave sided, composed of five 

 and one half convex whorls; body whorl contracted and free near 

 the aperture; suture impressed, descending in front; periphery 

 evenly convex; base convex; umbilicus minute. The surface of the 

 shell is sculptured fine spiral hair lines, of which nine are visible 

 on the penultimate whorl, about nineteen on the bodj^ whorl, and 

 sixteen on the base, the growth lines are very indistinct; last whorl 

 provided with a smooth band near the aperture; aperture semi- 

 lunate; peristome continuous; outer lip evenly arcuate; basal lip 

 acute; columella arcuate, slightly thickened; parietal wall nearly 

 straight, rather thick, free from the penultimate whorl. 



Alt. 2.47, diam. 2.26, alt. of aperture .89, diam. 1.04 mm. 



The type is in the collection of the Academy, being tray number 

 44,372, picked from soil collected by Dr. W. L. Abbott, one mile 

 northwest of Sanchez, Santo Domingo, Hayti Island. 



This species is larger and more conic than Stoastoma (Lindsleya) 

 leanum Ad., which it resembles in the shape of the aperture and 

 sculpture. 



