300 AMERICAN JOURNAL 



ACICULA, Leach. 

 1. Acicula acicula, MUller. 



Plate 14, figure 13, 



Cylindrical, acicular, spire attenuated, apex obtuse, suture 

 narrowly margined ; whorls 6 or 7, flat ; aperture narrow, lip 

 acute, columella arcuate. Hyaline, polished. 



Length 4, diam. 1 mill. 



European ; introduced with imported plants, and sparingly 

 distributed in a few places in the vicinity of greenhouses. 

 Becoming naturalized. 



This is an European species, introduced originally with im- 

 ported plants ; it has been found frequently in greenhouses, and 

 lately, by Mr. A. D. Brown, of Princeton, N. J., in his garden. 



STENOGYRA. 



Subgenera. 



RUMINA, Risso. Cylindrically elongate, truncate at apex, 

 whorls remaining 4 or 5, smooth, shining ; aperture semi- 

 oval, lip margined within, not expanded, its extremities 

 joined by a callus, columella not truncate ; rimate. 



Opeas, Albers. Elongated, thin, striate, shining ; wdiorls 6 — 8, 

 the last compressed, perforate ; aperture ovate oblong, 

 equalling one-third to one-fourth of the total length, lip 

 simple, acute, columellar margin reflexed. 



Melaniella, Pfeiffer. Elongated, imperforate, costate ; aper- 

 ture ovate, effused at base, peristome simple, subcoutinu- 

 ous. 



i. Rumina decoUata, Linnaeus. 



Plate 14, figure 15. 



Shell cylindrically turrited, rather thick, smooth, semitranspa- 

 rent ; apex truncated, leaving 4 or 5 nearly flat whorls ; aper- 

 ture oval, angular above; outer lip thickened but not reflected, 

 columellar lip reflected ; umbilicus imperforate. Bright amber 

 color. 



Length (truncated) 25, diam. 10 mill. 

 Charleston, S. C. 



