130 TRUNCATELLID.E. 



7. TRUNCATELLA SUBCYLINDRICA. B.M. 



Shell scarcely rimate, cylindrical, shining, pellucid, horn- 

 yellow or glassy, sculptured with crowded and regular minute 

 ribs, which are sometimes only conspicuous near the suture, 

 sometimes quite obsolete ; remaining whorls four, moderately 

 convex, flattened in the middle, increasing regularly, the last 

 not keeled in front; aperture perpendicular, large, angularly 

 ovate, slightly effused at base ; peristome somewhat thickened, 

 with the outer margin rather produced ; columellar margin 

 narrowly reflected, adnate and thickened above. Length 5, 

 breadth 2 mill. 



Helix subcylindrica, Pidteney, Cat. Dorsetsh. p. 49. 



Mont. 'Test. Brit. ii. p. 393. 

 Trimcatella truncatula, Lowe in Zool. Joum. v. p. 299. pi. 13. 



f. 13-18?; in Proc. Z. 8. 1854, p. 217. 

 Truncatella subcylindrica, Gray in Turt. Man. ed. nov. p. 22. f. 6. 



Shuttlew. Diagn. n. Moll. no. 7. p. 154. 



Pfr. Mon. Auric, p. 186. 

 Truncatella Caribasensis (part.), Pfr. in Zeitschr. f. Mai. 1846, 

 p. 182. 



Kust. Mon. t. 2. f. 1-4. 



Sab. Cuba, Portorico, St. Thomas, Bermuda, &c. ; Madeira ? 



8. Truncatella Bairdiana. 



Shell sublimate, cylindrical, rather thin, pellucid, horny 

 amber-colomed, sculptured with rather crowded, obtuse, longi- 

 tudinal ribs ; suture deep, strongly crenate ; remaining whorls 

 four, moderately convex, the last nearly smooth, crenated and 

 imperceptibly compressed in front ; aperture nearly perpendi- 

 cular, angularly ovate ; peristome double, the outer one keel- 

 shaped, spreading, the inner continuous, with the columellar 

 margin very slightly arched. Length 5, breadth If mill. 



Truncatella Bairdiana, C. B. Adams in Ann. Lye. New York, v. 

 p. 437, 543. 



Pfr. Mon. Auric, p. 187. 



|3. Rather smooth, the whorls only crenated strongly near the 

 suture and at the base. 



Hah. Panama. 



9. Truncatella teres. B.M. 



Shell scarcely subrimate, cylindrical, rather thin, pellucid, 

 shining, rufous horn-coloured, more or less distinctly sculp- 

 tured with small longitudinal ribs ; suture marginate, strongly 

 folded and crenate ; remaining whorls four, rather equal, mode- 



