188 Binney on Terrestrial MoUnsks. 



in Florida, and having been referred to Pfeiffer for identi- 

 fication, was returned with tlie name of subcylbidrica. 



Its accidental introduction into England accounts for 

 its presence in the English works above referred to. 



The base is not furnished with the prominent ridge or 

 carina. 



TRUNCATELLA BILABIATA Pfeiffer. 

 Plate LXXV. Figukes 3, 7. 



T. subrimata, cylindracea, gracilis, solida, opaca, fusca, costulata ; costis 

 subai'cuatis, elevatis, obtusis, interstitia :u(jiiantibiis ; sutura profunda, 

 simplex ; anlV. superst. 4^-5 coiivexi, ullimus vix loiigior, basi subfom- 

 pressus, callosus ; apertura verticalis, ovalis, superne vix angulata ; perist. 

 duplex ; externum album, callosum, patens, in cristam basalem transiens, 

 internum continuum, breviter porrectum. (Pfr.) 



SYNOXYMS AXD KEFERENCES. 



Truncalella bilabiala Pfeiffer in Wiegm. Arch. 1840, i. 253; in Zeit. f. Mill. 1846, 

 p. 187; Jlon. Auric. Viv. 192; Jlon. Pneum. Viv. ii. 8. 

 Chemnitz, ed. 2, p. 7, pi. 1, figs. 27-31. 



DESCRIPTION. 



Animal not observed. 



Sliill subperforated or grooved, cylindrical, elegant, solid, 

 opaque, brownish ; ribs subarcuate, elevated, obtuse, at 

 equal distances ; suture deep and simple ; remaining 

 whorls 4^ to 5, convex, the last scarcely longer than the 

 others, heavy and subcompressed at base ; aperture verti- 

 cal, oval, scarcely angular above ; peristome double, the 

 outer one white, heavy, and terminating in the basal ridge 

 or carina, the inner one continuous. 



Length 5?,, breadth 1^, length of aperture \\ millimetres. 



Geographical Distribution. Found with the preceding 

 species; also in Cuba (Pfeiffer), and on Carmen, an island 

 of tlie Gulf of Mexico (Kiister). 



Rrmarks. The duplicated peristome ajid highly devel- 



