TRUNCATELLA. 187 



modo conspicuis, vel evanescentibus munita, nitlda, pellucida, corneo- 

 flava vel hyalina ; anfr. superst. 4 convexiusculi, medio planati, regulariter 

 accrescentes, ultimus basi non cristatus ; apertura A'erticalis,anipla, angu- 

 lato-ovalis, basi subeffiisa ; perist. leviter incrassatum, margiiie externo 

 subproducto, columellari breviter reflexo, adnato et superne incrassato. 

 (Pfr.) 



SYNONYMS AND REFERENCES. 



Eelix subcylindrica Pulteney, Cat. Dorsetsh. p. 49. 



]\IoNTAGU, Test. Br. ii. p. 393. 

 Truncatdla subcylhulrica Gray in Turton's Man. p. 22, f. 6. 



Shuttleworth, Diagn. 7, p. 154. 



Pfeiffer, Mon. Auric. Viv. 187; Mon. Phan. Viv. ii. 7. 



Orbigny, Moll. Cub. ii. p. 5, (excl. T. truncahda.) 

 Truncatdla truncaiula Lowe, in Zool. Proc. 1845, p. 217 ? ; in Zool. Journ. V. 



p. 299, tab. 13, figs. 13-18. V 

 Truncatella Caribcetnsis Pfeiffer in Zeitsch. f. Mai. 1846, p. 182, ex pai-te. 

 KijsTER in Chemn. ed. 2, Auric, pi. ii. figs. 1-4. 



DESCRIPTION. 



Animal not observed. 



Shell scarcely perforated or grooved, cylindrical, with 

 crowded numerous ribs, sometimes quite imperceptible, 

 and sometimes perceptible at the suture alone, shining, 

 pellucid, light horn-color; four remaining whorls, rather 

 convex, flattened at the middle, regularly increasing, the 

 last one not prominently carinated at its base ; aperture 

 vertical, large, oval, with an angle above, spreading below ; 

 peristome slightly thickened, its outer margin slightly drawn 

 out, reflected at the columellar, and thickened. 



Length, 5 ; breadth, 2 millimetres. Aperture 2 mill, 

 long. 



Geographical Distribution. Found among rubbish from 

 Florida Keys. Also is a common West Indian species. 



Remarks. I have given the figure from Chemnitz to 

 which Pfeiffer refers. Kiister confoanded it with the pre- 

 ceding species, from some forms of which it appears very 

 difficult to separate it. Orbigny refers it to T. truncatula, 

 a species described by Lowe from Madeira. 



The shell of which the base is given (fig. 8) was found 



