TRUNCATELLA. 187 



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

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

 accrescentes, ultimus basi non cristatus ; apertura verticalis, ampla, angu- 

 lato-ovalis, basi subeffusa ; perist. leviter incrassatuni, margine externo 

 subproducto, columellari breviter reflexo, adnato et superne incrassato. 

 (Pfr.) 



SYNONYMS AND REFERENCES. 



Helix wibcylimfrica PULTENEY, Cat. Dorsetsh. p. 49. 



MONTAGU, Test. Br. ii. p. 393. 

 Truncatetta subcylindrica GRAY in Tuvton's Man. p. 22, f. 6. 



SHUTTLE-WORTH, Diagn. 7, p. 154. 



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



ORBIGNY, Moll. Cub. ii. p. 5, (excl. T. truncatula.) 

 Truncatetta truncatida LOAVE, in Zool. Proc. 1845, p. 217?; in Zool. Journ. V. 



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



Truncatetta Caribceensis PFEIFFER in Zeitsch. f. Mai. 1846, p. 182, ex parte. 



KUSTER 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 PfeifTer refers. Kiister confounded 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 



