:252 LEPTOTHYRA. 



ficial ; base slightly excavated at the position of tlie umbilicus ; aper- 

 ture oblique, circular ; peristome white, thickened. 

 . Alt. IJ, diam. 1] mill. (Martens.) 



Mauritius. 

 L. FOLiNi Pilsbry, ] 888. PL 57, fig. 58. 



Shell minute, turbinate, subglobose, vivid blood red ; whorls 4, 

 the first depressed, subcarinated, apical Avhorl subcostate, transverse- 

 ly lirate, l.irse rounded, the wide interstices regularly minutely 

 transversely striate ; last whorl large, umbilicate ; aperture sub- 

 circular, right margin somewhat thickened, the left reflexed ; colu- 

 mella simple, arcuate. Alt. 1*2, diam. 1'5 mill. 



3fauritius. 



This is Turbo sanc/ui)iei(s de Folin, (preoc.) 



L. sEMiLUGUBiiis Dcsh., 1863. PI. 58, fig. 52«. 



Shell small, turbinate, subglobose, white, marbled with black ; 

 gpire somewhat obtuse ; whorls 5, declivous above, spirally deeply 

 sulcate, the sulci subgranulose ; last whorl large, base perforate ; 

 aperture circular, pearly within, very oblique ; columella arcuate, 

 flat, truncate anteriorly. Alt. 3, diam. 3 mill. 



Mauritius. 

 L. CAKiNATA Cantraine, 1835. PL 63, fig. 35. 



Shell subconie, thick, glabrous ; upper whorls carinated, the last 

 depressed above, lightly striate in the median portion ; base smooth, 

 shining. (Cantraine.') Alt. 10, diam. 11 mill. 



Mediterranean and Bay of Biscay, 125 to 7 SI fins. 



Also found in the Italian and Sicilian Tertiary. 



Troehus carinatus Cantr., Bull. Soc. Roy. Bruxelles, 1835, p. 387. 

 (not Troehus carinatus Borson, Mem. Ac. Torino, 1822, which is ap- 

 parently a species of Astralium.) 



Troehus glahratus Phil., Fauna Moll. SiciL, 1844, is synonymous. 



This deep water form of the Mediterranean and adjacent Atlan- 

 tic, seems to be specifically identical with the Western Atlantic 

 shells dredged by the Challenger and the Blake and describ- 

 ed under the names T. indutiis Watson and L. albida Dall. I 

 have before me specimens of the latter form which correspond very 

 nearly .with Cantraine's figures. 



Var. peloritana Cantraine, 1835. PL 63, fig. 34. 



Shell subconie, thick, very lightly striate, transversely subcostate 

 the costse subgranose ; whorls convex ; base shining, smooth. 



Alt. 12, diam. 13 mill. (Cantraine.) 



Troehus filosns Phil., 1844, is synonymous. 



