297 



VERTIGO MOULINSIANA (Dupuy). 



By J. R. LE B. TOMLIN, M.A., and The Rev. E. W. BOWELL, M.A. 



(Read before the Society, March loth, 1909). 



{ Concluded from page 21 j). 

 Plate V. 



Since the former part of this paper was submitted to the Society, 

 we have received through Mr. A. S. Kennard several specimens of 

 Vertigo ventricosa Morse. We owe these to the kindness of Mr. 

 Bryant Walker, of Detroit, Michigan ; they have been determined as 

 V. ventricosa by Dr. Sterki. As we had supposed, judging from 

 Binney's description, they turn out to be totally different from our 

 species. We think it well to give Morse's original description, citing 

 it from Binney, as we have not access to the magazine^ in which it 

 appeared. 



Shell umbilicate, ovate-conic, smooth, polished; apex obtuse; 

 suture deep ; whorls four, convex ; aperture semicircular, with five 

 teeth, one prominent on the parietal margin, two smaller on the 

 columellar margin, and two prominent within, contracting the aper- 

 ture at the base; peristome widely reflected, the right margin flexuose, 

 within thickened and coloured. 



Length, '07 inch ; breadth, '045 inch. 



The accompanying figures of the shell of V. ventricosa^ drawn from 

 the specimens sent by Mr. Bryant A^"alker, have been reduced to the 

 same scale as the drawings illustrating the former part of this paper. 



Tlie raduli^ of V. moidinsiana, V. lilljeborgi, and V. ventricosa are 

 figured on the accompanying plate. Tor the first two species Mr. 

 R. A. PhiUips most kindly supplied the material. \\'e have also 

 examined specimens of the radula of V. moiilinsiatia from several 

 other localities, and find them to agree with that figured here. Entire 

 half-rows of the unci of V. lilljeborgi and V. ventricosa are given ; 

 V. moulinsiana has about twenty-five pleural unci, of which the first 



1 .\nn. N.V. Lye, viii., i, figs. 1-3 (Nov., 1865). 



