62 EOCENE MOLLUSCA. 



No. 14. Helix Vectiensis. F. E. Edwards. Tab. X, fig. 8 a — e. 



H. testa orbiculato-depressd, umbilicatd ; superjicie punctulis minutissimis confertis 

 aspersd ; spird parum elevatd ; an/ractibus quinque sub-rotundatis, suturis depressis ; 

 aperturd semi-ovali, peristomate reflexo : umbilico prof undo, semi-obtecto . 



A somewhat convex shell, having the surface thickly covered with minute punctules. 

 The slightly elevated spire is composed of about five bluntly convex whorls, depressed 

 at the sutures. The aperture is semi-ovate, having the margins strongly reflected ; 

 that of the inner lip partly covering the umbilicus, which is deep and moderately wide. 

 The shells, when in the young state, are, like many others in this genus, slightly 

 carinated. In the general contour, this species much resembles the recent H. rufescens, 

 but it is distinguished as well by the punctulated surface, as by the less rounded 

 whorls, the more strongly reflected peristome, and the larger umbilicus. 



Casts in the Limnsean limestone at Sconce are not uncommon ; but specimens 

 with the shell preserved are rare. The casts may be separated from those of 

 H. LfTIrbani, with which, at first sight, they are liable to be confounded, by the 

 narrower umbilicus, and frequently by the impression of the reflected lip of this 

 species. Where the shell is preserved, the punctulated surface presents a character 

 by which it may be at once distinguished. 



Diameter, 4-10ths of an inch ; elevation, 2-10ths in. 



Localities. — Sconce near Little Yarmouth, and Headon-Hill, Isle of Wight. 



No. 15. Helix D'Urbani. F. E. Edwards. Tab. X, fig. 5 a— d. 



H. testa orbiculato-depressd, lavi, umbilicatd : spird subprominuld ; anfractibus guinque 

 aut sex sub-rotundatis ; suturis perspicuis : aperturd semi-ovali, peristomate simplici ; 

 umbilico magno. 



A smooth, depressed, umbilicated shell, with a slightly elevated spire ; the five or 

 six volutions of which it is composed are bluntly convex, and the upper edges are so 

 much depressed as almost to present a channel at the suture ; the aperture is semi- 

 ovate, with a perfectly simple unreflected lip ; the umbilicus is wide, disclosing the 

 volutions within. 



This species somewhat resembles H. Lemani of Brogniart, but the spire is less 

 elevated, and the umbilicus is more open. 



The smooth and polished surface, which barely shows the lines of growth, and the 

 sharp lip prevent its being confounded with H. Vectiensis. When young, the whorls 

 are slightly carinated. A variety occurs in which the spire is much depressed, and 

 the whorls consequently assume a less bluntly convex form. 



