62 EOCENE MOLLUSCA. 
No. 14. Het1x Vectiensis. F. #. Hdwards. Tab. X, fig. 8 a—e. 
H. testa orbiculato-depressd, umbilicatd ; superficie punctulis minutissimis confertis 
aspersd; spird parum elevatd; anfractibus quinque sub-rotundatis, suturis depressis ; 
apertura semi-ovalt, peristomate reflexo : umbilico profundo, 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 Limnzean limestone at Sconce are not uncommon; but specimens 
with the shell preserved are rare. The casts may be separated from those of 
H. D Urbani, 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. Her1x D’UrsBani. F. 2. Edwards. Tab. X, fig. 5 a—d. 
H, testa orbiculato-depressd, levi, umbilicatd: spird subprominuld; anfractibus quingue 
aut sex sub-rotundatis ; suturis perspicuis: aperturd semi-ovali, peristomate simplict ; 
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. Zemani 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 /. 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. 
