178 DESCRIPTION OF SHELLS. 
Ampullina pachycheila. (Tab. VI. fig. 31.) 
Spec. Cuar.—Globose, with a very small spire; aperture semicircular, 
pointed above, rounded with a reflected lip below, the left lip thick and pressed 
more or less into the umbilicus ; shell thick. 
Very rarely found of a regular form: the shell, although very thick, seems to 
have lost all its animal matter, and to have yielded very readily to pressure in 
the wet, sandy clay. 
Natica Hantoniensis. (Tab. VI. fig. 20.) 
A somewhat distorted variety of this shell is figured; the reference has 
accidentally been omitted in the List. 
Natica turgida. 
Spec. Cuar—Oblong-ovate, with straightish sides, smooth; spire of three 
convex whorls, small, produced ; last whorl elongated ; aperture oval, elongated 
with a curved canal forming its upper angle; the left lip expanded over the 
preceding whorl, thickened and nearly closing the umbilicus, below which the 
edge is rounded and thick. 
Length $ to $ of an inch. 
This shell has a peculiar appearance in consequence of the great size and 
length of the last whorl; the left lip is large and regularly thickened, and in 
general nearly closes the umbilicus ; but there is a variety greatly resembling in 
form the variety of Globulus labellatus, fig. 27, which has an open umbilicus, 
and at the lower part of the thickened lip a transverse furrow, of which slight 
traces only can be found in the variety with a closed umbilicus. Both varieties 
are in Mr. Edwards’s Cabinet, where they were recognised too late for insertion 
in the plate. 
Natica obovata. (Tab. VI. fig. 28.) 
Spec. Cuar.—Obovate, with a small pointed spire, and the last whorl convex, 
umbilicate ; aperture nearly round, its left lip spread almost over the umbilicus, 
thickened at the upper part. 
An imperfect specimen, which I can refer to no other species. 
The three genera Globulus, J. DeC. Sowerby, Index ‘ Min. Con.’ (Globularia, 
