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NATICA cirriformis. 
TAB. CCCCLXX1X.— fig. 1. 
Spec. Char. Globose ; whorls slightly compressed 
laterally, spire conspicuous ; umbilicus large, 
deep, open ; columellar lip thick with a sinus 
in the middle ; aperture small, oblong. 
The body of this shell is by no means so ventricose as 
in many species of the Genus ; the spire is rather short, 
consisting of about four whorls : the principal character 
is the large umbilicus in which the whorls may be di- 
stinctly seen up to the very apex : it contains no spiral 
ridge ; but the thick columellar lip that in some species 
bends over the umbilicus, is as it were cut away in the 
middle to leave it open. 
A rare species found in the Suffolk Crag by Mrs. Cob- 
bold, whose valuable collection contains the specimen 
figured. 
NATICA hemiclausa. 
TAB. CCCCLXXI X.—Jig. 2. 
Spec. Char. Subglobose ; spire small, conical, 
pointed ; umbilicus half closed by the superior 
part of the columellar lip ; aperture oval. 
Shell longer than wide, with a pointed indistinct spire 
and produced base ; the columellar lip is thick and half 
covers a moderate-sized umbilicus, in which is no spiral 
ridge. 
Not an uncommon Crag fossil : it occurs near Ipswich, 
at Woodbridge, Bramerton, and in several other parts 
of Suffolk and Norfolk, as specimens, received through 
the favour of Mrs. Cobbold, Messrs. Turner and Hooker, 
and the Rev. G. R. Leathes, demonstrate : it has also 
been sent from Placentia, named Nerita helicina of 
Brocchi ; but it neither agrees with his figure nor de- 
scription, and we presume has not been distinguished by 
any specific appellation. 
