125 



NATICA cirriformis. 



TAB. CCCCLXXIX.— /g^. 1. 



Spec. Char. Globose ; whorls slightly compressed 

 laterally^ spire conspicuous ; umbilicus larg-e, 

 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 

 ill 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 Suflfolk Crag by Mrs. Cob- 

 bold, whose valuable collection contains the specimen 

 tieured. 



NATICA hemiclausa. 



TAB. CCCCLXXIX.— /g-. 2. 



Spec. Char. Subglobose ; spire small, conical^ 

 pointed ; umbilicus half closed by the superior 

 part of the columellar lip ; aperture oval. 



OH ELL 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. 



