GASTEROPODA. 129 



10. TitocHus Montacuti. W. Wood. Tab. XIV, fig. 1, a— b. 



TaocHUa Montacuti. W. Wood. Ind. Test. Sup. t. 6, fig. 43, 1828. 



ua-coniEus (?). Phil. En. Moll. Sic. vol. i, t. 10, fig. 17, 1836. 



— tukgidulus. Dubois de Montp. Wolhyn. Podol. p. 40, pi. 2, fig. 29-30. 



— Montacuti. S. Wood. Catalogue 1842. 



_ _ Thorpe. Brit. Mar. Conch, p. 255, fig. 18, 1844. 



Tr. Testa conicd, elevatd, obtusiusculd, crassd ; anfractibus contiguis, planiusculis, 

 ultimo anfractu obtuse angulato ; transversim striatis ; umbilico clauso, interdum perforate ; 

 aperturd subquadratd ; columella obsolete unidentatd ; labro acute, obliquo. 



Shell conical and elevated ; spire slightly obtuse, thick, and strong ; whorls 

 five, flat, transversely striated ; base of volution obtusely angular ; umbilicus 

 generally covered ; aperture subquadrate ; columella with an obsolete tooth ; outer 

 lip sharp and oblique ; lines of growth visible, slightly raised. 

 Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Sutton. Recent, Britain. 



This is by no means a rare shell in the Coralline Crag ; but I have met with 

 only one specimen from the Red Crag. The volutions are rather flatter, and the 

 base more angular, in the recent specimens which I have seen ; with the exception 

 of these slight differences, they perfectly correspond, and the Crag shell may, I 

 think, be considered as identical with the recent species. When quite perfect it 

 has slightly reflected lines of growth, and bears a great resemblance to some 

 varieties of T. Adansoni, and among my fossils fhey can scarcely be separated. 

 Remains of the colour which originally ornamented the shell are visible on one of 

 my specimens, crossing the lines of growth at an angle of about 45°. 



11. Trochtjs Adansoni. Payr. Tab. XIV, fig. 3, a — c. 



Tkochus Adansoni. Payr. Catal. ties Moll, de l'lle de Corse, pi. 6, fig. 7-8, 1826. 



— — Phil. En. Moll. Sic. vol. i, p. 182, 1836. 



— adriaticus. - - - vol. ii, p. 153, t. 25, fig. 10, 1844. 

 octosulcatus. Nyst. Coq. foss. de Belg. p. 381, pi. 38, fig. 1, 1844. 



Tr. Testa convexo-conicd, obtusiusculd, crassd ; anfractibus planiusculis, transversim 

 striatis, vet cingulatis, crenulatis ; ultimo anfractu obtuse angulato; columella obsolete 

 unidentatd ; umbilico tecto, aliquando perforate. 



Shell convexo-conical, thick, and strong, with rather flat sides, striated or 

 ridged transversely; stria? crenulated or imbricated; base of the last volution 

 obtusely carinate ; aperture subquadrate, with a sharp outer lip, and an obsolete 

 tooth upon the columella ; umbilicus generally covered, sometimes open. 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Sutton. Recent, Mediterranean. 



This is a very abundant shell in the Coralline Crag. Some specimens are 



17 



