GASTEROPODA. 129 



10. Trochus Montacuti. JF. Wood. Tab. XIV, fig. 1, a—d. 



Trochus Moxtacuti. TF. Wood. Ind. Test. Sup. t. 6, fig. 43. 1828. 



— LEUCOPiiEus (?). Phi/. En. MoU. Sic. vol. i, t. 10, fig. 17, 1836. 



— TURGIDULUS. Dubois de Motifj). WoLhyn. Podol. p. 40, pi. 2, fig. 29-30. 



— Moxtacuti. S. Wood. Catalogue 1842. 



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



Tr. Testa conicd, elevatd, obhisiusculd, cras-sd ; anfradibus contiguis, planiuscidis, 

 ultimo anfractu obtuse angulato ; fransversim striatis ; iimbilico clauso, interdmn perforato ; 

 aperturd subquadratd ,- columelld obsolete unidentatd ; labro acuto, obliquo. 



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

 flat, transversely striated ; base of volution obtusely angvdar ; 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 they 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°. 



-■o 



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



Trochus Adansoki. Payr. Catal. des Moll, de I'lle de Corse, pi. 6, fig. 7-8, 1826. 



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



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



— ocTosuLCATis. Nijst. Coq. foss. de Belg. p. 381, pi. 38, fig. 1, 1844. 



IV. Testd convexo-conicd, obtusiusculd, crassd ; anfractibus planinsculis, fransversim 

 striatis, vel cingulatis, crenulatis ; ultimo anfractu obtuse angulato ; columelld obsolete 

 unidentatd; umbilico tecto, aliquando perforato. 



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

 transversely ; striae 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. 



17 



