GASTEROPODA. 129 



10. Trochus Montacuti. W. Wood. Tab. XIV, fig. 1, a — h. 



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



— LEUCOPHEUS (?). Phil. En. Moll. Sic. vol. i, t. 10, fig. 17, 1836. 



— TURGIDULUS. Bubois de Monip. Wolhyn. Podol. p. 40, pi. 2, fig. 29-30. 



— Montacuti. S. TTood. Catalogue 1842. 



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



Tr. Tesfd conicd, elevafd, obfusiusculd, crassd ; anfractibus contiguis, planiusculis, 

 ultimo anfracfu obtuse angulato ; tramversim striatis ; umbilico dauso, interdum perforata ; 

 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 angular ; umbilicus generally 

 covered ; aperture subquadrate ; columella with an obsolete tooth ; outer lip sharp 

 and oblique ; lines of growth visible, slightly raised. 



Axis, J 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 

 diS"erences, they perfectly correspond, and the Crag shell may, I think, be considered as 

 identical with the recent species. When quite perfect it has shghtly 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 Unes of growth 

 at an angle of about 45°. 



'O' 



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



Tkochds Adansoni. Payr. Catal. des Moll, de I'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. Testd convexo-conicd, obtusiusculd, crassd ; anfractibus planiusculis, transversim 

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

 unidentatd; umbilico tecto, aliquando perforata. 



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 columeUa ; 

 umbilicus generally covered, sometimes open. 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. 



Red Crag, Sutton. Recent, Mediterranean. 



17 



