GASTEROPODA. 127 



Shell conical and elevated, with seven volutions ; upper part slightly concave ; 

 lower part convex, covered with about seven transverse granular ridges, and one small 

 intermediate thread ; base rather flat, concentrically striated ; aperture trapezoidal. 



Axis, 1 inch. 



LocaUfy. Red Crag, Sutton, Newbourn, and Walton Naze. 



This species is by no means rare. It is presumed to be distinct from the preceding, 

 from its being much more elevated, and from its having the upper half of the volutions 

 deeply indented or concave. The variety fig. 8 c resembles T. 2M2nUosus, but is more 

 elevated. It is only a different form of this species, if it be distinct ; it is, however, 

 possible they may be varieties of T. papilloms, but among my numerous specimens 

 there are none that will fairly unite the two. 



7. Trochus millegranus. Phil. Tab. XIII, fig. I, a — h. 



Teochus millegranus. Phil. En. Moll. Sic. vol. i, p. 183, t. 10, fig. '25, 1836. 



— — ... vol. ii, p. 154, 1844. 



— — Thorpe. Brit. Mar. Conch, p. 2(;4, fig. 36, 1844. 



— Maktini. Smith. Wern. Trans, vol. viii, p. 99, t. 1, fig. 26, 1838. 



— ELEGANs. Jeffreys. MS. 



Tr. Testa conicd, elevatd ; anfradibus planatis, subimbricatis ; basi marffinatis, pro- 

 minidis ; idtimo anfradu angulato ; transversim lineatis, lineis elevatis granulatis ; basi 

 plaiiiusculd, striata ; aperturd rhomboided. 



Shell conical, elevated, thick, and strong ; whorls flat, transversely striated, anil 

 granulated, with a carinated and marginated edge; base rather flat and striated; 

 aperture rhomboidal. 



Axis, I of an inch. 



Locality. Cor. Crag. Recent, Mediterranean and Britain. 



By a comparison with a recent specimen from the Mediterranean, given to me by 

 Prof. Forbes, the Crag shell appears to agree with the recent species in most of its 

 characters, although it has lost a good deal of its granulated exterior ; the transverse 

 ridges on the lower part are nearly smooth. It has a prominent line at the lower part 

 of the volution, and a very slight thickenmg at the base of the columella. Prof. 

 Forbes, who has seen my specimens, agrees with me in thinking that it is only an 

 altered form of T. millegranus. 



8. Trochus multigranus. S. Wood. Tab. XIII, fig. 3, a — b. 



Trochus aspeeulus. S. Wood. Catalogue 1842. 



Tr. Testd conicd, elevatd, crassd ; anfradibus 5 — 6, p)^o.niuscuUs (jranidatis ; basi 

 marginatis, p)Tominulis ; idtimo anfractu subangulato ; transversim lineatis, lineis elevatis 

 granulatis, non imbricatis ; basi planiusculd ; colmnellii ohliqud, obsolete unidentatd. 



Shell conical, elevated, thick, and strong ; volutions 5 — 6, rather flat, ornamented 

 with 6 — 8 transverse granulated ridges ; last whorl subangulated ; base somewhat flat, 

 and a thickened or obscurely -toothed columella ; aperture trapezoidal. 



