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. 



Awis, 1 inch. 



Localitij. 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. papillosus, 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. jjapillosus, but among my numerous specimens 

 there are none that will fairly unite the two. 



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



Tbochus millegkanus. Phil. En. Moll. Sic. vol. i, p. 183, t. 10, fig. 25, 1836. 



— — ... vol. ii, p. 154, 1844. 



_ _ Thorpe. Brit. Mar. Conch, p. 264, fig. 36, 1844. 



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



— ELEGANS. Jeffreys. MS. 



Tr. Testa conicd, elevatd ; anfractibus planatis, siibimbricatis ; bam marr/inatis., pro- 

 minulis ; ultimo anfradu anyidato ; tramvenim lineatis, lineis elevatis gramdatis ; basi 

 planiusculd, striatd ; aperturd rhomboided. 



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

 granidated, 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 thickening 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 asperulus. S. Wood. Catalogue 1842. 



Tr. Testa conicd, elevatd, crassd; an/ractibus 5 — 6, planiusculis (/ranulatis ; basi 

 marghiatis, prominulis ; ultimo anfractu subangulato ; transversim lineatis, lineis elevatis 

 graimlatis, non imbricatis ; basi planiusculd ; columelld obliqud, 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. 



