GASTEROPODOUS MOLLUSCA OF BERWICKSHIRE. 2?1 



3. L. crassior, shell conical, thickish, covered with a yellowish epi- 

 dermis raised into numerous transverse plaits ; whorls six, round- 

 ed, angulated at the suture and at the base of the body ; aperture 

 white, the pillar narrow, with a slight perforation. Length /gths ; 

 breadth nearly ^ O ths. Turton in Zool. Journ. iii. 192. Turbo 

 crassior, Dillw. Rec. Sh. 820. Flem. Brit. Anim. p. 299. 



Hub. Berwick Bay, rare. 



13. EISSOA. FREMINVILLE. 



Shell conical or turreted, the body-whorl larger than the succeeding ; 

 aperture round or oval, the margin even, continued round the body- 

 whorl ; operculum horny. 



1. R. striata, shell cylindraceous, obtusely pointed, light brown, with 

 six rounded whorls strongly striated in a spiral direction ; aper- 

 ture suborbicular, pointed above. Length th. Turbo striatus, 

 Adams, in Lin. Trans, iii. 66. tab. 13. fig. 25. 26. Mont. Test. 

 Brit. 312. Cingula striata, Flem. Br. Anim. 307- R. communis, 

 Forbes, Faun. Mon. 17. 



Hob. On Fuci between tide marks, frequent. 



Snail with white filiform tentacula, the eyes sessile at their base ; foot linear- 

 oblong, with plain margins. There are often one or two pale yellowish 

 spiral bands on the body of the shell ; and the whorls are frequently 

 ribbed across, the ribs on the body disappearing before they reach the 

 middle, and sometimes only to be traced in a nodulous line along the 

 suture. Worn specimens from shell-sand are smooth and white, with 

 the yellowish bands more distinctly visible. 



2. R. interrupta, shell conical, pellucid, smooth, with five flattish 

 whorls marked with oblong brown spots crossing the upper half, 

 and a spiral band at the base of the body ; aperture suborbicular. 

 Length th. Turbo interruptus, Mont. Test. Brit. 329. tab. 20. 

 fig. 8. Cingula interrupta, Flem. Br. Anim. 308. 



Hob. Very common between tide marks. 



There is a variety of this shell without any spots, but with a white band in 

 the middle of the body-whorl and winding up the spire, though less dis- 

 tinct there. The snail is an active creature, and can swim on the surface 

 of the water in a reversed position like the aquatic pulmoniferous inol- 

 lusca. The tentacula are long, filiform, white, the eyes at their base and 

 sessile ; head bilobate ; foot white, linear-oblong, plain, free anteriorly, 

 and capable of considerable elongation, the anterior portion divided from 

 the posterior by a band distinguished by a difference in its colour, and 

 on each side of it there is a sort of fin or fold of an oblong shape. 



3. R. semistriata, shell conical, pellucid, white, with two rows of 

 brown spots on the rounded whorls, which are spirally striate ; 

 whorls six ; aperture suborbicular. Length ^th. Turbo semi- 



