GASTEROPODOUS MOLLUSCA OF BERWICKSHIRE. 271 



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

 epidermis raised into mimerous transverse plaits ; whorls six, 

 rounded, ang-ulated at the sutiire and at the base of the body ; 

 aperture white, the pillar narrow, with a slight perforation. 

 Length -Arths ; breadth nearly -^Vths. Turton in Zool. Journ. iii. 

 192. Turbo crassior, Dillto. Eec. Sh. 820. Flem. Brit. Anim. p. 

 299. 



Hah. 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 cyliudraceous, 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. B. communis, 

 Forbes. Faun. Mon. 17. 



Rah. On Fuci between tide marks, frequent. 



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

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

 spiral bands on the l)ody of the shell ; and the whorls are frequently I'ibbed 

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

 and sometimes onlj' to bo 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 ith. Turbo interruptus, Mont. Test. Brit. 329. tab. 20. 

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



Hah. Very common between tide marks. 



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

 the middle of the l)od_v-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 mollusca. 

 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. semistn'atu, shell conical, pellucid, white, with two rows of 

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



