388 



The fame author has alfo erred in callingthe operculum 

 of this fhcll teftaceous, for it is of a flexible, corneous 

 fubftance, v/rinkJed concentrically, and of a pellucid, 

 reddifli-brown colour. 



The aninaal is viviparous, and very prolific ; we have 

 taken a great number of young ones from the larger 

 faells, each with their teflaceous covering and operculum. 



Shells, not half grown, have the fplres lefs produced, 

 and their volutions not fo tumid ; in which Hate it has 

 been taken for a diflincl fpecies; and we confider the 

 //. compadilis of Doftor Pulteney, and the fhell figur- 

 ed by Mr. Pennant, without number, in plate 85, to 

 be no other. 



The vivipnra is the ftrongefl: frefh-water fhell in En- 

 gland, capable of bearing, for a time, the rude aciions 

 of the fea ; fo that it is fometimes found on our more ex- 

 pofed {bores ; we have dredged it up from the deep at 

 Torcrofs, inhabited by Cancer Bernardus. The mod 

 contiguous river is the Dart, at the diftance of fix miles,^ 

 apparently too rapid for fuch fhells : pofTibly they inha- 

 bited a lake of frefli-water contiguous, which a few years 

 fi nee broke its bounds, and made a temporary junflion 

 with the fea: it has not, however, occurred in any of the 

 rivers in DevovJJiirc. 



Helix 



