LIMN^US. 



body whorl is large and broadly tumid in the middle, 

 displaying a capacious sub-pyriform mouth. Length 

 two-thirds of an inch, breadth one-half. 



var. LACUSTRIS. Forbes and Hanley remark, (Hist. 

 B. M., vol. IV, p. 175,) "With some hesitation we 

 annex as a variety of this species, Limnceuspereger, var. 

 4, (lacustrisj of Gray's Manual. The apex is eroded, 

 not quite sunken, and yet barely elevated above the 

 body whorl, the pillar is much appressed. It is not 

 improbable that this and the typical Burnetti may 

 prove in the end to be the abnormal forms of pereger" 



Hob. Deep water, lakes, &c. 



L. STAGNALIS. LinncBUs. PL VII, fig. 34. 



Shell conic, ovate ; spire long, beautifully turreted and acute ; 

 whorls six or seven, the lower ones much inflated, displaying a capa- 

 cious pyriform mouth. 



Helix stagnalis, Linn.,, fyc. 



This most elegant Limnceus is often an inch and a 

 half in length, and an inch in breadth ; the shell is of 

 a greyish white colour ; the spire produced and conical, 

 consisting of six whorls which are convex and turned , 

 at times subangulated, separated by an oblique profound 

 suture. The mouth is usually pyriform. Outer lip 

 large in full grown specimens, and flattened in the 

 middle. This shell varies much in size and thickness. 

 It almost always presents a more or less lunated ap- 

 pearance. 



var. FRAGILIS, much smaller and thinner, the body 

 not so large and more regularly convex ; spire longer 

 in proportion, the whorls of which are more regularly 

 convex and depressed, not lineated. It somewhat 

 resembles the young of stagnalis, but is found separate 

 and distinct. Animal olivaceous yellow, paler beneath. 



Hob. Common in most parts of England, except 

 the south west and some of the mountainous districts ; 

 the variety is somewhat more local and gregarious in 

 its habits. We have found them abundantly in the 

 south of Durham, and north of Yorkshire. Stagnant 

 and slow waters. 



r 2 



