176 LIMNJEAD^.. 



depressed in the middle ; its edge peculiarly sinuous, alter- 

 nately receding and advancing, the latter chiefly below the 

 middle. Inner lip bending to the left ; pillar lip reflected 

 and raised so as to form an obliquely arcuated prominent 

 fold. Labial enamel appressed even to its extremity so as 

 not to form any umbilicus. Our foreign examples measui'e 

 two inches at the least in length, and fnlly an inch across ; 

 British examples rarely attain to such dimensions. 



Var.//'«r/i7<s smaller, the body less swollen, more regu- 

 larly convex and usually more elongated, not at all angu- 

 lated ; the volution not planulate posteriorly. Aperture 

 partaking of the general slenderness ; the marginal sinua- 

 tion of the outer lip much less marked. 



The animal is of a yellowish olive hue, more or less 

 marked with pale opake specks. 



This fine species is abundant in still svater localities, 

 slow running rivers and canals throughout the greater 

 part of England, exclusive of the extreme south-west, and 

 some of the more mountainous districts. It has been in- 

 troduced into a few localities in the south of Scotland. In 

 Ireland it is local, but generally diffused (W. Thompson). 

 It is not found in the Isle of Man.* 



* Turton's figure of his Limneus scaturigiHum (Manual, f. 102) was copied 

 from the Physa ! scaturiginum of Draparnaud (Hist. Moll. pi. 3, f. 14), supposed 

 to be the young oi Acliaiina folliculus. The specimen, " not half a line long," 

 mistaken for this species, was the fry of a Limnceus, and, according to Mr. 

 Jeffreys, of L. stugnalis. 



