428 



It Teems partial to moift fituations, and is generally 

 found on decayed wood, or timber that has lain fome 

 time on the ground. 



Mr. SwAiNSON has this fliell in his cabinet; and, we 

 believe, faid he found it in Kent. 



Animal light coloured, paler beneath ; tentacula four, 

 the fuperior ones not very long, furnilhed with eyes at 

 their tips. 



Lacuna. H. with a thin, pellucid, fub-globofe fliell, of a light 



Tab. 13. f. 6. horn-colour, with four tumid, fmooth fpires, the lirfl 

 large, the two uppermoll very fmall, and placed fome- 

 what lateral : aperture large, fub-oval ; outer lip ex- 

 tremely thin, membranaceous ; pillar lip thick, white, 

 grooved with a long canal or gutter, which terminates 

 in a fmall, but deep umbilicus. Length a quarter of an 

 inch ; breadth nearly the fame. 



The form of the pillar lip, and the lateral fituation 

 of the fmallcr volutions, give this fliell much the ha- 

 bit of a Merita ; but the fliape of the mouth makes it a 

 Helix. It muft not therefore be confounded with the 

 Nerita paUidula, whofe pillar lip is fome what of the fame 

 form, but much broader ; the fmaller volutions more la- 

 teral, and m5re comprefled : the body, and mouth too, 

 are vaftly larger. 



