380 



This fpecies was firfl noticed as an EngHjIi fliell by- 

 Mr. Boys, who with his ufiial liberaHty, favoured us 

 with feveral fpecimens, together with remarks upon its 

 natural hiftory. It is an aquatic fpecies, and not uncom- 

 mon in tlie marflies at Deal. 



The animal is pofTeifed of only two flat, triangular, 

 tentacula, with the eyes at the bafe : and when undif- 

 turbed, covers its fliell with a fine tranfparent membrane. . 



Is found on the leaves of the yellow water lill}', 

 Nymphcza liitca. 



We are inclined to believe this is a very local fliell in 

 England, though poffibly may have been overlooked as 

 the young of the auncularia ; from which, however, it is 

 eafily difcriminated by its almoft membranaceous tex- 

 ture, obtufe, and depreffed ^/>^,?(;; as well as being defli- 

 tute of the fub-uvibilicus formed by the repand lip of 

 that fliell : the animal too, is effentially different. 



9. 

 LuTEA. H. with a fub-oval, fub-pellucid, moderately flrong. 



Tab. 16. f. 6. fmooth fliell, of a dull orange-yellow colour: volutions 



fcarcely three, the firfl extremely large, the others very 



- fmall : apex obtufe, not prominent : aperture patulous, 



oval ; outer lip not attenuated ; inner lip pretty flrong, 



and a little fp reading on the Columella. Length nearly 



half an inch ; breadth rather more than a quarter. 



This 



