188 



POPULAR CONCHOLOGY. 



fixed permanently to the shell. Turton mentions five 

 or six as natives of England. Many of the species are 

 sinistral. 



Lychnus. Mather on. — Shell resembling when young 

 a JVatica, at a later period a Helix, when the last whorl of 

 the shell allows the first only to be seen obliquely ; the 

 edges of the lips are folded back. — 2 species. 



The species are known in the shallow fresh water at the 

 mouth of the Rhone. D'Orbigny places them with Tomi- 

 gerus. 



Family 4. — A URICULA CEA. 



The body of the animals of this family can be entirely 

 withdrawn into a spiral-formed shell, the aperture of which 

 is narrow, and the inner lip is beset with thick plaits. 

 The head has two conical tentacula, with the eyes at 

 the base ; no operculum. — Terrestrial, but living in damp 

 places. 



Scarabus. Montf. (Pythia Schum. ; Polydonta 

 Fischer.^) — Shell ovate; spire obtuse; whorls 

 flattened; the last sometimes turned abruptly, 

 forming an angle ; aperture oval ; teeth on 

 both lips, the outer lip a little expanded ; this 

 expanded lip forms a varix on every half whorl, 

 giving a very peculiar appearance to the shell. 

 Animal described in the family. — 10 species. 



Found at the roots of trees in woods in the East Indies, 

 and in the islands of the Pacific. 



Auricula. Lam. — Shell oval, or lengthened, the 

 whorls not flattened; the aperture small, not notched at 

 the lower part, at the upper part contracted ; the colu- 

 mella beset with one or several folds ; the outer lip 

 with no folds, sharpened, or thickened, and somewhat 



