153 



Esq., and from Stone, from the Rev. J. B. Reade, did 

 not vary from those found in this neighbourhood. 



Described by Mr, Morris, as found fossil, with mam- 

 malia, at Grays, Erith, Copford, Sutton, or Ilford, on 

 the banks of the Thames, near London. 



AURICULIDCE. 



With but one exception inhabitants of brackish 

 water. The shells arevolutlform, having mostly denti- 

 culated mouths. The animals possess broad heads, 

 with two nearly triangular horns. 



CONOVULUS. 



Spiral shells, aperture entire and denticulated, peris- 

 tome thickened. We are deficient of this family; they 

 comprise only two species, viz.: — 



Conovulas bidentatus, widely spread, above high 

 water mark. 



Conorulus denticulatus, in the S. of England in a 

 similar situation. 



Carychium. 



Only a single representative of this minute family is 

 an inhabitant of Great Britain. It possesses a spiral 

 cylindrical shell with a denticulated aperture. 



