144 



POPULAR CONCHOLOGY. 



(From a description by Hall in the Palaeontology of New 

 York.)— Fossil. 



Cyrtolites. Conrad. — Shell disk-like, the whorls on 

 both sides equally compressed or flat; the whorls in 

 creasing quickly, and sometimes separated from each 

 other; they are sharply keeled at the back, the sides 

 indistinctly so ; the aperture is but little expanded, and 

 square in form. — 4 species, fossil. 



Bankivia. Beck. — Shell turreted, smooth, polished, 

 without epidermis, the whorls almost level; the 

 aperture nearly square; the columella sometimes 

 twisted, at the lower part truncated, the outer lip 

 thin. Animal and operculum unknown. — 1 

 species. 



Pretty shells from New Holland, but the animal 

 not being known, their systematic situation is un- 

 certain. 



Stomatia. HeTblin. (Stomax Montf.) — Shell some- 

 what ear-shaped, the outside generally stri- 

 ated or carinated, with a raised rib ; the in- 

 side very pearly ; the whorls project from the 

 axis ; no operculum. Animal^ foot very large, 

 prolonged behind, the fringe membrane on 

 the left side under the eye stalk, ending in a Stomatia phljmotls - 

 tuft, on the right side prolonged into a fold. — 12 

 species ; also fossil. 



Brought from the East Indies and New Holland. 



Stomatella, Lam. — Shell ear- shaped, 

 regular ; aperture large, oblong, and very 

 pearly ; some species have an operculum, 

 which is thin, horny, and with irregular lay- 

 ers of growth, Animal not differing much 



