328 SHELLS AND SHELL-FISH. PART 11. 



ViTRiNA Drap* Mantle with a double border ; the 

 upper one lobed, and folded back upon the shell ; 

 posterior part of the body obtuse, truncate ; shell 

 slightly turbinate, thin, ear-shaped, polished ; too 

 small, in general, to contain the animal. 

 V. pellucida, Drap, Moll. 



Stenopus Guilding. Body linear, long ; the disk very 

 narrow, superior ; tentacula thickened, clavate ; shell 

 thin, nearly discoid, nearly equal to the animal. 

 S. cruentatus Guild. Zool. Journ. iii. pi. 15. f. 1 — 5. 



SucciNEA DrapA Shell nearly equal 

 to the animal ; oblong, thin ; spire 

 short, pillar none ; aperture very 

 large. 



S. amphibia. Sow. Man. f. 265. {jig. 96.) 



SuB-FAM. 2. LUCERNIN^E. Land Volutes, or Lamp Snails. 



Shell discoid ; the spire scarcely raised ; the substance 

 solid ; surface either granulated or striated ; aperture 

 generally toothed. 



Leiostoma Sw. Shell patulous; the aperture very 

 large and wide ; spire of only two or three small 

 whorls ; outer lip reflected. 



Leiostoma Sw. Surface granulated ; a transparent 

 glazing extending far beyond the inner lip. 



gigantea. Fer. 15. f. 5, 6,7. vesicalis. Chem. 208. f. 2051, 

 Jamaicensis. lb. 14. f. 6—8. 2052. 



LucERNA Humph. Shell discoid, of several graduated 

 whorls ; the surface granulated ; the spire slightly 

 elevated ; circumference carinated ; teeth, Avhen pre- 

 sent, on the outer lip only. 



Caracolla Lam. Aperture circular ; the two lips united; 

 teeth none ; umbilicus open, 

 lapicida. Chem. f. 1107. tectiformis. Zool. J. i. pi. 3. f. 6. 



* The sub-genera remain to be determined, 

 f The same remark. 



