328 SHELLS AND SHELL-FISH. PART II. 



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 Drap A Shell nearly equal 

 to the animal ; oblong, thin ; spire 

 short, pillar none ; aperture very 

 large. 



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



SuB-FAM, 2. LUCERNINxE. 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. 



LucEBNA Humph. Shell discoid, of several graduated 

 whorls; the surface granulated; the spire slightly 

 elevated ; circumference carinated ; teeth, when 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, 

 t The same remark. 



