330 SHELLS AND SHELL-FISH. PART II. 



Lucernella Sw. Shell small^ striated ; outer lip with 

 marginal^ not internal, teeth ; inner lip with an ele- 

 vated toothlike plate; umbilicus generally pervious. 

 L. hippocastaneum. Chem. 209. f. 2055, 2056. 



Polygyra."^ Shell completely discoid ; no pillar ; aper- 

 ture angulated and margined ; a small tooth on the 

 inner lip. 



P. septemvolvus. Sow, Man. carabinata. Bow. Conch, 

 f. 275, 276. pi. 7. f. 1 9. 



Lucidella Sw. Sub-trochiform ; spire conic, and sud- 

 denly pointed ; outer lip with marginal tuber culated 

 teeth, t 



L. aureola. Zool. Journ. i. pi. 6. f. 15. 



PusiODON Sw. Shell flattened, smooth ; the body- 

 whorl large, and much dilated at the aperture ; spire 

 small, flat, of three or four contracted whorls ; aper- 

 ture very oblique, sinuated, or obsoletely toothed at 

 the base of the outer lip, which is spreading and sub- 

 reflected ; inner lip obsolete ; umbilicus open, 

 zonaria. Chem. 132.f. 1188. auriculata. Zool. 111. i. pi. 6. 



Thelidomus Sw. Shell coarsely granulated; body- 

 whorl and spire as in the last genus ; but the former 

 is more ventricose, and the latter more raised, and 

 somewhat distorted ; outer lip thickened and reflected ; 

 the base broad and flattened, sometimes with granu- 

 lated marginal teeth ; umbilicus none. 

 T. (Helix) striolata Guild, also Fer. Moll. 44. f. 1-4. 



SuB-FAM, 3. HELICIN^E. Common Land Snails. 

 Shell ventricose, turbinated ; the aperture transversely 

 oval, never toothed ; the body- whorl large and ven- 

 tricose. | 



Helix. Linn. Shell globose, turbinate ; body-whorl 

 ventricose ; spire slightly raised, obtuse. 



* I find this name as above quoted, but no mention is made in the text of 

 whose genus it is. 



+ I have been obliged to designate what seem to be the types of this ge- 

 nus, in order to show more clearly its union, on one side with Cyclostoma, 

 and on the other with Clausilia, or the toothed division of the AcHATiNiE . 

 Mr. Gray's valuable paper may be consulted with much advantage 



t Except in Pupa, which has teeth, and a small body-whorl. 



