PART II. ACHATIN^. 335 



gined and reflected; aperture without teeth^ rarely 



with a single fold.* 

 Aui'icula Lam. Body-whorl sub-ventricose ; spire 



short ; the whorls few ; pillar with one or two plaits ; 



outer lip margined and reflected. 

 Sileni. En. Meth. 460. f. 4. leporis. Lam. {fig. 27. p. 181.) 



Bulimus Lam. Outer lip thickened and reflected ; 

 spire short ; pillar smooth, 

 melanostomus. Zool. 111. i. 4. Australis. Bow. C. 8. f, 30. 



Bulimulus Leach. Outer lip thin, or sub-reflected ; 

 spire equal or rarely longer than the aperture. 



undulatus Guild. Zool. J. iv. 169. Antiguensis. lb. 

 stramineus. lb. iv. 170. Proteus. lb. 



Leptospira Sw. Spire excessively long, sub-cylindrical; 

 body-whorl largest ; outer lip thickened ; aperture 

 oval ; no teeth, 

 striata Sw. Chem. 135. f. 1226. signata Sw. {fig. 97. a,h.) 



Goniostoma Sw. Spire elongated, of few whorls ; aper- 

 ture contracted at each end ; lips margined ; the 

 pillar curving inwards ; the base slightly notched. 

 T. erubescens Sw. Zool. Journ. i. pi. 5. f. 2. t 



3. AcHATiNA. Outer lip always thin ; base of the 

 piUar truncated, or sinuated, before it joins the outer 

 lip. 



Macrospira GuUd.J Spire excessively long, sub- 

 cylindrical ; body-whorl largest ; outer lip thin ; 

 aperture oval. 

 M. octona. (Helix octona Auct.^ aperta Guild, (fig. 97. e,f.) 



Cochlycopa\ Fer. Oblong; body-whorl slender; sur- 

 face striated ; spire variable ; outer lip with a promi- 

 nent lobe near the base. 



C.glans. Chem. 117. f. 1009, 1010. 



* Only in Auricula. 



f The singular lateral position of the aperture is not expressed in this 

 figure. See^^. 25. p. 177. 

 X Subsequently named, inadvertently, Chionella, by Mr. Jeffreys. 

 § Very properly substituted by Ferussac for Polyphe7nus. 



