ACHATINA. 295 



in the moutli being much larger and never furnished with 

 teeth or folds. 



It seems not to have escaped the keen notice of Lister. 

 Whether Linne was also acquainted with the present 

 species is another question. Some writers consider it to 

 be the Helix subcylindrica of his ^ Systema Naturae ; ^ but 

 that shell is described as inhabiting fresh water and 

 having the inside lip or margin of the aperture reflected, 

 neither of which characters is applicable to C. lubrica. 

 It is, however, the Turbo glaber of Da Costa. 



Genus XI. ACHA'TINA*, Lamarck. 

 PI. VII. f. 18, 19, 20, 21. 



Body long and slender, always containable within the shell : 

 tentacles 4 ; upper pair having small bulbs ; lower pair exceed- 

 ingly short : foot narrow. 



Shell long and cylindrical, thin, glossy and smooth : ivhorls 

 rapidly increasing in size : spire long : mouth oval or oblong, 

 without teeth or folds, but notched and nearly truncate at the 

 base : outer Up thin and plain : umbilicus wanting. 



L. Pfeifter described, fourteen years ago, no less than 

 157 species of Achatina ; and in these days of species- 

 making and foreign enterprise, we may fairly assume 

 that this number has since been considerably increased. 

 In our own country we have only a solitary representa- 

 tive of this numerous genus, and that scarcely exceeding 

 in length one-sixth of an inch. Risso constituted out 

 of this minute species a new genus, which he named 

 Acicula. Beck proposed another genus [Ccecilio'ides) for 

 its reception ; and Bourguignat has, in his ^ Amenites 

 Malacologiques,^ given another generic name [Cceciliu- 

 nella), as well as divided our species into several. One 

 of these species he has caUed " Anglica" and distin- 



* Agate. 



