ACHATINA. 295 



in the mouth 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 subcylmdrica of his l 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 XL ACHA'TINA*, Lamarck. 

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



BODY long and slender, always containable within the 

 shell : tentacles 4 ; upper pair having small bulbs ; lower 

 pair exceedingly short : foot narrow. 



SHELL long and cylindrical, thin, glossy, and smooth : whorls 

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

 without teeth or folds, but notched and nearly truncate at 

 the base : outer lip thin and plain : umbilicus wanting. 



L. Pfeiffer 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 (Cceeilio'ides) for 

 its reception ; and Bourguignat has, in his l Ame'nite's 

 Malacologiques,' given another generic name (Ccecilia- 

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

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



* Agate. 

 2D 



