ACIIATININiE. 131 



Species of Omalonyx. 



appendiculata, Pfeiff. explanata, Gould. 



Bernardi, Recluz. Gayana, ~D*Orh. 



Cumingi, Pfeiff. putamen, Gould. 



depressa, Rang. unguis, D'Orl>. 



Sub-fam. ACHATININ^. 



Shell more or less conoitlal, solid, not horny or trans- 

 parent, the last whorl usually very ventricose; aperture 

 wide ; columella usually more or less truncate at the fore 

 part; outer lip generally simple and acute. 



Genus ACHATTNA, Lamarck. 



Shell oblong-ovate; spire conical, very rarely turreted, 

 last whorl more or less ventricose, nearly equal to the spire ; 

 aperture acutely ovate; columella conspicuously intorted, 

 arcuated, and abruptly truncate; peristome acute, the mar- 

 gins united by a diffused callus. 



Syn. Achatinus, Montf. Cochlitoma, Ferns. Oncsea, 

 Gist. Archachatina, Aiders. 



Ex. A. panthera, Ferussac, pi. 73, fig. G. Shell, A. 

 zebra, Chemnitz, fig. G, a. 



The species of this genus, which comprises some of the 

 largest terrestrial Mollusks, live near water about trees; 

 they are chiefly African in their geographical distribution, 

 being represented in America by the groups of Corona 

 and Orthalicus. 



