179 



Achatina. Shell oval or oblong; aperture entire, longitudinal; the right 

 lip sharp, never reflected. Columella smooth, truncated at the base. 



A. perdix, 

 ' zebra, 

 ' immaculata, 

 ' purpurea, 

 ' acuta, 

 ' bicarinata, 



A. Mauritiana, 



' castanea, 

 ' ustulata, 

 ' vexillum, 

 ' virginea, 

 ' Priamus, 



A. glans, 

 ' Peruviana, 

 ' albo-lineata, 

 ' fusco-lineata, 

 ' fulminea, 



A. columnaria, 

 ' folliculus, 

 ' acicula, 

 ' oleacea, (n. s.) 

 ' Marminii, (n. s. 



Succinea. Shell oval or ovate conical; aperture large, entire, longitu- 

 dinal; the right lip sharp, not reflected, united at the lower part to a smooth, 

 sharp, attenuated columella. No operculum. 



S. cuculata, S. oblonga, S. patula, S. rubescens, (n. s.) 



' amphibia, 



Auricula. Shell suboval or ovate oblong; aperture longitudinal, very 

 entire at the base, contracted at the upper part, where the margins are dis- 

 united. Columella with one or more plaits; the lip or margin sometimes re- 

 flected outwards, sometimes simple and sharp. 



