530 Rev. L. Guilding on the Zoolog}/ of 



Testa solida, pallida, iinniaculata, globosa ; labro marginato 

 crasso ; columella efFusa. 



Habitat gregatim, varietate innumera, sub lapidibus Barba- 

 densibus. 



Var. /3. flavida, immaculata. 



Var. y. rufo superne undulata. 



Var. t. rufo maculata, nebulosa. 



Var. E. fascia maculari. 



Var. ^. utrinque castaneo late fasciata. 



Var. «. superne rufescente-flavescensj apertura crocea. 



Had I not collected an immense number of the Helicina alive, 

 I should have been led perhaps to describe the shells as belong- 

 ing to numerous species. It is almost impossible out of hundreds 

 to find two individuals perfectly alike. The fasciated variety is 

 the rarest and most interesting. The animal is occasionally pale. 

 It creeps fast, bending its tentacula with a quick and constant 

 motion to examine its path ; while the Heliciform genera carry 

 their superior tentacula generally erect and steady, using the 

 inferior ones and the brachiform expansions of the cheeks prin- 

 cipally as their organs of touch. 



Genus. AcHATiNA. Auctorum. 



Char. Gen. 



Animal heliciforme, terrestre, hermaphroditum. Corpus valde 

 corrugatura. Tentacula quatuor, duo superiora longiora, capitulis 

 oculigeris. Os subtus, labiis plicatis: genis rotundatis amplis. 

 Lingua magna, carnosa. Mandibula cornea, ossiculis dentiformi- 

 bus. Penis ad radices tentaculi dextri. Pes raaximus, crassus. 

 Operculum nullum. Pallium amplum, lobus superior supra peri- 

 trema vix reflexum, lobus inferior (Collare) bipartitus, cervicem 

 tegens, foramine perforatum. 



