PULMONATA STYLOMMATOPHORA 



443 



columella strongly truncate), witli the sub-genera Perideris, 

 Limicolaria, Columna, Pscudachatina, Homorus, probably belongs 

 to a distinct family. 



Fam. 11. Achat incUidac. — Eadula, p. 234; shell small, buli- 

 moid, indifferently dextral or sinistral. Genera : Achatinella 

 (subg. Auriculella, Amastra, Carclia), Tornatellina. 



Fam. 12. Succincidac. — Eadula, p. 234; lower pair of ten- 

 tacles wanting or small ; shell internal or external, thin, spiral 



or not, last whorl large. Eocene— . 



Genera : Succinea, Homalonyx, Hyalimax, 

 (?) Litliotis, (?) Catinella. 



Fam. 13. Jandlidae. — Eadula, p. 234 ; 

 animal slug-like, no lower tentacles, shell 

 an internal plate. KSingle genvis, Janella 

 ( = AthoracojjJiorus), with sul)g. Aneitea. 



Fam. 14. Vagimdidae. — Eadula, p. 

 234; animal slug-like, covered with a 

 coriaceous mantle, lower tentacles bifid, 

 genital orifices widely separated, male 

 behind the lower right tentacle, female 

 on inferior median part of right side, 

 anus and pulmonary orifice nearly terminal; 

 shell absent. Single genus, Vayinida 

 ( = Vcroniccllci). 



Fa^l 15. OncJiidiidac. — Body oval, mantle thick, often warty, 

 sometimes set with "eyes" (p. 187), two tentacles, genital orifices 

 widely separate, anus and pulmonary orifice as in Vaginula ; no 

 shell. Genera : Pcronia, Onchidium, OncJiidiella. The family 

 appears to be an instance of Pulmonata reverting to marine 

 habits of life. 



Fig. 298. — Achatina zebra 

 Lam., S. Africa. x^. 



