XV 



PULMONATA — STYLOMMATOPHORA 



443 



cose, columella strongly truncate), with the suh-geueYH Perideris, 

 Ziimicolaria^ Colwnina^ Pseudachatina^ ITomorus, probably belongs 

 to a distinct family. 



Fam. 11. Achat inelUdae. — Raclula, p. 234; shell small, buli- 

 moid, indifferently dextral or sinistral. Genera: Achatiyiella 

 (subg. Aiiriculella^ Amastra^ Carelia)^ Tornatellina. 



Fam. 12. Succineldae. — Radula, p. 234; lower pair of ten- 

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



or not, last whorl large. Eocene . 



Genera : Siiccmea^ Homcdonyx^ Hyalimax^ 

 (?) Lithotis^ (?) Cati7ieUa. 



Fam. 13. JanelUdae. — Radula, p. 234; 

 animal slug-like, no lower tentacles, shell 

 an internal plate. Single genus, Janella 

 (^ = Athoracopliorus)^ with subg. Aneitea. 



Fam. 14. Vaginulidae. — Radula, 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, Vaginula 

 (= Veronicella) . 



Fam. 15. Onchidiidae. — 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 : Peronia^ Onchidiumy Onelii- 

 diella. The family appears to be an instance of Pulmonata 

 reverting to marine habits of life. 



Fig. 298. — Achatina zebra 

 Lam., S. Africa, x ^ 



