PULMONATA — STYLOMMATOPHORA 



443 



cose, columella strongly truncate), with the sub-genera PeWc^ens, 

 Limicolaria^ Columna^ Pseudachatina^ Homorus^ probably belongs 

 to a distinct family. 



Fam. 11. Aehatinellidae. — Radula, p. 234; shell small, buli- 

 moid, indifferently dextral or sinistral. Genera: Achatinella 

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



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

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



or not, last whorl large. Eocene . 



Genera : Succinea^ Somalonyx^ Hyalimax^ 

 (?) Lithotis^ (?) Catinella. 



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

 animal slug4ike, no lower tentacles, shell 

 an internal plate. Single genus, Janella 

 (^ = Athoraeophorus)^ with subg. Aneitea. 



Fam. 14. Vaginulidae. — Radula, p. 

 234; animal slug4ike, 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. Onchidudae. — 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, Onchidium, Onchi- 

 diella. The family appears to be an instance of Pulmonata 

 reverting to marine habits of life. 



Fig. 2^%. — Achatina zebra 

 Lam., S. Africa, x \. 



