Fig. 292.—Examples of the Auriculidae: A, Auricula Judae Lam., Borneo; B, Scarabus Lessoni Blainv., E. Indies; C, Cassidula mustelina Desh., N. Zealand; D, Melampus castaneus Mühlf., S. Pacific; E, Pedipes quadridens Pfr., Jamaica.
Fam. 2. Otinidae.—Shell auriform, spire very short. Genera: Otina, Camptonyx.—Recent only.
Fam. 3. Amphibolidae.—A pulmonary sac on right side of neck, eyes almost pedunculate, shell turbinate, rudely sculptured, operculate.—Recent. Genus, Amphibola (Fig. [293]); subg. Ampullarina.
Fam. 4. Limnaeidae.—Pulmonary sac protected by an external lobe; shell variable, fragile. Jurassic——. (i.) Ancylinae, shell more or less limpet-shaped. Genera: Ancylus, Gundlachia, Latia. (ii.) Limnaeinae, shell spiral. Genera: Limnaea, Amphipeplea, Erinna, Lantzia, Pompholyx, Choanomphalus (with Carinifex). (iii.) Planorbinae, shell sinistral, spire flattened or elevated. Genera: Planorbis, Isidora (= Bulinus).
Fam. 5. Physidae.—Mantle more or less reflected over the shell (radula, Fig. [141]C, p. 235); shell sinistral, lustrous. Jurassic——. Genera: Physa, Aplecta.
Fig. 293.—Amphibola avellana Chem.
Fam. 6. Chilinidae.—Lobe of pulmonary sac large, tentacles broad; shell ventricose, rather solid; columella plicate. Miocene——. Single genus, Chilina.
Sub-order II. Stylommatophora.—Two pairs of retractile tentacles (except in Janella), eyes at the tip of the upper pair, male and female orifices united (except in Vaginulidae and Onchidiidae), no distinct osphradium.