XV 



PULMONATA — BASOMMATOPHORA 



439 



Fam. 1. AiiricuUdae. — Breathing organ a pulmonary sac 

 or true lung ; shell spiral, conoidal, internal partitions usually 

 absorbed, aperture more or less 

 strongly toothed. Jurassic . 



Fig. 292. — Examples of the Avriculidae : 

 A, Auricula Judae Lam., Borneo; B, 

 Scarabus Lessoni Blaiuv., E. Indies; 

 C, Cassidula mustelina Desh., N. Zea- 

 land; D, Melampus castaneas Miihlf., 

 S. Pacific ; E, Pedipes quadridens Pfr., 

 Jamaica. 



Genera; Auricula^ CarycMum^ 

 Scarabus^ Alexia, Tralia, Pleco- 

 trema, Cassidula, Melampus, 

 Leucoiiia, Pedipes (Fig. 292). 

 Fam. 2. Otinidae. — Shell 

 auriform, spire very short. 

 Genera: Otina, Camptonyx. — 

 Recent only. 



Fam. 3. Amphiholidae. — A 

 pulmonary sac on right side of 

 neck, eyes almost pedunculate, 

 shell turbinate, rudely sculpt- 

 ured, operculate. — Recent. 

 Genus, Amphihola (Fig. 293) ; 

 subg. Ampullar ina. 



Fam. 4. Limnaeidae. — Pulmonary sac protected by an exter- 

 nal lobe ; shell variable, fragile. Jurassic . (i.} Anci/Unae, 



shell more or less limj^et-shaped. Genera: Ayicijlus, Gundlaclila, 

 Latia. (ii.) Limnaeiiiae, shell spiral." Genera: Limnaea, AnipM- 

 peplea, Erinna, Lantzia, Pompliolyx^ Choanomphalus (with 

 Carinifex). (iii.) Planorhinae, shell sinistral, spire flattened or 

 elevated. Genera: Planorhis, Isidora (^ = Buliniis}. 



Fam. 5. Physidae. — Mantle more or less reflected over the 

 shell (radula. Fig. 141c, p. 235) ; shell sinis- 

 tral, lustrous. Jurassic . Genera: P/i^srt, 



Aplecta. 



Fam. 6. Chilinidae. — Lobe of pulmonary 

 sac large, tentacles broad ; shell ventricose, 



rather solid ; col umella plicate. Miocene . 



YiG.iQ?,.— Amphihola Single gcnus, Chilina. 



aveiiana Chem. Sub-order II. Stylommatophora. - Two 



pairs of retractile tentacles (except in JanelUi), eyes at the tip 

 of the upper pair, male and female oriflces united (except in 

 Vaginulidae and Onchidiidae), no distinct osphradium. 



Fam. 1. Testacellidae. — Animal carnivorous, slug-like or 

 spirally coiled, no jaw (whence the name Ag7iatha, often given 



