PULMONATA BASOMMATOPHORA 



439 



Fig. 292. — Examples of the Auriculidae: 

 A, Auricula Judae Lam., Borueo ; B, 

 Scarabus Lessoni Blainv., E. Indies ; 

 C, Cassidula mustelina Desh., N. 

 Zealand ; D, Melampus castaneus 

 Miihlf., S. Pacific ; E, Pedijjes quad- 

 ridens Pfr., Jamaica. 



Fam. 1. Auriculidae. — Breathing organ a pulmonary sac or 



true lung ; shell spiral, conoidal, internal partitions usually 



absorbed, aperture more or less 



strong!}^ toothed. Jurassic . 



Genera : Auricuhi, Carychium, 



Scarabus, Alexia, Tralia, Pleco- 



trema, Cassidida, Melam2nis, Leu- 



conia, Fedii^es (Fig. 292). 



Fam. 2. Otinidae. — Shell auri- 

 form, spire very short. Genera : 



Otina, Cam^tonyx. — Eecent only. 

 Fam. 3. AmpJiiholidae. — A 



pulmonary sac on right side of 



neck, eyes almost pedunculate, 



shell turbinate, rudely sculptured, 



operculate. — Eecent. Genus, 



Amphilola (Fig. 293) ; subg. 



Ampullarina. 



Fam. 4. Limnaeidac. — Pul- 

 monary sac protected by an external lobe ; shell variable, fragile. 



Jurassic (i.) Ancylinae, shell more or less limpet-shaped. 



Genera: Aiwylus, Gundlachia, Latia. (ii.) Limnaeinae, shell spiral. 



Genera: Limnaea, Ampliipeplea, Erinna, Lantzia, Pompholyx, Choa- 



nomphalus (with Garinifex). (iii.) Flanorhinae, shell sinistral, spire 



flattened or elevated. Genera : Phmorhis, Isidora ( = Bidimis). 

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

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

 tral, lustrous. Jurassic . Genera: PJiysa, 



A2)hcta. 



Fam. 6. Chilinidac — Lobe of pulmonary 

 sac large, tentacles broad ; shell ventricose, 

 rather solid ; columella plicate. Miocene . 



Fig. 2m-Amphiboia Single genus, Chilina. 



avellana Cuern. o o 



Sub- order II. Stylommatophora. — Two 



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

 the upper pair, male and female orifices united (except in Vaginu- 

 lidae and Onchidiidae), no distinct osphradium. 



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

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

 to this group), rachda witli usually few, large, sickle-shaped 



