140 LIMNJEALiE. 



PIIYSA. DRAPAHNAUn. 



Shell thin, spiral, ovate, oblong, subglobose, sinistral, 

 smooth, polished ; mouth with the base entire, the colu- 

 mella more or less contorted. 



Animal with two long subulate or setaceous tentacula ; 

 eyes at their inner bases. Foot lanceolate. 



The British species of this genus have been referred to 

 two genera, Ph^sa and Aplexus. The animal of the former 

 has a dilated mantle with lobed edges ; that of the latter 

 has a simple mantle. We believe these to be specific, or 

 at best sectional distinctions ; they should at least be re- 

 garded as such until the characters of the animal in the 

 majority of exotic species have been carefully examined. 

 The genus Physopsls differs from Pliym as AcJiatlna dif- 

 fers from Pidimus, having the base of the columella trun- 

 cated. Tt is South African : there are no European 

 species. Fossil Physa;, closely resembling existing forms, 

 are common in the Purbeck strata in Dorsetshire. 



P. FONTiNAi.is, Linnaius. 

 Oval : spire very short and obtuse. 



Plate CXXII. fig. 8, 9. 



liullufontinuHs, LiNN. Syst. Nat. ed. 12, p. 1185. — Pult. Hutcliins, Hist. 



Dorset, p. 40.— Mont. Test. Brit. vol. i. p. 226; Suppl. p. M. 



— Maton and Rack. Trans. Linn. Soc. vol. viii. p. 12G. — 



Rack. Dorset Catal. p. 43, pi. 21, f. fi. — Tuar. Conch. 



Diction, p. 2(j. — Dillw. Recent Shells, vol. i. p. 487. — 



Wood, Index Testae, pi. 18, f. 37. 

 Turbo (Klvcrsus, Da Costa, Brit. Conch, p. 96, pi. .5, f. 6. 

 Planorhis bulla, Miji-LER, Verm. Hist. vol. ii. p. 167. 

 Bulinus perla, Muli.er, Natmforsch. 1781, vol. xv. p. 6, pi. 1. 

 Physafontinalis, Drap. Moll. Tor. et Fluv. France, p. 54, pi.,"?, f. 8, .9. — 



Fi.KiMiNfi, Brit. Animals, p. 276. — Ti-rt. Manual L. and 



