574 



MOLLUSCA 



PHYLLTM VI 



Äuricula Lani. 

 roimded anteriorly 

 times denticulated. 



Gassidula Fer, : 

 (Fig. 1080) ; Melampus Montf. 



Garychium Müller (Fig. 1081), 



(Fig. 1078). Elongate-oval, with epidermis. Aperture narrow, 

 Inner lip bearing two or tliree folds ; outer lip thickened, sonie- 

 Jura to Kecent. 

 Plecotrema Adams ; Alexia Leach (Fig. 1079); Pythio'psis Sandb. 



Shell small, smooth and glossy. Inner lip 



Fig. 1079. 



Fig. 107 



Äuricula dutemplei 



Deshayes. Lower Alexia pisoliim Desli. 



Eocene ; Sainceixx Miocene ; Pontlevoy, 



(after Deshayes). Touraine. ^/i. 



Fi(i. lOSl. 



Pythiopsis la- Carychium antiquum 



marcki (Desh.). A. Braun. Miocene; 



Eocene ; Houdan Hochheini, near May- 



(after Deshayes). euce. Enlarged. 



bearing one or two folds ; outer margin thickened, sometimes with a tooth. Jura to 

 Kecent. Terrestrial. 



Scarahus Montf. (Polyodonta Fischer von Waldh.) ; Leuconia Gray ; Blauneria 

 Shuttlewortb, etc. Tertiary and Eecent. 



Family 2. Chilinidae Dali. 



Shell oval, auriculate, with large aperture, the columellar marcjin 

 provided with spiral folds ; surface coloured in various patterns. 

 Tertiary and Recent. 



Ghilina Gray. This is said to be Streptoneurous. The 

 dentition resembles that of Physa. Miocene and Recent ; South 

 America. 



Family 3. Physidae Dali. 



Shell sinistral, oval, glossy, unicoloured. Aperture large; colu- 

 mella twisted or simple. Jura to Recent. 



Physa Drap. (Fig. 1082). Shell brilliantly polished, thin, 

 sinistral. Upper Jura to Recent. 



Fig. 1082. 



Physa gigantea 

 Michaud. Lower 

 Eocene ; Rilly, near 

 Rheims. 



Family 4. Lymnaeidae 

 Keferstein. 



Shell thin, turreted. or dis- 

 coidal. Fresh-water inhahitants. 

 Lias to Recent ; especially abun - 

 dant in the Tertiary. 



Lymnaea Lam. {Limnaeus 

 auct.) (Fig. 1083). Shell very 

 thin and corneous. Body whorl 

 very large ; spire acute, and 

 moderately high. Aperture wide, oval 

 to Recent ; maximum in Tertiary. 



Planorhis Guettard (Figs. 1084, 1085), 



Fig. 1083. 



Lymnaea pachygaster 

 Fresh - water 

 Miocene ; Mörsingen, 

 near Ulm. 



Thom. 



JlFiG. 1084. 



Planorhis cornu Brongt. var. mantelli 

 Dnnker. Upper Miocene; Mundingen, 

 Wiirtemberg. 



outer margin sharp. Upper Jura (Purbeck) 

 Discoidal (exceptionally turreted), with 



