SUB-OKI >KK I! 



BASOMMATOPHORA 



p..:', 



plication for the respiratory tube. Fouinl in brackish water, Congfri.m 

 of Hungary, Roumania, and South Russia. 



ll'illiamia, Monts. ; Gadinia, Gray. Recent and Pliocene. 



Amphibola, Schuni. Shell spirally globose, thick, rugose, and eip.-mil.-itr. 

 This is placed in a separate family, Amphibolidae. 



!{< -ni.- 



Sub-Order B. BASOMMATOPHORA. A. Schmidt. 



Shell invariably present. Eyes situated at the base of a pair of tentacles. A<jn<it\ 

 or living in the vicinity of water. 



FIG. 1029. 



Auricula Dutem 

 plei, Desh. Lower 

 Eocene ; Sainceux 

 (after Deshayes). 



Pythiopsis La- 

 Alexiapisoli?ia, Desh. marcki, Desh. sp. 

 Miocene ; Pontlevoy, Eocene ; Houdan 

 Touraine. 2/j. (after Deshayes). 



FIG. 1032. 



Carychium ant !<j H n m . 

 A. Braun. Mioct-nc : 

 Hochheim, near 

 Mayence. Enlarged. 



Family 1. Auriculidae. Blainvilh-. 



Shell thick, ovate. Spire short, body whorl very large. Inner lip or columella bear- 

 ing plications. Shore forms or inhabitants of salt marshes. Jura to Recent. 



Auricula, Lam. (Fig. 1029). Elongate-oval, with epidermis. Aperture narrow. 

 rounded an- 

 teriorly. Inner 

 lip bearing two 

 or three folds ; 

 outer lip thick- 

 ened, some- 

 times denticu- 

 lated. Jura to FlG 1029 PlG< 1031 

 Recent. *..~*~.- n,..,,, FIG. ioso. 



Cassidula, 

 Fer. ; Pleco- 

 trema, Adams ; 

 Alexia, Leach (Fig. 1030); Pythiopsis, Sandb. (Fig. 1031); Melampus, Montf. 



Carychium, Mull. (Fig. 1032). Shell small, smooth, and glossy. Inner lip 

 bearing one or two folds; outer margin thickened, sometimes with 

 a tooth. Jura to Recent. 



Scarabus, Montf. (Polyodonta, Fischer and Waldh.) ; Leuconia, 

 Gray ; Blauneria, Shuttleworth, etc. Tertiary and Recent. 



Family 2. Chilinidae. Dall. 



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

 provided with spiral folds; surface coloured in various patterns. 

 Tertiary and Recent. 



Chilina, Gray. This is said to be Streptoneurous. The denti- 

 tion resembles that of Physa. Miocene and Recent ; South 

 America. 



K;'n lily 3. Physidae. Dall. 



FIG. 1033. 



Physa gigantea, 

 Micliaud. Lower 

 Eocene; Hilly, near 

 Rheime. 



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

 columella twisted or simple. Jura to Recent. 



Physa, Drap. (Fig. 1033). Shell resembling Limnaea, but 

 sinistral. Upper Jura to Recent. 



Family 4. Limnaeidae. Keferstein. 



Shell thin, turreted, or discoidal. Fresh-water inhabitants. Lias to Recent ; especi- 

 ally abundant in the Tertiary. 



