SUB-ORDER B BASOMMATOPHORA 493 
plication for the respiratory tube. Found in brackish water, Congerian Stage (Pliocene), 
of Hungary, Roumania, and South Russia. 
Williamia, Monts.; Gadinia, Gray. Recent and Pliocene. 
Amphibola, Schum. Shell spirally globose, thick, rugose, and operculate. Recent. 
This is placed in a separate family, Amphibolidae. 
Sub-Order B. BASOMMATOPHORA. A. Schmidt. 
Shell invariably present. Hyes situated at the base of a pair of tentacles. Aquatic, 
or living in the vicinity of water. 
Family 1. Auriculidae. Blainville. 
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 Fic. 1029. Fic. 1031. Fic. 1032. 
Recent. Auricula Dutem Fie. 1030. Pythiopsis La-  Carychiumantiquum, 
Cassidu la, plei, Desh. Lower Alewxiapisolina, Desh. marcki, Desh. sp. A. Braun. Miocene ; 
Eocene; Sainceux Miocene; Pontlevoy, Eocene; Houdan Hochheim, near 
Fer. ; Pleco- (after Deshayes). Touraine. 2/3. (after Deshayes). Mayence. Enlarged. 
trema, Adains ; ~ 
Alewia, Leach (Fig. 1030); Pythiopsis, Sandb. (Fig. 1031); Melampus, Montt. 
Carychium, Mill. (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.); Lewconia, 
Gray ; Blawneria, Shuttleworth, etc. Tertiary and Recent. 

Family 2. Chilinidae. Dall. 
Shell oval, auriculate, with large aperture, the columellar margin 
provided with spiral folds; surface colowred 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. 
Family 3. Physidae. Dall. 

Fic. 1033. Shell sinistral, oval, glossy, wnicoloured. Aperture large ; 
Physa gigantea, columella twisted or simple. Jura to Recent. 
Michaud. — Lower 
Hocene; Hilly, near Physa, Drap. (Fig. 1033). Shell resembling Limnaea, but 
Rheims. SONY 5 te) ’ 
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. 
