GASTEROPODA. 
BuGEsIA, Paladilhe, 1866. 
Shell resembling somewhat a very small Cerithiwm or micro- 
scopic Lithasia, but differing generically in having a wide, 
compressed, not callous columella like that of Lacuna. 
Distribution, B. Bourguignati. In washings of the River Lez, 
Montpellier. 
ANCULOSA, Say, 1821. 
Synonyms, Leptoxis, Rafinesque; Anculotus auctores. 
Type, A. preemorsus. 
Shell oval; aperture entire and rounded in front; columella 
callously thickened above. 
Distribution, 31 species. North America. 
MELANOPSIS, including Pirena, see p. 248, W. M., ui. 
Famity VII.—PALUDINIDzA.* 
The genera contained in this family are— 
PALUDINA, AMPULLARIA (Pomus, Marisa, Asolene), LANISTES, 
MELADOMUS, BITHINIA, with the following sub-genera of the 
last :— 
Stenothyra (Nematura), Hydrobia, Syncera, Paludinella, Lit- 
torinella, Amnicola, and 
MoItesstERiA, Bourguignat, 1863. 
Type, Paludina Simoniana, Charpentier. 
Shell somewhat similar to that of Acme; test pitted; de- 
pressions octagonal, tetragonal, and rounded according to their 
position; peristome externally thickened; no operculum has 
been observed. 
Distribution, 1 species. Saline springs at Fouradade (Py- 
renees). 
Fossil, 3 species. Alluvyium of the river Garonne, at Toulouse. 
PoMAtTiopsis, Tyron, 1865. 
Synonym, Chilocylus, Guill. 
Shell elongated ; margin of aperture slightly expanded ; oper- 
culum corneous, subspiral, without an internal process. 
Animal like that of Hydrobia, but the foot is furnished with 
lateral sinuses ; terrestrial or amphibious. 
Distribution, species. America. 
® See p. 257, &e, 
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