with a revision of thè Limnmdce of Authors. 
357 
Family CHILII7IDJE. . Dall. 
Tentaeles flattened. Mantle witli a rhombiform lobe cover- 
ing thè opening of thè pulmonic chamber. Shell dextral, 
columella plicate. Genitalia on thè right side. Faterai teeth 
nniformly comb-like, with thè bases prolonged before thè inser- 
tion of thè cusps. ISTo accessory siinple teeth. No jaw. Cen- 
tral tooth as in Physa. 
Genus Chilina. Gray. 18d0. 
Type C. fluctuosa. 
Sub-genus Chilina. 
Shell with a short blimt spire, smooth epidermis, iisually 
marked with bands of color and of more or less solid structure. 
Type Chilina ampullacea. Sby. 
Sub-genus Pseudochilina. Dall. 
Shell thin, covered with a rough fibrous epidermis ; spire 
elev^ated, acute. 
T}"pe Pseudochilina liinnceformis n. s. 
Testa acuto-coniGa^ suhtenuis / sj>ira elevata^ ad, ajyicem acu- 
minata ^ suturis subimp7'essis, anfr.VI. ; apertura elongata ; 
labro acuto / columella lata, plica valde munita, dente incon- 
spicuo ai'rnata epidermide a, spera, semifibrosa, fusca. 
Fon. 0.67, lat. 0.35. in. Dell. 58°. , 
Smithsonian Cabinet No. 5,908. Chili. Commodore Aulick, 
coll. 
The curious epidermis and broad plicate columella alone 
distinguisi! this singular shell from a LiimicBa. 
NOTES. 
The figures given by H. & A. Adams, of Aonphipeplea are 
not good. Those of Moquin Tandon are much better. 
Most of thè figures of dentition of thè fresh-water species 
given by Binney in thè Fand and Fr. Water Shells of N. Am. 
Part*il., are far from good. 
Some authors state that thè luterai jaws of Ancylus are not 
continuous with thè buccal piate. I bave followed Moquin 
