. Narrative of an expedition to the source of St. Peter's river, Lake Winnepeek, Lake of the Woods, &c., performed in the year 1823, ... under the command of Stephen H. Long . e whorl norappressed to it, but merely in contact with it, the labrumnot diminished in thickness at the point of contact; urn-bilicus large, exhibiting the volutions. Breadth less than one-fifth of an inch. Inhabits North-west Territory. For this species I am indebted to Dr. Bigsby. It is verysimilar to the tricarinata, nobis, but is destitute of cari-nated lines, and the umbilicus is rather larger; it differsfrom the ob
. Narrative of an expedition to the source of St. Peter's river, Lake Winnepeek, Lake of the Woods, &c., performed in the year 1823, ... under the command of Stephen H. Long . e whorl norappressed to it, but merely in contact with it, the labrumnot diminished in thickness at the point of contact; urn-bilicus large, exhibiting the volutions. Breadth less than one-fifth of an inch. Inhabits North-west Territory. For this species I am indebted to Dr. Bigsby. It is verysimilar to the tricarinata, nobis, but is destitute of cari-nated lines, and the umbilicus is rather larger; it differsfrom the obtusa of Europe, also, in the much greater mag-nitude of the umbilicus. PL 15, fig. 11. PALUDINA. P. limosa^ nob. North-west Territory. AMPULARIA. A. depressa. Shell ventricose, subglobular, obsoletelybanded with obscure green; whorls four, slightly wrinkled;body whorl more prominent above, somewhat flattened to-wards the suture, of a pale olivaceous colour, which is al-most concealed by numerous, unequal, longitudinal andtransverse greenish and brownish lines; spire very muchdepressed: aperture suboval, within somewhat glaucous, ij r,r/iy//,r ■>-//>,iv;i.
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