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Now, as none of these last, or the unimuscular bivalves, are fresh-water, we may at once presume a deposit containing any of them to be marine. Planorbis euomphalus, Sowerby; fossil. Limnaea longiscala, Brongniart; fossil. Paludina lenta, Brand.; fossil. Succinea amphibia, Drap. Valvata piscinalis, Mull.; fossil. Physa hypnorum, Linne; recent. Auricula; recent. Melania inquinata, Def.
In these layers, which abut against the granite, a mixture of mica and of unrounded grains of quartz and felspar occur, evidently derived from the disintegration of the crystalline rock, which must have decomposed in the atmosphere before the mud had reached this height. Entire shells of Helix, Pupa, and Succinea, of the usual living species, are embedded in the granitic mixture.
In the pools of water I found but a few aquatic beetles, and not any fresh-water shells: Succinea at first appears an exception; but here it must be called a terrestrial shell, for it lives on the damp herbage far from the water. Land-shells could be procured only in the same alpine situations with the beetles.
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