. Elements of geology. Geology. Anodonta Cordierii; fossil. Paris. Anodonta latimargi- natus; recent. Bahia. Unio littoralis ; recent. Auvergne. Lamarck divided the bivalve mollusca into the Dimyary, or those having two large muscular impressions in each valve, as ah in the Cyclas, Fig. 23., and the Monomyary, such as the oys- Fig. 28. scallop, in which there is only one of these impressions, as is seen in Fig. 28. Now, as none of these last, or the unimus- cular bivalves, are freshwater, we may at once presume a deposit in which we find any of them to be marine. The univalve shells most chara
. Elements of geology. Geology. Anodonta Cordierii; fossil. Paris. Anodonta latimargi- natus; recent. Bahia. Unio littoralis ; recent. Auvergne. Lamarck divided the bivalve mollusca into the Dimyary, or those having two large muscular impressions in each valve, as ah in the Cyclas, Fig. 23., and the Monomyary, such as the oys- Fig. 28. scallop, in which there is only one of these impressions, as is seen in Fig. 28. Now, as none of these last, or the unimus- cular bivalves, are freshwater, we may at once presume a deposit in which we find any of them to be marine. The univalve shells most characteristio. of freshwater deposits are, Planorbis, Lim- nea, and Paludina. (See figures.) But to Ostrea vcsicuiaris {Gryphtea these are occasionally added Physa, Succi- giohosa. Sow.), chalk. ^^^^ Ancylus, Valvata, Melanopsis, Mela- nia, and Neritina. (See figures.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyell, Charles, Sir, 1797-1875; Gibbes, Lewis Reeve, 1810-1894, former owner. DSI; Merrill, George P. (George Perkins), 1854-1929, former owner. DSI. Philadelphia : James Kay, Jun. and Brother ; Pittsburgh : C. H. Kay & Co.
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