The Fossils And Palontological Affinities of the Neocomian Deposits of Upware
The Fossils And Palontological Affinities of the Neocomian Deposits of Upware
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N. Europe. Hils formation, Schb'ppenstedt.
S. Europe. France and Switzerland.
Ostrea frons, Parkinson, var. Carinata, Sowerby, Min. Con. , pi. 365.
Occurs at Brickhill, Atherfield, etc.
OSTREA WALKERI, n. Sp. (Plate IV. , fig. 4, a, 6. ) A variable oyster shell one of the Rudes, plano-convex or con- cavo-convex, covered with rude, imbricating growth-lamellae : the shells are moderately thick. It is attached sometimes by the whole surface of the lower valve but in other specimens by only a very ...small area ; the lower valve in the former case has a thickened margin. Contour ovate more or less irregular, beak pointed.
Lower valve moderately deep, chamoid, or shallow. Upper valve flat or concave, and irregular with concentric growth striae or imbrications, which are usually less prominent than on the lower valve.
Ligament area large and triangular (about th length of the whole shell), its base usually broadest. A median gutter serves to divide it into three sub-equal parts; in the upper valve the liga- ment area is much smaller.
What to read after The Fossils And Palontological Affinities of the Neocomian Deposits of Upware?
You can find similar books in the "Read Also" column, or choose other free books by Walter Keeping to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
N. Europe. Hils formation, Schb'ppenstedt.
S. Europe. France and Switzerland.
Ostrea frons, Parkinson, var. Carinata, Sowerby, Min. Con. , pi. 365.
Occurs at Brickhill, Atherfield, etc.
OSTREA WALKERI, n. Sp. (Plate IV. , fig. 4, a, 6. ) A variable oyster shell one of the Rudes, plano-convex or con- cavo-convex, covered with rude, imbricating growth-lamellae : the shells are moderately thick. It is attached sometimes by the whole surface of the lower valve but in other specimens by only a very ...small area ; the lower valve in the former case has a thickened margin. Contour ovate more or less irregular, beak pointed.
Lower valve moderately deep, chamoid, or shallow. Upper valve flat or concave, and irregular with concentric growth striae or imbrications, which are usually less prominent than on the lower valve.
Ligament area large and triangular (about th length of the whole shell), its base usually broadest. A median gutter serves to divide it into three sub-equal parts; in the upper valve the liga- ment area is much smaller.
What to read after The Fossils And Palontological Affinities of the Neocomian Deposits of Upware?
You can find similar books in the "Read Also" column, or choose other free books by Walter Keeping to read onlineMoreLess
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