Enumeration of Fossils Collected in Niagara Limestone At Chicago Illinois Wit
Enumeration of Fossils Collected in Niagara Limestone At Chicago Illinois Wit
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Sp. "New Paleozoic Fossils, " p. 88. Very abundant in casts, often with the two valves united. Exterior seldom seen. This species possessed a very wide cartilage facet which is rarely seen.
CLIDOPHORUS Conrad.
Clidophorus m'chesneyanus W. And M.
Plate III. Figure 3.
Shell equivalve, with the general aspect of an Orthonota ; but very slightly widening pos- teriorly ; posterior end symmetrically truncate-rounded above and below, so that the most projecting extremity is on the line midway between ...the dorsal and ventral sides. The dor- sal side is erect, compressed, and the hinge-line is three fourths as long as the shell. The anterior margin is rounded. The beak is very near the anterior end and projects slightly above the hinge. Shell rather ventricose the umbonal ridge lying above the middle and vanishing in the direction of the posterior extremity. The casts prove the existence of deep pyriform pits for the anterior adductors, which are bounded posteriorly by an ele- vated margin scarcely possessing the characters of the "clavicular ridge" of Clidophorus.
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To quickly assess the difficulty of the text, read a short excerpt:
Sp. "New Paleozoic Fossils, " p. 88. Very abundant in casts, often with the two valves united. Exterior seldom seen. This species possessed a very wide cartilage facet which is rarely seen.
CLIDOPHORUS Conrad.
Clidophorus m'chesneyanus W. And M.
Plate III. Figure 3.
Shell equivalve, with the general aspect of an Orthonota ; but very slightly widening pos- teriorly ; posterior end symmetrically truncate-rounded above and below, so that the most projecting extremity is on the line midway between ...the dorsal and ventral sides. The dor- sal side is erect, compressed, and the hinge-line is three fourths as long as the shell. The anterior margin is rounded. The beak is very near the anterior end and projects slightly above the hinge. Shell rather ventricose the umbonal ridge lying above the middle and vanishing in the direction of the posterior extremity. The casts prove the existence of deep pyriform pits for the anterior adductors, which are bounded posteriorly by an ele- vated margin scarcely possessing the characters of the "clavicular ridge" of Clidophorus.
What to read after Enumeration of Fossils Collected in Niagara Limestone At Chicago Illinois Wit?
You can find similar books in the "Read Also" column, or choose other free books by Winchell, Alexander, 1824-1891 to read onlineMoreLess
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