. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 267 to margin and number from 16 or less in small individuals to 26 in the largest shells seen. In full growth of the shell the median rib becomes more pronounced than the rest on the anterior margin and thus makes a low median angle at this margin. Extremely fine concentric lines are visible under favorable preservation. The cardinal area is narrow and only in rare instances are spines re- tained or developed at the cardinal extremities. On the interior the brachial valve has a small erect V-shaped cardinal process and shor
. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 267 to margin and number from 16 or less in small individuals to 26 in the largest shells seen. In full growth of the shell the median rib becomes more pronounced than the rest on the anterior margin and thus makes a low median angle at this margin. Extremely fine concentric lines are visible under favorable preservation. The cardinal area is narrow and only in rare instances are spines re- tained or developed at the cardinal extremities. On the interior the brachial valve has a small erect V-shaped cardinal process and short thin outer socket walls. On each of the simple coarse ribs which correspond to the furrows of the exterior is a single row of sharp pustules the median row being the most depressed, and the two adjoining the most prominent. No trace of reniform or other lateral depressions is evident. In all such small and coarse ribbed species represented by C. billings i, C. laticosta Hall and. 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
