. Cincinnati quarterly journal of science. Science; Science -- Ohio. Fig. 21—Cycloconcha Fig. 22—Hinge line and interior of riglit valve. Shell equivalve, slightly inequilateral, subcircular in outline, sur- face smooth, with the exception of fine concentric lines of growth, beaks projecting slightly beyond the hinge line, but not incurved. Hinge line having one small cardinal tooth beneath the beak, deeply bifid, and one lateral tooth on each side of about equal length. The cardinal tooth is somewhat trigonal, slightly arcuate on the posterior side and prolonged posteriorly,
. Cincinnati quarterly journal of science. Science; Science -- Ohio. Fig. 21—Cycloconcha Fig. 22—Hinge line and interior of riglit valve. Shell equivalve, slightly inequilateral, subcircular in outline, sur- face smooth, with the exception of fine concentric lines of growth, beaks projecting slightly beyond the hinge line, but not incurved. Hinge line having one small cardinal tooth beneath the beak, deeply bifid, and one lateral tooth on each side of about equal length. The cardinal tooth is somewhat trigonal, slightly arcuate on the posterior side and prolonged posteriorly, Pallial line is not distinct in the spe- cimen examined, nor are the muscular impressions, though one may be doubtfully traced at the anterior end of the anterior lateral tooth. Greatest length of specimen, 36-60 inch; greatest breadth, 28'60 inch. Tlie general form of this shell has a striking resemblance to the modern Cyelas. Found back of Newport, Kentucky, at an elevation of about 150 feet above low water-mark, and at the excavation for Columbia avenue, in Cincinnati, at about the same elevation. As I only know of two specimens having been found, and one of them a valve, both of which I found myself, I am compelled at present to mark the species rare. Range 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 Cincinnati, S. A. Miller
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Keywords: ., bookcentury1800, bookcollecti, bookdecade1870, booksubjectscience
