. Annual report. New York State Museum; Science; Science. 276 NEW YORK STATE MUSEUM in final stages. The hinge line is straight and the cardinal angles very slightly extended, subangular or even rounded; cardinal area narrow, not striated vertically, denticulate but slightly and only near the delthyrium of the ventral valve. The opposite valve receives this denticulate edge in a narrow crenulated groove. The muscle scar of the ventral valve is short and broadly flabellate with somewhat thickened and elevated margins. The deltidium is- usually but partially developed. In the brachial valve the
. Annual report. New York State Museum; Science; Science. 276 NEW YORK STATE MUSEUM in final stages. The hinge line is straight and the cardinal angles very slightly extended, subangular or even rounded; cardinal area narrow, not striated vertically, denticulate but slightly and only near the delthyrium of the ventral valve. The opposite valve receives this denticulate edge in a narrow crenulated groove. The muscle scar of the ventral valve is short and broadly flabellate with somewhat thickened and elevated margins. The deltidium is- usually but partially developed. In the brachial valve the cardinal process is strongly bifid, the separate parts being widely separated; dental sockets shallow. The surface of the valves is marked in the umbonal region by 16 to 20 sharp angular plications, simple throughout the normal contour of the valves. These primary plications with those of the secondare series eventuallv constitute over the bodv of the. 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. Albany : University of the State of New York
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
