. Bulletin - New York State Museum. Science. 276 NEW YORK STATE MUSEUM in final stages. The hinge hne 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 proce
. Bulletin - New York State Museum. Science. 276 NEW YORK STATE MUSEUM in final stages. The hinge hne 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 b)"" 16 to 20 sharp angular plications, simple throughout the normal contour of the valves. These primary plications with those of the secondary series eventually constitute over the body 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; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
