. Bulletin - New York State Museum. Science. 184 NEW YORK STATE MUSEUM Platyceras lejeunii nov. Shell of medium size with relatively small coil and rapidly ex- panding suberect body whorl. Surface with subspiral or some- what twisted longitudinal ridges crossing and festooning irregular. Platyceras lejeunii concentric growth lines. The surface is covered with very long and slender spines which are curved or arched backward. The shell is more slender than other echinate species and the spines relatively longer and more arched. Lower Devonic. Grande Greve, P. Q. Platyceras (Orthonychia) belli no
. Bulletin - New York State Museum. Science. 184 NEW YORK STATE MUSEUM Platyceras lejeunii nov. Shell of medium size with relatively small coil and rapidly ex- panding suberect body whorl. Surface with subspiral or some- what twisted longitudinal ridges crossing and festooning irregular. Platyceras lejeunii concentric growth lines. The surface is covered with very long and slender spines which are curved or arched backward. The shell is more slender than other echinate species and the spines relatively longer and more arched. Lower Devonic. Grande Greve, P. Q. Platyceras (Orthonychia) belli nov. Shell erect, minutely arched and incurved at the apex, expand- ing very gradually but equally for nearly one half its length and thence more abruptly, the cross-section of the whorls being es-. 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
