. Annual report. New York State Museum; Science; Science. 204 NEW YORK STATE MUSEUM anterior ear smooth, but on the posterior slope they are continued to the hinge. The posterior wing is cancellated and the cardinal line more strongly striate. The left valve which is less convex than the other has the radial riblets developed only on the median area, both anterior and posterior wings being smooth save on the. i Pterinea edmundi posterior hinge where is a cancellated group of three or four strong radii. The variations in the outline of this species reach an extreme in the variety subrecta, whic
. Annual report. New York State Museum; Science; Science. 204 NEW YORK STATE MUSEUM anterior ear smooth, but on the posterior slope they are continued to the hinge. The posterior wing is cancellated and the cardinal line more strongly striate. The left valve which is less convex than the other has the radial riblets developed only on the median area, both anterior and posterior wings being smooth save on the. i Pterinea edmundi posterior hinge where is a cancellated group of three or four strong radii. The variations in the outline of this species reach an extreme in the variety subrecta, which retains the same style of orna- ment as the foregoing and relative proportions and development of the parts, but is quite erect. This appears to be a persistent feature which we find exemplified in several examples. Lower Devonic. Edmunds Hill, Chapman Plantation, Me. Pterinea cf. fasciculata Goldfuss Pterinea fasciculata Goldfuss. Petrefacta Germaniae, 2 :i37, pi. 129, fig. 5 Pterinea fasciculata Freeh. Devon. Aviculiden Deutschlands 1891. p. 84, pi. 8, fig. 1; pi. 9, fig. 1-3 This species is radially and coarsely ribbed, quite convex and •oblique along the crescence line, the anterior wing strongly. 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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