. Annual report. New York State Museum; Science; Science. Pteronitella peninsulae anterior and posterior cardinal angles the lateral margins depart at almost 90 degrees. The beak is very near the anterior extremity and the shell is quite convex along the oblique and somewhat curved crescence line, from which the anterior slope is abrupt and the posterior abrupt and slightly concave at first becoming flat at the hinge. The anterior scar is small and deep, the posterior large and faint. Beneath the beak are three or four teeth diverging from the edge of the ligament area. Lower Devonic. Presque
. Annual report. New York State Museum; Science; Science. Pteronitella peninsulae anterior and posterior cardinal angles the lateral margins depart at almost 90 degrees. The beak is very near the anterior extremity and the shell is quite convex along the oblique and somewhat curved crescence line, from which the anterior slope is abrupt and the posterior abrupt and slightly concave at first becoming flat at the hinge. The anterior scar is small and deep, the posterior large and faint. Beneath the beak are three or four teeth diverging from the edge of the ligament area. Lower Devonic. Presque Isle stream, Chapman Plantation, Me. Myalina pterinaeoides nov. One of the commoner species at Presque Isle stream is a Myalina with a striking resemblance throughout, save in the character of the hinge, to certain Pterineas with curtailed posterior wing, and specially similar to Pt. f o 11 m a n n i The frequent internal casts show the species to be devoid of the hinge teeth of Pterinea and present only the moderately broad ligamental striations of Myalina and the abbreviated earless and abrupt front margin. This latter feature is rather feebly de- veloped but when the shell is retained • the anterior incurvature xFrech. op. cit. pi. 10, fig. 5: Drevermann. Fauna d. Untercoblenzsch, p. 82, pi. 10, fig. it 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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