. Annual report. New York State Museum; Science; Science. SOME NEW DEVONIC FOSSILS 203. The umbonal teeth are strongly developed in the left valve as a set of three oblique ridges, behind them being a strong oblique ridge. What may prove to be the right valve of the species has a more convex surface, strong anterior muscle scar and teeth to cor- respond with the sockets of the other valve. This species is like but much more oblique than the P. foil- manni Freeh and P. 1 a e v is Goldfuss of the Coblentzian. Lower Devonic. Webster lake, north side, J/\ mile east of Telos canal and Matagamon lak
. Annual report. New York State Museum; Science; Science. SOME NEW DEVONIC FOSSILS 203. The umbonal teeth are strongly developed in the left valve as a set of three oblique ridges, behind them being a strong oblique ridge. What may prove to be the right valve of the species has a more convex surface, strong anterior muscle scar and teeth to cor- respond with the sockets of the other valve. This species is like but much more oblique than the P. foil- manni Freeh and P. 1 a e v is Goldfuss of the Coblentzian. Lower Devonic. Webster lake, north side, J/\ mile east of Telos canal and Matagamon lake, on east side i mile above dam, Me. Pterinea chapmani no v. A large left valve has the beak almost terminal, a long straight hinge, lateral teeth not visible but umbonal teeth sharply defined; posterior wing narrow and not extended, anterior wing very small; anterior slope abrupt, almost vertical; umbo narrow elevated, the. Pterinea chapmani general surface of the valve broadly convex; outline oblique. The surface carries faint radial riblets, which are obsolete on the anterior slope. The species differs from any of its associates in its obliquity, abrupt anterior slope, abbreviated anterior wing and short posterior extension. Lower Devonic. Edmunds Hill, Chapman Plantation, Me. Pterinea edmundi now The distinguishing marks of this species are found in its orna- ment and variable outline. In aspect it approaches very closely the P. r a d i a 1 i s from Presque Isle stream but its left valve is sometimes more oblique, sometimes more erect, its umbonal con- vexity less marked. Its sculpture consists of coarse flattened ribs which are more or less irregularly interspersed with ribs of smaller size; on the anterior slope these gradually disappear leaving 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
