Box 26, Folder 1: Paleontology Draft 7: AcePhala I

Amborychia orbicularis, Hall, Pal. of N.Y. vol. 1 p 164 pl. 36 fig 5; Pterinea orbicularis, Emmons, N.Y. Geol. Report 1842 p. 397 fig. 3

Rhomboidal, or suborbicular, very ventricose in the middle & upper parts of the shell, regularly curved anteriorly & somewhat compressed & alated behind; umbones ventricose, narrowing above, very prominent, extended & incurved into a kind of hook or claw, which turns forward at the extremity; cardinal line moderately extended, straight; surface of the shell ornamented by a fine radiating striae, which are crossed by sharp concentric elevated lines; cast smooth, marked by the large oval muscular impression of the shell.

L. 2 - H. 1.7 - D 1.0

Lower Silurian-Trenton Limestone

Watertown NY

Ambonychia radiata, Hall, Pal. of N.Y. vol. 1 p. 292 pl. 80 fig. 4; Pterinea carinata, Conrad, N.Y. Geol. Rep. 1838 p. 114, & 1839 p. 63; Vanuxem, N.Y. Geol. Rep. p. 65 fig. 1; Emmons, N.Y. Geol. Rep p 402 fig. 1; (not of Goldfuss)

Equivalve, obliquely obovate, extending into acute [points] curbing beaks; anterior slope nearly straight above, and rounded below; posterior slope oblique, scarcely alate; surface marked by twenty five to forty strong simple radii, which are crossed by fine concentric striae; radii flattened upon the top; the intermediate spaces are regularly concave grooves, narrower than the radii, and marked by the concentric striae.

[L. 0.4 to 1.4 - H 0.9 to 2.8] L 0.7 to 1.7 -H 0.9 to 2.8

Lower Silurian-Hudson River Group

Boonville, Turin, Loraine, Pulaski, Washingtonville, Mexico, near Rome, & Waterford N. York; Cincinnati & Oxford Ohio; Madison Ia. Mayville Ky. Drummonds' island, L. Huron Bay du Noquet, Mich Penna (Matinal Shales)

Ambonychia undata, Hall Pal. of N.Y. vol. 1 p. 165 pl. 36 fig. 7. Pterinea undeeta Emmons, Geol. Report 1842 p 395 fig. 1

Obliquely ovate or subrhomboidal, with the base rounded, ventricose anterior margin obtuse, straight above and curving below; posterior margin compressed, scarcely alate above; cardinal line straight, oblique; umbones ventricose, elevated, narrowing above and scarcely incurved, with the extremities bending forward; surface with broad, smooth, concentric undulations which curve downwards more abruptly on the centre of the shell; anterior side scarcely concave below the beaks

L. 1.2 -H. 1.0 - D. 0.8