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abruptly rounded angular appressed arcuate basal margin gently basal margin regularly Beaks sub-anterior becoming gibbous Canandaigua lake Cardinal line straight cardinal margin cardinal slope cardinal view cast Cayuga lake Chemung group cincture concentric striae Conrad Edmondia elongate end short extending fasciculate fold Formation and locality Fultonham genus Grammysia gutta-percha Hall Hamilton group hinge hinge-line incurved Interior unknown ligamental lunule margin regularly curving middle MODIOMORPHA muscular impression muscular scars N. Y. Fig Notice Lamellibranchiata obliquely truncate Onondaga county pallial line Plates and Explanations post-cardinal slope post-inferior extremity posterior end Posterior extremity posterior margin posteriorly Prelim prominent radii regularly rounded sandstone Schoharie county shales Shell large Shell of medium Shell small specimen described specimens measure respectively sub-angular sub-truncate Surface marked Three specimens measure tigs twice the height umbo umbonal region umbonal ridge Umbonal slope Valves moderately convex Valves regularly convex Waverly Waverly group XCIV