List of Lower Silurian Fossils, Cincinnati Group. 71 



Genus Anomalodonta., S. A. Miller. Gr. nnomalos, irregular; odous, 



odontos, a tooth. 



201 Auomalodouta gigantea, S. A. Miller. Gr. gigas, large. 



202 alata, Meek. L. alatus, winged. 



Family Arcidm. L. area, a chest. 

 Genus, J/e^rt»«6o;uV(, Billings. Gr. megas, great; ambon (L. umbo). 



203 Megambonia, Jamesi, Meek. 



Genus Tellinomya., Hall. Gr. telline, a shell-fish; niyax, a mussel. 



204 Telliuomya Cincinnatiensis, Hall. 



205 gibbosa, Hall. L. gibbosus, humped. 



206 Hilli, S. A. Miller. 



207 levata, Hall. L. levatus, polished. 



208 obliqua, Hall. L. obliquus, awry. 



209 pectunculoides, Hall. L. pectiinculus, dim. pecten., a small 



scallop; Gr. eidos, form. 



210 cingulata, Ulrich. L. cingulus, a girdle. 



Genus Cyrtodonta, Billings. Gr. kurtos, curved; odous., a tooth. 



211 Cyrtodonta (Cypricardites) Hindi, Billings. 



Family Trigoniidoi. Gr. treis, three; gonia, an angle. 

 Genus Lyrodesma, Conrad. Gr. lura, a lyre; desma, ligament. 



212 Lj'rodesma planum, Conrad, L. ^jZo«m.s, even or flat. 



213 Cincinnatiensis, Hall. 



214 postriatum, Conrad. L. ^:>os^, after; s^rir?, a ridge. 



Division Siphonata, Gr. siphon, a tube. 

 Family CyjJrinidos. Gr. Kupris, Venus. 

 Genus Cycloconcha, S. A. Miller. Gr. kuklos, circle; kogche^ a mussel. 



215 Cyclocoucha mediocardinalis, S.. A. Miller. L. medius, the middle; 



cardinalis, relating to tlie hinge. 



Genus Cypricardites, Conrad. Gr. Kupris, Venus; kardia, heart. 



216 C3'pricardites carinata. Meek. L. carina, a keel. 



217 Hainesi, 8. A. Miller. 



218 Sterlingensis, Meek and Worthen. 



219 sub-truncata, Hall. L. sub, somewhat; truncatus, cut off". 



220 ventricosa, Hall. L. ventricosus, swollen, inflated. 



221 quadrangularis, Whitfield. L. quatuor, four; anguliis, corner. 



