43 281 Mytilarea mytilina, Conrad Lower Helderberg grmp. Clarksville, N. Y. Shaly limestone 282 Megambonia obscura, A. Lower Helderberg grmp Clarksville, N. Y. Shaly limestone 283 Mytilarea cordiformus, Hall. Lower Helderberg group. Clarksville, N. Y. Shaly limestone 284 Semphoceras impar, Hull, Corniferous limestone Columbus Ohio, 285 Receptaculites infundibuliformis, Eaton Shaly limestone Lower Helderberg grmp. Clarksville, N. Y. 286 Receptaculites infundibuliformis, Eaton Shaly limestone Lower Helderberg group. Clarksville, N. Y. 287 Receptaculites infundibuliformis, Eaton Upper Pentamerus Lower Helderberg grmp. Clarksville, N. Y. 288 Orthoceras longicameratum, Hall. Shaly limestone Lower Helderberg group. Clarksville, N. Y. 289 Dalmanites archiops, New (pygidium) Scholarie grit. Clarksville, N. Y. 290 Receptaculites infundibuliformis, Eaton, Shaly limestone Lower Helderberg grmp. Clarksville, N. Y. 291 Modiomorpha concentrica, Conrad. Hamilton group. Shore of Skaneateles Lake N. Y. 292 Modiomorpha concentrica Conrad, (Sherry tell?) Hamilton group. Shore of Skaneateles Lake N. Y. 293 Orthoceras n. sp. Shaly limestone Lower Helderberg grmp. Clarksville, N. Y. 294 Orthoceras rudis, H Shaly limestone Lower Helderberg grmp. Clarksville, N. Y.