49 323 Ptilodictya tenuis Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 324 Brachiocrinus nudosarius, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 325 Spirefera vasuxeni, Hall. Pentaeculite limestone Lower Helderberg group. Schoharie, N.Y. 326 Dalmanites pleuropteryx Green. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 327 Streptorhynchus radiatus, Vanuxem. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 328 Strophodonta punctulifera, Conrad. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 329 Strophodonta beeki, Hall. Lower Helderberg group. Cedarville, N.Y. 330 Strophodonta beeki, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 331 Strophodonta beeki, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 332 Strophomena conradi, Hall. Lower Helderberg group. Cedarville, N.Y. 333 Strophomena conradi, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 334 Strophodonta varistriata, Conrad. Lower Helderberg group. Jerusalem Hill, N.Y. 335 Strophodonta varistriata, (Conrad). Scutella limestone Lower Helderberg group. Clarksville, N.Y. 336 Strophodonta varistriata, var. arata, Hall. Lower Helderberg group. Cedarville, N.Y.