211 Strophomena rhomboidalis, M'Clellan Shaly limestone Lower Helderberg group Clarksville, N.Y. 212 Strophomena rhomboidalis, M'Clellan Shaly limestone Lower Helderberg group. Clarksville, N.Y. 213 Strophodonta punctulifera, Conrad. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 214 Edrioecrinus pocilliformis, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 215 Edrioecrinus pocilliformis, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 216 Edrioecrinus pocilliformis, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 217 Edrioecrinus pocilliformis, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 218 Spirifera perlamellosa, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 219 Spirifera perlamellosa, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 220 Nuculospira concentrica, Hall. Shaly limestone Lower Helderberg group. Clarksville, N.Y. 221 Hemocrinus scaparius, Hall. (Showing proboscis) Lower Helderberg group. Jerusalem Hill, N.Y. 222 Dalmanites pleuropteryx, Green. (pygidium) Shaly limestone Lower Helderberg group. Clarksville, N.Y. 223 Dalmanites pleuropteryx, Green. (pygidium) Shaly limestone Lower Helderberg group. Clarksville, N.Y. 224 Dalmanites pleuropteryx, Green. (pygidium) Shaly limestone Lower Helderberg group. Clarksville, N.Y.