35 225 Dalwynites pleuropteryx, Green (pygidia) Shaly limestone Lower Helderberg group. Clarksville, N. Y. 226 Dalmanites pleuropteryx, Green (interr. of pygidia) Shaly limestone Lower Helderberg group. Clarksville, N. Y. 227 Dalmanites pleuropteryx, Green (doubling of cephalon) Shaly limestone Lower Helderberg group. Clarksville, N. Y. 228 Dalmanites pleuropteryx, Green. (hypostoma) Shaly limestone Lower Helderberg group. Clarksville, N. Y. 229 Dalmanites pleuropteryx, Green. (hypostomas) Shaly limestone Lower Helderberg group. Clarksville, N. Y. 230 Dalmanites pleuropteryx, Green Shaly limestone Lower Helderberg group. Clarksville, N. Y. 231 Platystoma lineatum, Conrad Hamilton group. 18 Mile Creek, N. Y. 232 Platystoma lineatum, Conrad Hamilton group. Hamburg, N. Y. 233 Eurypterus remipes, DeKay. Waterline group. Jerusalem Hill, N. Y. 234 Zaphrentis roemeri, Edwards and Haime. Shaly limestone Lower Helderberg group. Clarksville, N. Y. 235 Zaphrentis roemeri, Edwards and Haime Shaly limestone Lower Helderberg group. Clarksville, N. Y. 236 Zaphrentis roemeri, Edwards and Haime. Shaly limestone Lower Helderberg group. Clarksville, N. Y. 237 Zaphrentis roemeri, Edwards and Haime. Shaly limestone Lower Helderberg group. Clarksville, N. Y. 238 Zaphrentis roemeri, Edwards and Haime. Shaly limestone Lower Helderberg group. Clarksville, N. Y.