21 127 Platyceras gibbosum, Hall. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y. 128 Platyceras incile, Hall. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y. 129 Platyceras pileiforme, Hall. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y. 130 Mariocrinus pachydaetylus Conrad Lower. Helderber grmp. Jerusalem Hill, N.Y. 131 Atrypa impressa, Hall. Schokarie grit Clarksville, N.Y. 132 Dalmanites concinnus, Hall. Schokarie grit Clarksville N.Y, 133 Lepadocrinus gehardi, Conrad. Lower Helderberg grmp. Jerusalem Hill, N.Y. 134 Homocrinus scoparius, Hall. Lower Helderberg grmp Jerusalem Hill, N.Y. 135 Homocrinus scoparius, Hall, Lower Helderberg grmp. Jerusalem Hill, N.Y. 136 Homocrinus scoparius, Hall, Lower Helderberg grmp. Jerusalem Hill, N.Y. 137 Nuculites oblongatus, Conrad, Hamilton group. Pratt's Falls. New York. 138 Pentamerus galeatus Dalman. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y. 139 Acidaspis hamata, Conrad. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y. 140 Acidaspis hamata, Conrad. Shaly limestone Lower Helderberg grmp. Clarksville, N.Y.