terotic of the Lepta Hael beds. Calymene Calicephala also occurs rarely and very rare and then one sees a tall piece of Dastelus partly D. platycephalus. Ostru- coda are commonly prolific in the basal Haell shales but in the limestones if they are present I did not see them. Diastroites are very rare and occur only near the base in the Haell shales. Berulves are always present in about three feet. Endrocas or Oithronas are always present. Williams returned at 2 P.M. driving game to the tip of the mountain and Mr Gregg Banks a reality printed out by Whittaker. According to his barometer readings the distance from the top of the Trenton to the base of the Leptaegha abdominalis beds is about 750 ft. This then is the thickness for the shale series of the Ordovician between the Trenton and the Silurian. As the Haell Wica is 80 ft thick this leaves 670 ft