Spirifer Magareneus, Big Creek. Jefferson Cr., J. F. H., * Osgood beds, 22 ribs distinct from for 26-28 Orthoceras anniceps, Big Creek, Jefferson Co. Osgood beds, J. F. H., * Most of the specimens are distinctly annulated and have low indistinct longitudinal ridges crossing and to the curve of the trans- verse striae. About 13-19 longitudinal low ridges. The transverse strice are a little more distant than in recent Waldron forms. Several of the same type of shells have been found at Wavona in the Waldron shale however, and are Osgood specimens from Big Creek resembles ordinary Waldron types & having only low annulation and close strice. a very variable shell. Spirifer Radiata Big Creek, Jefferson Cr., J. F. H., * Osgood beds, Platystoma Magareneus! One specimen like Fig. 2-4, 5-7. Plate 29 as far as fields in collections are concerned. One has longitudinal strice like Fig. 2-4. Both lean mouth of Platystoma as far as I can judge. Big Creek, Osgood. Jeff. Co. J. F. H., * a little broader & plenter than Waldron forms. Strict practically the same. Ceratopyra imbricata. Big Creek Osgood beds, J. F. H. One specimen with 6 radiating depressed grooves at centre. Receptaculites species uncertain, J. F. H.* Osgood bed. Big Creek. Spirifer radiata occurs also just above Cliff creek at Madison. J.F.H., * Spirifer with radiating strice of Sp. endera and concentric ridges of Sp. Rivzusa, is this the ancestral form of cristina? Big Creek, Jefferson Cr. J. F. H., * Osgood beds,