(the large flatness) came from the upper 20 inches just beneath the fauna layer. What we have learned in regard to the strophodontata sequence is this. The history begins in the Callaway limestone. The earliest forms in the Craighead are flat, transverse, coarsely plicated forms. The evolutionary tendency among those are toward alation and earing, more convexity and probably a tendency to form plications. In the Byrnes beds just below at Lockneart to the byrnes, strophopora and carus, the hinge shading, keumpling begins with decided bifurcation or implantation of new striate. It is here that the angularated large once or less autquadrati form occurs. Stigda of the murelii type becomes more ad more abundant and continues into the upper Craighead. The large flat forms (within Callawayensis) may be an outgrowth of the earlier strial or may be a new origiant. The whole history of those strophodontatas is de- crified in the lower half of the Lower Craighead, I.E. up to and including the Byrnes bed. Later there is little new development. The Devonian occurs in the bluffs of the Missouri opposite to Jefferson City. Edgemond fauna of Purley mixed with Trenton fauna, Dr says maybe. Strophia neumwinstris here belongs tetuns.