. The Geology of Minnesota . r ofthe generic groups above outlined and will be referred to in discussing the generafurther on. We ought perhaps to have included the illy characterized genus Conchopeltis,Walcott, among the Paleozoic Batellidce, especially since the types of the secondspecies describedby the author of the genus came from the Lower Silurian ofMinnesota. As neither is illustrated, we must rely upon Walcotts description of thegenus. That gives us to understand that it is founded on conical patelliformunivalves having the apex subcentral and the surface radially striated. So far as
. The Geology of Minnesota . r ofthe generic groups above outlined and will be referred to in discussing the generafurther on. We ought perhaps to have included the illy characterized genus Conchopeltis,Walcott, among the Paleozoic Batellidce, especially since the types of the secondspecies describedby the author of the genus came from the Lower Silurian ofMinnesota. As neither is illustrated, we must rely upon Walcotts description of thegenus. That gives us to understand that it is founded on conical patelliformunivalves having the apex subcentral and the surface radially striated. So far as itgoes it agrees with Scenella and that indeed is the position we assign to G. minneso-tensis Walcott. After considerable trouble Prof. N. H. Winchell succeeded in having drawingsprepared of C. alternata, the first species described by Walcott, and the one thereforeto be regarded as the type of the genus. As may be seen from the accompanyingfigures, the slopes in this species are divided into four, slightly convex, lobe-like.
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Keywords: ., bookcentury1800, bookdecade1890, bookidgeologyofmin, bookyear1897
