Proceedings of the Davenport Academy of Natural Sciences, volume 4
Proceedings of the Davenport Academy of Natural Sciences, volume 4
Davenport Academy of Natural Sciences, Women's Centennial Association
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Col- umn round, composed of equal joints, thickened in the middle, thinned at the outer edges. Central canal round. The surface markings are by ridges of uniform strength throughout. At the base of the calyx they form a pentagon, the angles of which rest just above the center of the first radial. From this point they traverse the center of each plate in the radial series, forming with the side of the pentagon a large hexagonal figure, the most noticeable feature in this species. They connect in... single or double Hnes the center of each radial with the center of the figure, which is also the center of the first interradial. From a small cup at this point two or three parallel ridges pass through the second interradial. Geological position^ locality^ etc.: Associated with the preceding spe- cies, this was obtained by the writer from rocks of the age of the Hamilton group, in the neighborhood of Alpena, in Northern Michi- gan, the type specimens being in his collection. Digitized by Google DAVENPORT ACADEMY OF NATURAI.
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