Report Volume 48, PT. 2 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...due to the fact that although the radiating ridges are not prominent, they are This was the type specimen of Rceeptaculites montleulalus (Hull, 1S83. Rep. State Geologist for 1882, expl. pi. XXIII, figs. 3-9, 11), before Prof. Hall considered the species a synonym of R. iufundtIntHformis. straight and continuous. Furthermore, these forms under discussion are of a comparatively large size, whereas the specimen of the monticulatus type is a small one, representing only the circumpolar region, where the reticulations, as they become finer, are less distinctly indicated. The radial tubes appear only as hemispherical depressions, one in the center of each rhomb. NO details of structure are well defined. Fractures on several specimens show traces of the extension of the tubes upward, and one preserves indications of a roofing wall. That it is not the inner wall of the basal portion to which it is at present adjacent is shown by the fact, that not only does the upward prolongation of the tubes fall short of the line that indicates the structure in question, but furthermore it is continuous with the outer wall. It is difficult, if not impossible, to determine the exact nature of preservation of these specimens. The fact that they are more or less silicified suggests that they represent the organism itself. On the other hand, since the portion preserved exists only as a surface, apparently without thickness, it seems credible that they are nothing more than casts. Yet this again is contradicted by the detail of the outer surface, which, on the whole, is the same as that of the pyritized specimen. Perhaps the forms in question result from a maceration of the original organism, producing a fossil which presents both internal and external characters at the same time. T...