Publisher's Synopsis
Excerpt from Contributions to the Micro-Palaeontology of the Cambro-Silurian Rocks of Canada
Infernal Characters - Tubes in the immature zones, with very thin walls, and crossed by straight or oblique diaphragms; and often there are large cystoid diaphragms present. In the mature zones the walls become very slightly thickened, and small spiniform tubuli can usually be detected; while numerous cystoid diaphragms are always developed in the greater number of the tubes. Immediately above the point of gem mation, the young tube is crossed by numerous straight diaphragms giving it the appearance of an interstitial tube. Subsequently the diaphragms become less crowded, and the young tube assumes the characters of an ordinary cell. The process of gemmation seems to have taken place more especially at certain levels, since tangential sections taken at different heights may show in one comparatively numerous small tubes, intercalated among the ordinary cells, while another may show but few or none of them. Trenton and Cincinnati. (e. O. Ulrich, Journ. Cincinnati Sec. Of Nat. Hist, Vol. V., p. 232.
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