United States National Museum, Smithsonian Institution, United States. Department of the Interior · Washington : Smithsonian Institution Press, [etc.]; for sale by the Supt. of Docs., U.S. Govt Print. Off. · leaf 661
635 NORTH AMERICAN EARLY TERTIARY BRYOZOA. The calcareous skeleton is exteriorly porous (fig. f 96 A, D). At each pore in the general cavity1 there are corresponding spherular leucocytes (fig. 196 E). … D x 100 Fig. 196. — Structure of Hie tubes. A. Longitudinal section of Entalopliora raripora D’Orbigny enlarged, showing that each tube grows from the dorsal of the proximal tube. (After Beissel, 1865.) B. Tangential section of the dorsal side of Plagioecia concreta new species, X 12, illustrating…
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