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 575
549 NORTH AMERICAN EARLY TERTIARY BRYOZOA. trary, the frontal tubules which are much developed about the ascopore; this is a fundamental difference. We are also ignorant of the physiological purpose of the development of the peristomial tubules. The length of the tubules is always very variable, as… … pore. The colony occurs as a Fig. 162. — Genus Siphonicytara Busk, 1884. free, foliaceous expansion with a A-C. Siphonicytara serrulata Busk, 1884. A. Frontal side single layer of zooecia (Levin- °f zooecium, enlarged. B. Zoarium, natural size. C. Dor- sal side showing radical tubes. (A-C after…
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