. Bulletin - United States National Museum. Science. 60 BULLETIN 100, UNITED STATES NATIONAL MUSEUM simply to render a little more intelligible the descriptions of the very mediocre classificator, Oken. We adopt the principle of least change based on long usage. It will always be very difficult to harmonize the ancient authors, ignorant of the structure of the bryozoa, with the precision and exactness of modern Fig. 2.—Genus Eucratea^Lamouroux, 1812 A-C. Eucratea chelata Linnaeus 1758. A. Zoarium natural size. B. Zoarial fragment with its radicells, X 24. The basal edge of the distal
. Bulletin - United States National Museum. Science. 60 BULLETIN 100, UNITED STATES NATIONAL MUSEUM simply to render a little more intelligible the descriptions of the very mediocre classificator, Oken. We adopt the principle of least change based on long usage. It will always be very difficult to harmonize the ancient authors, ignorant of the structure of the bryozoa, with the precision and exactness of modern Fig. 2.—Genus Eucratea^Lamouroux, 1812 A-C. Eucratea chelata Linnaeus 1758. A. Zoarium natural size. B. Zoarial fragment with its radicells, X 24. The basal edge of the distal wall is not angular, the ovicelled zooecia are attached either proximally to the frontal area or to the basal surface of other zooecia (after Milne Edwards). C. Ovicelled zooecium; it is of smaller size, X25 (after Levinsen, 1894). Fig. 3.—Genus Scruparia Hincks, 1857 D-G. Scruparia clavata Hincks, 1880. D. Biserial form with ovicelled zooecia, X50. E. Basal side of biserial form, X50. F. Uniserial form, X50. G. Group showing the mode of branching, X50. (A-D, after Hincks, 1SS0.) Family GEMELLARIIDAE Busk, 1859 The zoarium is flexible, radiccllcd. The zooecia are club-shaped, with a large gymnocyst. No ovicell. Larva unknown. Genus GEMELLARIA Van Beneden, 1845 The zooecia are in pairs back to back. The basal edge of the distal wall is angular. The radical fibers issue from the lateral margin in the proximal part of the zooecium. 12-14 tentacles. Genotype.—Gemellaria (Sertularia) loricata Linnaeus, 1758. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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