. Bulletin - United States National Museum. Science. 336 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Family EURYSTOMELLIDAE Levinsen, 1909 We have reproduced practically all that is known of this family in our 1923 work and have here also illustrated the two species referred to the family. Eurystomella Levinsen, 1909, is the only known Fig. 136.—Genus Pseudoflustra Bidenkap, 1897 A-I. Pseudoflustra solida Stimpson. A, B. Zoarial fronds, natural size. (After Vigelius, 1882.) C. Zoarium with numerous tubular fibers which pass downward from various points on both the surfaces of the zoari
. Bulletin - United States National Museum. Science. 336 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Family EURYSTOMELLIDAE Levinsen, 1909 We have reproduced practically all that is known of this family in our 1923 work and have here also illustrated the two species referred to the family. Eurystomella Levinsen, 1909, is the only known Fig. 136.—Genus Pseudoflustra Bidenkap, 1897 A-I. Pseudoflustra solida Stimpson. A, B. Zoarial fronds, natural size. (After Vigelius, 1882.) C. Zoarium with numerous tubular fibers which pass downward from various points on both the surfaces of the zoarium, uniting below to form a kind of stem. D. Zooecia with ovicells and long frontal avicularia. (C, D. After Hincks, 1880.) E. Zooecia with much-developed peristomes and short salient frontal avicularium. F. Showing the connection between the epidermal covering of the cell and the tubular fiber. G. Outline of orifice of smaller form. H. Same of larger form. (E-H. After Hincks, 1892.) I. Form of the #pertura. (After Levinsen, 1887.) J. Operculum X85. K. Mandible of the avicularium, X250. L. Transverse section showing the two distal sep- tulae. (I-L. After Waters, 1900.) Family SMITTINIDAE Levinsen, 1909 Wo have described and illustrated this family and its various genera in our 1920 work with the exception of the two genera Mal- leatia and Marguetta Jullicn, 1903, now referred here, descriptions of which follow: Genus MARGUETTA JuIIien, 1903 The aperture is semilunar with neither lyrule nor cardelles; the anter is formed conformable to a curve which plunges at 45° below. 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
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