. Bulletin - United States National Museum. Science. Fig. 17.—Genus Flustra, subgenus Chartella Gray, 1848 A, B. Flustra (Chartella) papyracea Ellis and Solander, 1786. A. Zoarium, natural size. B. Portion showing zooecia and ovicells. (After Hincks, 1890.) Genus SPIRALARIA Busk, 1861 The lateral walls within the covering membrane generally with numerous spinelike denticles. The margins of the zooecium have as a rule more or fewer (occasionally numerous) spines. The avicularia have generally a pointed mandible (Levinsen). Genotype.—Spiralaria jiorea Busk, 1861. Genus HETEROFLUSTRA Levinsen, 19
. Bulletin - United States National Museum. Science. Fig. 17.—Genus Flustra, subgenus Chartella Gray, 1848 A, B. Flustra (Chartella) papyracea Ellis and Solander, 1786. A. Zoarium, natural size. B. Portion showing zooecia and ovicells. (After Hincks, 1890.) Genus SPIRALARIA Busk, 1861 The lateral walls within the covering membrane generally with numerous spinelike denticles. The margins of the zooecium have as a rule more or fewer (occasionally numerous) spines. The avicularia have generally a pointed mandible (Levinsen). Genotype.—Spiralaria jiorea Busk, 1861. Genus HETEROFLUSTRA Levinsen, 1909 Artificial group for unplaced Flustridae. Family HINCKSINIDAE Canu and Bassler, 1927 This family probably forms only a section of a more extended family comprising the Flustridae and Farciminariidae, but as the larvae are unknown we prefer not to make any more important changes in the nomenclature. Hincksina Norman, 1903, Vibracellina, Ogivalina and Membrendoecium Canu and Bassler, 1917, Antropora Norman, 1905, and SetoseUina Calvet, 1907, of this family are described and illus- trated in our work of 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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