. Bulletin - United States National Museum. Science. 418 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Genus HIPPOPORIDRA Canu and Bassler, 1927 The ovicell is hyperstomial and bears a frontal area. The zooecia are accumulated; the frontal is surrounded by areolar pores and often bears small avicularia. The aperture is formed of an anter and a poster separated by two cardelles. The large interzooecial avicularia are acuminated. Genotype.—Hippoporidra (CeUepora) edax Busk, 1859. Range.—Miocene—Recent. The known species of this genus are as follows: Hippoporidra {CeUepora) edax Busk, 1859 Recent,
. Bulletin - United States National Museum. Science. 418 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Genus HIPPOPORIDRA Canu and Bassler, 1927 The ovicell is hyperstomial and bears a frontal area. The zooecia are accumulated; the frontal is surrounded by areolar pores and often bears small avicularia. The aperture is formed of an anter and a poster separated by two cardelles. The large interzooecial avicularia are acuminated. Genotype.—Hippoporidra (CeUepora) edax Busk, 1859. Range.—Miocene—Recent. The known species of this genus are as follows: Hippoporidra {CeUepora) edax Busk, 1859 Recent, fossil. Hippoporidra (Lepralia) calcarea Smitt, 1873 Recent, fossil. Hippoporidra {Lepralia) maculata Ulrich and Bassler, 1904 Miocene. Hippoporidra [Lepralia) parvula Canu and Bassler, 1923 Fig. 163.—Genus Hippoporidra, new genus A, B. Hippoporidra edax Busk, 1859. A. Zoarium, natural size. B. Zooecia X40. (A, B. After Hincks, 1880.) C-H. Hippoporidra calcarea Smitt, 1873. C, D. Subcylindrical colonies, natural size. E. Ordinary zooecia, X40. F. Surface with ovicelled zooecia and avicularia, X40. (C-F. After Smitt, 1873.) G, H, Two opercula, one (G) of ordinary zooecium and another (H) of an ovicelled one, X85. Genus HIPPOTREMA Canu and Bassler, 1927 The ovicell is hyperstomial and is not closed by the operculum. The zooecia are piled upon each other in disorder; their frontal is perforated by tremopores. The aperture is formed by a large orbicular anter and by a short poster, separated by two cardelles. The operculum does not have lateral linear attachments. Genotype.—Hippotrema (Lepralia) javthina Smitt, 1873. lianrje.— 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 : Smi
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