. Bulletin - United States National Museum. Science. 232 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Genus PETALOSTEGUS Levinsen, 1909 The membranous frontal area is covered by a circle of mutually connected platelike or leaf-like hollow spines; a slightly chitinous, semicircular simple operculum. The avicularia are sessile. The zooecia are in one row (Levinsen, 1909). Genotype.—Petalostegus (Catenaria) bicornis Busk, 1884. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
. Bulletin - United States National Museum. Science. 232 BULLETIN 100, UNITED STATES NATIONAL MUSEUM Genus PETALOSTEGUS Levinsen, 1909 The membranous frontal area is covered by a circle of mutually connected platelike or leaf-like hollow spines; a slightly chitinous, semicircular simple operculum. The avicularia are sessile. The zooecia are in one row (Levinsen, 1909). Genotype.—Petalostegus (Catenaria) bicornis Busk, 1884. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
