. Bulletin - United States National Museum. Science. NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 65 the presence of an ovicell. The retractor muscles of the polypide are attached in one of the zooecial angles. This results in a dissymmetry of the opesium and of the o'pesiules as in Steganoporella, Onychocella, etc. Like Waters, 1899, we have thought that Membranipora savartii Audouin, 1826, belonged to this group of species. It is in fact also provided with spinous processes and rather frequently with a proximal denticular plate. But this analogy is not sufficient; for, first, the op
. Bulletin - United States National Museum. Science. NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 65 the presence of an ovicell. The retractor muscles of the polypide are attached in one of the zooecial angles. This results in a dissymmetry of the opesium and of the o'pesiules as in Steganoporella, Onychocella, etc. Like Waters, 1899, we have thought that Membranipora savartii Audouin, 1826, belonged to this group of species. It is in fact also provided with spinous processes and rather frequently with a proximal denticular plate. But this analogy is not sufficient; for, first, the opesium is symmetrical; second, we do not know whether there are opesiules in the chitinous cryptocyst; third, the operculum is totally different; and, fourth, there are only 15 tentacles. The characteristics of this genus are much more visible on Memhranipora occultata Waters, 1887, wherefore we believe it wise to add it as a second 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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