. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. hinge joint SERTULARELLA SERTULARIA. Margin perpendicular to axis tilted towards abcauline side tilted towards adcauline side SHAPE IN SERTULARELLA Fig. 78. Sertulariidae: hydrothecal shape and structure. Possibly as a result of curvature the hydrotheca may have internal folds, or intrathecal septa, and these may be adcauline or abcauline or on both sides. They form a useful point of attachment for the hydranth and are characteristic of many species of Sertularia and of the genus Crateritheca. In the
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. hinge joint SERTULARELLA SERTULARIA. Margin perpendicular to axis tilted towards abcauline side tilted towards adcauline side SHAPE IN SERTULARELLA Fig. 78. Sertulariidae: hydrothecal shape and structure. Possibly as a result of curvature the hydrotheca may have internal folds, or intrathecal septa, and these may be adcauline or abcauline or on both sides. They form a useful point of attachment for the hydranth and are characteristic of many species of Sertularia and of the genus Crateritheca. In the sessile species the hydrotheca has a definite floor of perisarc with an excentric hydropore. The hydropore is close to the abcauline side, and the floor is attached to, and continuous with, the base of the adcauline wall. The adcauline wall is often produced below the floor as a thickened knot of perisarc. Also included in the Sertulariidae are a few genera with stalked, yet oper- culate, hydrothecae. These have in the past been included variously in the Campanulinidae, Campanulariidae and Sertulariidae. Mammen (1965a) created for them a new family, the Thyroscyphidae. Of these, the genera Thyroscyphus and Parascyphus were reviewed by Splettstosser (1929), who also created a new genus, Cnidoscyphus, for certain species on the basis of nematocyst structure and arrangement. {Cnidoscyphus is not recognized in the present work,. 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 South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
