. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 34 ANNALS OF THE SOUTH AFRICAN MUSEUM The paratype consists of 2 steins, the larger i -g cm. in height, in which certain irregularities occur; thus 2 of the stem internodes bear but one hydrotheca each, and there is a tendency towards stolon formation from the tips of the hydrocladia. Genus Sertularella Remarks on the diagnosis of species As has been indicated by Picard (1956) and Millard (1958), the shape of the hydrotheca is sometimes used as a basis for specific differentiation in Sertularella. Th
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 34 ANNALS OF THE SOUTH AFRICAN MUSEUM The paratype consists of 2 steins, the larger i -g cm. in height, in which certain irregularities occur; thus 2 of the stem internodes bear but one hydrotheca each, and there is a tendency towards stolon formation from the tips of the hydrocladia. Genus Sertularella Remarks on the diagnosis of species As has been indicated by Picard (1956) and Millard (1958), the shape of the hydrotheca is sometimes used as a basis for specific differentiation in Sertularella. Thus, Picard distinguishes between species in which the margin is tilted towards the distal end of the colony, and those in which the margin is tilted towards the base. However, it has been found in practice that the category is not always obvious, due to variations in the curvature of the walls and elongation of one or other marginal tooth, and if such categories are to be used it is necessary that they should be more accurately defined. It is proposed, therefore, to distinguish three hydro thecal types, which are defined as follows (fig. 11):. 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
