. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. B. Fig. 6. Dynamena obliqua Lamx. (A); Dynamena quadridentata (Ellis & Sol.), var. nodosa Hargitt (B); and Dynamena crisioides Lamx., var. gigantea Billard (C). A, upper part of stem showing normal arrangement of hydrothecae from PF 12308G. B, an unusual stem with small groups of hydrothecae from DBN 38 iG for comparison with A. Opercular valves in dotted lines. Remarks. Billard (1925) is of the opinion that D. obliqua must remain separate from D. quadridentata, and assigns to it material that ha
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. B. Fig. 6. Dynamena obliqua Lamx. (A); Dynamena quadridentata (Ellis & Sol.), var. nodosa Hargitt (B); and Dynamena crisioides Lamx., var. gigantea Billard (C). A, upper part of stem showing normal arrangement of hydrothecae from PF 12308G. B, an unusual stem with small groups of hydrothecae from DBN 38 iG for comparison with A. Opercular valves in dotted lines. Remarks. Billard (1925) is of the opinion that D. obliqua must remain separate from D. quadridentata, and assigns to it material that has previously been included in the latter species. In the South African collections both species seem to be present, D. obliqua differing from D. quadridentata in the shape of the hydrotheca, the tendency for a grouping in solitary pairs, and in the measurements. Further, D. quadridentata is typically a littoral form and D. obliqua occurs at depths of 24-66 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
