The Quarterly journal of the Geological Society of London . ^, are only preserved in the outer parts of the septum, andconsequenth^ do not appear in any but the outermost , even in the inner septal sections, main folds are genei-allymore acute than in development. This is due to the absence of acentral flattened part 1] THE MOEPHOLOGY OF THE AM^EOXTTE SEPTTTM. 49 Nevertheless, the similarity is sufficiently striking to justify theopinion that the principle educed from the septa of normally-shapedand compressed whorls holds good also, with the limitations noticed,for form
The Quarterly journal of the Geological Society of London . ^, are only preserved in the outer parts of the septum, andconsequenth^ do not appear in any but the outermost , even in the inner septal sections, main folds are genei-allymore acute than in development. This is due to the absence of acentral flattened part 1] THE MOEPHOLOGY OF THE AM^EOXTTE SEPTTTM. 49 Nevertheless, the similarity is sufficiently striking to justify theopinion that the principle educed from the septa of normally-shapedand compressed whorls holds good also, with the limitations noticed,for forms with depressed whorls. Fig. 17.—Section of the whorl of Sphseroceras hrongniarti alongthe datum-plane of the septum of which septal sections areshown in fig. 16 (p. 48). The lines parallel to the peri-pherif shoic the positions of these sections.
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
