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Extra resources for Principles of Zoological Micropalaeontology

Example text

With the outer cuticle, or tube (in tube-building worms) (Du Bois). H e sees a further point in support of this argument in other groups of invertebrates, namely the inarticulate brachiopods where chitin as well as calcium phosphate participates in the structure of the valve. Rohon and Zittel (1886) compare the conodonts to the jaw apparatus of annelid worms belonging to the class Gephyrea. Denham (1944) thinks they are like the chitinous copulatory organs of nematodes and flatworms (turbellarians).

Scott, 1934), while the vertebrate dental units are orientated dorso-ventrally. 46 P R I N C I P L E S OF ZOOLOGICAL MI CRO PALAEONTOLOGY 4. Like the scolecodonts, the great majority of conodonts show a lack of wear. This suggests that they were used for gripping and not mastication (H. W. Scott, 1934). 5. Some conodonts were fixed by the posterior or median parts only which suggests that they belong to worms rather than fish (H. W. Scott, 1934). 6. The point made by Du Bois, namely the occurrence of calcium phosphate in worms and other invertebrates, also suggests that conodonts are component parts of worms.

The laminae are coarser, less distinct, and become flattened towards the base. The basal surface of the funnel filling is uneven and, in the conodonts studied by Gross, the funnel was more frequently preserved than the funnel FIG. 573. Spathognathodus filling. In conodonts from the Upper Devonian murchisoni PANDER. Cross of Lithuania, Gross stated that their basal filling section through the posteis not differentiated into funnel and funnel rior end. p = pseudo-pulp cavity; z = tip. Silurian, and an uneven basal surface.

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