A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) ... / With 7 plates and 96 textfigures.
- British Museum (Natural History). Department of Geology
- Date:
- 1911
Licence: In copyright
Credit: A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) ... / With 7 plates and 96 textfigures. Source: Wellcome Collection.
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![Examples : Fluslra (Fig. 61), Mcvihranipora (Fig. 65 a), Ony- cliocdla (Fig. 65 h). In many Bryozoa certain individuals are modified for special duties. Thus in the Cheilostomes the growth of the operculum has produced snapping beaks, called avicularia, and long movable bristles, called vibracula; the positions occupied by these appendages can be detected in the fossils (Fig. 65). Sometimes individuals are set apart and modihed for reproduction, sometimes special pouches for the reception Fig. G4.—Oyclostoraatous Bryozoa from the Bathonian (Bradford Clay) of England, a, Slomatopora clichotoma, part of an encrusting colony, natural size, and magnified 25 diameters, h, Bcrenicca cempressa, an encrusting colony, natural size, and part of it magnified 12 diameters. (After J. W. Gregory.) of the developing eggs are attached to the chambers (Fig. 65 a). These modifications suggest explanations for the smaller chambers and tubes interspersed among the normal ones in the fossils of extinct Orders. AVe may now briefiy review the exhibited specimens. First are shown exani])les of the mode of occurrence of Bryozoan fossils, the rocks formed by them, and the habit of life of extinct species. The British series begins with some from the Ordovician rocks of AVales. These are so poorly preserved that they can only be determined by the help of better specimens from Gallery VIII. Case A4, West Side.](https://iiif.wellcomecollection.org/image/b24863841_0145.jp2/full/800%2C/0/default.jpg)
