PLATE 25. Fossils. 



Figure 



1. Mesocena octogona. 



2. AsterompJialus HooTcerii, side view. 



3. Hemiaulus antarcticus, front view. 



4. Heliopelta Leeuwerihoeclcii, side view. 



5. Asterolampra marylandica, side view. 



6. SymbolopTiora trinitatis, side view. 



7. Coscinodiscus craspedodiscus, side view. 



8. Coscinodiscus craspedodiscus, half a valve. 



9. Climacosphenia moniligera. a, side view ; b, front view. 



10. Terpsinoe musica, front view : side view, PI. 19. fig. 33. 



11. AmpTiipentas alternans, side view. 



12. Bodies found in flint, nature doubtful (see PYXIDICFLA). 



13. Pyxidicula major, front view. 



14. Moss-agate, a, a, silicified fibres of sponge ; 6, gemmules ; c, branched fibre ; 



d, spicula. 



15. Crystalloids of coccolithic chalk, a, simple rings ; 6, radiately striated rings ; 



c, disks. 



16. Actinoptychus senarius. a, side view ; 6, front view. 



17. Actinocyclus undulatus. a, side view; 6, front view. 



18. Campylodiscus clypeus. 



19. Dictyocha gracilis, oblique view. 



20. Dictyocha gracilis, side view. 



21. Dictyocha gracilis, front view. 



Fossil bodies from flint, so-called Xanthidia, but consisting of the sporangia of 

 the Desmidiaceaj. 



27. 

 28. 



29. Vertical (radial) section of coal from Disco, consisting of Coniferous wood 



(Finns}. 



30. Transverse section of the same coal. 



31. Splinter of the same. 



32. Vertical section of silicified wood (Pinus) from Virginia. 



33. Vertical section of silicified wood (Araucaria ?) from Australia. " 



