PLATE 25.— Fossils. 



Figure 



1. Mcsocena octogona. 



2. Asteromplialus Hookerii, side view. 



3. Hemiaulus antarcticus, front view. 



4. Heliopelta Leeuwenhoeckii, side view. 



5. Asterolampra marylandica, side view. 



6. Symbolophora trinitatis, side view. 



7. Coscinodiscus craspedodiscus, side view. 



8. Coscinodiscus craspedodiscus, half a valve. 



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



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



11. Amphipentas alternans, side view. 



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



13. Pyocidicida major, front view. 



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



d, spicula. 



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



c, disks. 



16. Actinoptyclms senarius. a, side view ; b, front view. 



17. Actinocyclus andulatus. a, side view; b, front view. 



1 8 . Campylodiscus clypeus. 



19. Dictyocha gracilis, oblique view. 



20. Dictyoclia gracilis, side view. 



21. Dictyocha gracilis, front view. 

 220 

 23 

 24 

 25. ) 

 26. 

 27. 

 28. 



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



(Pinus). 



30. Transverse section of the same coal. 



31. Splinter of the same. 



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



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



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

 the Desmidiaceaj. 



