PLATE ]9.— Fossils. 



Figure 



1. Mesocena octogona. 



2. Asteromphalus Hookerii^ side view. 



3. Hemiaulus antarcticus^ front view. 



4. Heliopelta Leeuivenhoeckii, side view. 



5. Asterolampra marylandica, side view. 



6. Symholophora trinitatisj side view. 



7. Coscinodiscus craspedodiscus, side view. 



8. Coscinodiscus craspedodiscus, half a valve. 



9. Climacosphenia moniligera, «, side view ; 5, front view. 



10. Terpsinoe musica, front view (side view, PL 14. fig. 33). 



11. Amjphipentas alternans, side view. 



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



13. Pyxidicula major, front view. 



14. Agate. «, «, fibres of sponge ; h, gemmules ; c, branched fibre ; d, spicula (all 



doubtful) . 



15. Crystalloids of chalk, a, simple rings; 6, transversely striated rings; c, disks. 



16. Lagena Icevis. b, section. 



1 7. Lagena gracilis. 



18. Lagena striata. 



19. Entoselenia globosa. ^, section. 



20. Entoselenia squamosa, var. catenulata. 



21. Entoselenia squatnosa, var. hexagona. 

 22.1 

 23. 

 24. 

 25. 

 26. 

 27. 

 28.J 



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



{Pinns^. 



30. Transverse section of the same coal. 



31. Splinter of the same. 



32. Vertical section of silicified wood (Pi?ius) from Virginia. 



33. Vertical section of silicified wood {Araiicaria ?) from Australia. 



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

 the Desmidiacese. 



