Organic Siliceous Remains. 239 



much material of this kind is submerged, and near an affluent 

 of Barney River is a good example of a deposit which is now 

 left high and dry. 



The greater proportion of this siliceous material is made up 

 of the frustules or epiderms of about one hundred species of the 

 diatomaceae. The following have been provisionally determined 

 by comparison with the mounted types of Moller, the plates 

 of Schmidt's Atlas, Yan Heurck's Atlas with 3,000 figures of 

 Belgian forms, figures and descriptions by Brun of Geneva in 

 his " Diatomees des Alpes et du Jura," and the descriptions of 

 Rahenhorst in his " Flora Europaea Algarum Aquae Dulcis et 

 Submarinae." 



1. Coccoueis pediculus, Ehr. 



2. C. placentula, Ehr. 



3. Gomphonema acuminatum, Ehr. 



4. " " var. coronatum, Ktz. 



5. " " var. laticeps, Ehr. 



6. Gr. cristatum, Rolfs. 



7. Gr. gracile var. naviculoides, Grun. 



8. G. abbreviatum, Ag. 



9. G. capitatum, Ehr. 



10. G. intricatum, Ktz. 



11. G. cistula, Eemper. 



12. Epitbemia turgida, Ehr. 



13. E. gibba, Ehr. 



14. " " var. parallela, Grun. 



15. E. argus, Ehr. 



16. Himantidium arcus, Ehr. 



17. " " var. majus, W. Sm. 



18. tl " var. tenellum, Grun. 



19. H. formica, Ehr. 



20. H. pectinale, Ktz. 



21. " u var. ventricosum, Grun- 



22. " " var. minus, Ktz. 



23. " te var. undulatum, Ralfs. 



24. H. soleirolii, Ktz. 



25. H. bidens, W. Sm. 



26. " " var. diodon, Ehr. 



27. H. praeruptum var. inflatum, Grun. 



28. H. polyodon, Brun. 



29. H. polydentulum, Brun. 



30. Amphora ovalis, Ktz. 



31. A. afiims, Ktz. 



