(Magnified 500 diameters.) 



Figs. 1, 2. Jointed hair. Wyandance, L. I. 



Fig. 3. Ridged tube from stoneware clay. Glen Cove, L. I. 



Figs. 4, 5. Spicules from cretaceous clay at Glen Cove, L. I. 



Figs. 6, 7, 8. Spicules from Lloyd's Neck, L. I. 



Fig. 9. Spicule fragment? Farmingdale, L. I. 



Fig. 10. Diatoma hyemale. Glen Cove, L. I. 



Fig. 11. Navicula viridis, Kutz. Lloyd's Neck, L. I. 



Fig. 12. Cymbella cuspidata, Kutz. Lloyd's Neck, L. I. 



Fig. 13. Campyloneis Grevillei, var. Regalis. Lloyd's Neck, L. I 



Fig. 14. Cocconema parvum, W. Smith. Northport, L. I. 



Fig. 15. Triceratium trifoliatum. Lloyd's Neck, L. I. 



Fig. 16. Eunotia monodon, Ehr. Lloyd's Neck, L. I. 



Fig. 17. JVavicula lata, Breb. Lloyd's Neck, L. I. 



Fig. 18. Etieyonema ventricosum, Kutz. Lloyd's Neck, L. I. 



Fig. 19. Synedra affinis, K. B. Lloyd's Neck, L. I. 



Fig. 20. Fragilaria construans, Grun. Lloyd's Neck, L. I. 



Fig. 21. Gomphonema capitatum, Ehr. Lloyd's Neck, L. L. 



Fig. 22. Epithema turgida (Ehr.) Kutz. Lloyd's Neck, L. I. ™ 



Fig. 23. JVavicula cocconeiformis, Greg. Lloyd's Neck, L. I. 



Fig. 24. Stauroneis Phcenecenteron, Ehr. Lloyd's Neck, L. I. 



Fig. 25. From clay at Northport, L. I. 



Figs. 26, 27. Melosira granulata (Ehr.) Ralfs. Lloyd's Neck and Glen 

 Cove, L. I. 



Fig. 28. Stephanodiscus Niagara, Ehr. Lloyd's Neck and Glen 



Cove, L. I. 



Fig. 29. From clay at Oyster Bay. 



