(Magnified 500 diameters.) 



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



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



Figs. 4, 6. Spicules from cretaceous clay at Glen Cove, L. I. 



Figs. 6, 1, 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. Namcula viridis, Kutz. Lloyd's Neck, L. L 



Fig. 12. Gymhella cuspidata, Kutz. Lloyd's Neck, L. L 



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



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



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



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



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



Fig. 18. Eacyonema ventricosum, Kutz. Lloyd's Neck, L. L 



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. Namcula cocconeiformis, Greg. Lloyd's Neck, L. I. 



Fig. 24. Stauroneis Phoenecenteron, Ehr. Lloyd's Neck, L. L 



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



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



Cove, L. I. 



Fig. 28. Stephanodiscvs NiagarcB, Ehr, Lloyd's Neck and Glen 



Cove, L. L 



Fig. 29. From clay at Oyster Bay. 



