600 NEW YORK STATE MUSEUM 



(Magnified 500 diameters, eiicept Eig. 1, whicli is enlarged 250 



diameters) 



Fig. 1-13 Sponge spicules. Croton point 



Tig. 14 Melosira granulata (Ehr.) Ralfs. Croton point 



EiG. 15 Navicula Gruendeleri A. S. Croton point 



EiG. 16 Diatoma sp? Plattsburg 



Fig. 17 Diatom fragment from Croton point 



Fig. 18 Navicula permagna Edw. Croton point 



Fig. 19, 20 Sponge spicules. Kreischerville, S. I. 



EiG. 21-24 From clay at Verplank 



Fig. 25 NUszcliia granulata Grun. Croton point 



Fig. 26 From clay at Croton point 



