PLATE LX. 



StICTOPORA INCISURATA. 

 Page 241. 

 Fig. 1. A pai-t of a frond, natural size, showing its form and manner of growth. 



Hamilton gi-oiip. Near MutUmville, township of Nirrth Bristol, Ontario county, N. Y. 

 Fig. 2. An enlargement, showing decidedly serrulate margins. (X 6.) 



Hamilton group. Kashong creek, Bellona, Yates county, N. Y. 

 Fig, 3. An enlargement from another fi-ond, showing irregularly disposed, oblique cell apertures, 

 originally described as Stictopora obliqua. (X 6.) 



Hamilton group. Near Lodi Landing, Seneca Lake, N. Y. 

 Fig. 4. An enlargement of a section, showing the intercellular vesicles. (X 6.) 



l^Iamilton gi-oup. Lodi Landing, N. Y. 

 Fig. 5. An enlargement, showing the rootlets and pedicel of a frond. All the bases observed have a 



similar appeai-ance to this one. (X 6.) 

 Fig. 6. An enlargement, showing very oblique cell apertures, disposed in essentially parallel longitudi- 

 nal rows. (X 6.) 



Hamilton group. FaU-brnok, four milet east of Canandaigua Lake, iV. Y. 

 Fig. 7. An enlargement of a narrow branch, showing oval cell apertures, where the ranges are sep- 

 arated by strong striae. (X 6.) 



Hamilton group. Near Muttotiville, North Bristol township, Ontario county, N. Y. 

 Fig. 8. An enlargement, showing bi*oad, tlattened, longitudinal striations. (X 6.) 



Hamilton group. Fall-brook, Ontario county, N. Y. 

 Fig. 9. An enlargement, showing the cell apei-tui-es very closely disposed. (X 6.) 



Hamilton group, lu the vicinity of Oeneseo, N. Y. 

 Fig. 10. A still farther enlargement, showing more distinctly the characters illustrated in the preceding 



figure. (X 18.) 

 Fig. 11. An enlargement, showing the most common appearance of the surface of a frond. (X 6.) 



Hamilton group. Near Lodi Landing, Seneca lake, N. Y. 

 Fig. 12. An enlargement of a broad frond having simple longitudinal striations. (X 6.) 



Hamilton group. Norton's Landing, Cayuga lake, N. Y. 

 Pig. 13. An enlargement, showing lunate projections from the outer margins of the peiistomes. (X 18.) 



Hamilton gioup Kashong creek, Bellona, Yates county, N. Y. 

 Fig. 14. A still farther enlargement of one cell aperture. (X tiO.) 

 Vig. 15. An enlargement, showing regularly disposed obli(jue cell apertui-ea. (X 6.) 



Vxg. 16. An enlargement, showing jirominent denticulated projections from the posterior portion of the 

 cell apertui-es. (X 18.) 



Hamilton gi-oup. Near Muttonville, North Bristol township, Ontario county, N. Y. 

 Fig. 17. A fragment, natural size. 

 Fig. 18. Enlargements of ti-ansverse sections of diflerent fronds. (X 6.) 



StICTOI'OKA PALMIPE.S. 

 Page 25S. 

 Fig. 19. A frond, natural size, showing the base and manner of growth. 



Fig. 20. An enlargement from the pi-ece<ling, showing the l)road non-celluliferous margin, the oval cell 

 aijertures, with slight peiistomes. and the nodose longitudinal ridges. (X 18.) 

 Hamilton group. Near Pavilion, N. Y. 



