PLATE LVII. 
Fistulipora uniline a. 
Page 217. 
Fig. 1. An enlargement of a transverse section of the cell tubes, and intercellular vesicles. (X 18.) 
Fig. 2. An enlargement of a transverse section, showing the form and disposition of the cell tubes, inter¬ 
cellular vesicles and one of the sterile maculae. (X 6.) 
Fig. 5. An enlargement of a vertical section, showing the form and manner of growth of the cell tubes and 
intercellular vesicles. (X 6.) 
Hamilton group. Near York, Livingston county, N. Y. 
Fistulipora sfheroidea. 
Page 225. 
Fig. 3. An enlargement, showing more distinctly the characters illustrated in fig. 4. (X 18.) 
Fig. 4. An enlargement, showing the form and disposition of the cell apertures, and mesopores. (X 6.) 
Hamilton group. York, Livingston county, N. Y. 
Ceramopora? (Lichenalia) foliacea. 
Page 235. 
Fig. 0. An enlargement, showing the form and disposition of the cell apertures, and one of the maculae 
destitute of apertures. (X 6.) 
Fig. 7. A still farther enlargement, showing more distinctly the form of the cell apertures. (X 18.) 
Hamilton group. Western New York. 
Fistulipora heaiispherica. 
Page 226. 
Fig. 8. An enlargement, showing the form and disposition of the cell apertures, and interapertural pits. 
(X 6.) 
Fig. 9. An enlargement, showing broadly oval or circular cell apertures, with strong peristomes, and 
elongate interapertural pits. (X 18.) 
Fig. 10. An enlargement, showing subtrilobate cell apertures, and the interapertural pits obsolete on a 
large portion of the surface. (X 18.) 
Fig. 11. An enlargement of a vertical section, showing the form and manner of growth of the cell tubes 
and the form and disposition of the intercellular vesicles. (X 6.) 
Hamilton group. Near York, Livingston county, N. Y. 
Lichenalia bull at a. 
Page 205. 
Fig. 12. An enlargement, showing very small cell apertures and large interapertural bullse. (X 18.) 
Fig. 13. An enlargement, showing cell apertures of normal size, their form and disposition, and the inter¬ 
apertural bullas. (X 18.) 
Hamilton group. Near York, Livingston county, N. F. 
