PLATE XIV. 



LiCHENALIA MACULOSA. 

 Page 30. 

 Pig. 1. An irregularly laminated ma-ssive form of the species. 



Lower Helderberg group. C'larksviUe, N. T. 

 Pig. 2. A. conical form, presenting maculsE fi-ee from cells, and with the epitheca exposed at the base, 

 from weathering. 



Lower Helderberg group Near Catskill, N. T. 

 Fig. 3. A vertical section, enlarged, showing the tubes and intei-cellular spaces. 



Lower Helderberg group. Sc?u>harie, N. T. 

 Pigs. 4-6. Surfaces, showing vai-ious phases of the arrangement and expression of the cell apertures. 



Lower Helderberg gi-oup. Albany and /Schoharie countien, N. Y. 

 Fig. 7. The tubes cut transversely, as seen in a translucent section. 



Fig. 8. An enlargement from the surface of specimen fig. 1, showing the cell apertures and the repent 

 position of the cell tubes. 



Lower Helderberg group. ClarkwilU, N. T. 



FlSTULIPORA PONDEROSA. 



Page 27. 



See Plate 23 a. 

 Fig. 9. A massive form, natural size. 



Lower Helderberg group. Schoharie, N. F. 

 FHg. 10. A vertical section of a portion of the preceding, showing the cell tubes. 



Fig. 11. An enlargement from the surface of the specimen fig. 9, showing the characters of the cell aper- 

 tures and the interapertural spaces. 

 Fig. 12. A portion of the sui-face of a specimen, which has been worn or partially exfoliated, showing the 

 form of the cellules and the character of the intercellular spaces. 

 Lower Helderberg g^roup. Near Catskill, N. T. 



FiSTCLIPORA PARASITICA. 

 Page 28. 

 See Plate 23. 

 Rg. 13. A specimen, natural size, growing on the frond of a Fenestella. 



Lower Helderberg group. Near Catxkill, N. Y. 

 Fig. 14. An enlargement of the preceding, showing the character of the cell apertures and interaper- 

 tural spaces. 



FiSTULIPORA, Sp. ? 



Fig. 15. A branching fragment of Monotrypa overgrown with a species of Fistulipora. 

 Fig. 16. An enlargement from the surface of the preceding. 



Fig. 17. A longitudinal section of the same, enlarged, showing the thin crust of Fistulipora. This speci- 

 men is introduced on this plate in error. 



Hudson River group. Cincinnati, Ohio. 



Callopora (Ccelocaulis) mediopora. 



Page 23. 

 See Plate 23 A. 

 Fig. 18. An enlargement from the surface of a specimen, showing the cell apertures and interapertural 

 pits of nearly equal size. 



