PLATE II—Continued. 
Aulopora elongata. 
Page 5. 
Fig-. 14. A specimen showing some variation in the mode of growth. 
Lower Helderberg group. Schoharie, N. Y. 
Figs. 19, 20. Natural size and enlargement of a stouter form, having a smoother surface and otherwise 
differing from the preceding. 
Lower Helderberg group. Schoharie, N. Y. 
CORNUL1TES MOEESTDS, 11. Sp. 
Aulopora 'l Cornulites. Report of State Geologist for 1882. Expl. pi. 2, figs. 21, 22. 1883. 
Figs. 21, 22. Natural size and enlargement of a single tube, showing a strongly corrugated surface. 
Lower Helderberg group. Clarksville, JSf. Y. 
Vermipora? tortuosa. 
Page 6. 
Fig. 2. A group of three tubes enlarged to six diameters. 
Vermipora serpuloides. 
Page 5. 
Fig. 24. A small branch, natural size, showing the bases of branchlets which have been broken off. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 25. An enlargement from fig. 24, showing the form and arrangement of the cell tubes. 
Fig. 26. A large specimen with numerous branches. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 27. A larger branch with a single bifurcation. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 28. An enlargement of a specimen showing angular cell tubes. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 29. A longitudinal section, natural size. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 30. An enlargement illustrating the characteristic mode of growth. A single tube on one side may 
be traced for nearly two-thirds the entire length of the specimen. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 31. A longitudinal translucent section, showing the mode of increase of the cells. 
Vermipora robusta. 
Page (i. 
Figs. 32, 33. Two fragments, natural size, showing the form of cell apertures and mode of growth. 
Lower Helderberg group. Clarksville and Schoharie, N. Y. 
