PLATE U— Continaed. 



AULOPORA ELONGATA. 

 Page S. 

 Fig. 14. A snecimen showing some variation in the mode of growth. 



Lower Helderberg group. Sr}u)harie, N. Y. 

 Pigs. 19, 20. Natural size ami enlargement of a stouter form, having a smoother surface and otherwise 

 " ■"' ' differing from the preceding. 



Lower Helderberg group. Schoharie, N. T. 



COUNULITES MODESTUS, 11. sp. 



Aulopora? Cornulites. Report of State (xeologist for 1882. Expl. pi. 2, figs. 21, 22. 1883. 

 Figs. 21, 22. Natural size and enlargement of a single tul>e, showing a strongly corrugated auT^^^.~ , ., 

 ••iftrf inidt «'.(iil« . Lower Helderberg group. Clarksville, N. Y. , , ,,^^ ,., '^j-,, 



VERMrPORA ? TORTUOSA. 

 Page 6. 

 Fig. 2. A group of three tubes enlarged to six diametei-s. 



Vermipora sekpuloides. 



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 fi-om fig. 24, .showing the form and arrangement of the cell tubes. 

 Fig. sit). A large specimen with numerous branches. 



Lower Helderberg gi-oup. Schoharie, iV". Y. 

 Fig. 27. A larger branch with a single bifui-cation. 



Lower Heldei'berg group. Schoharie, N. Y. 

 Fig. 28. An enlargement of a specimen showing angular cell tubes. 



Lower Helderlierg group. Clarksville, N. Y. 

 Fig. 29. A longitudinal section, natural size. 



Lower Helderberg group. Clarksville, N. Y. 

 Fig. 30. An eiJargement illuHli-ating the characteristic mode of growth. A single tube on one side may 

 be traced f(ir nearly two-thirds the entire length of the specimen. 



Lower Helderberg group. Svhoharii:, iV. Y. 

 Fig. 81. A longitudinal translucent section, showing the mode of increase of the cells. 



Vekhipoua bobusta. 



'■- ..ii.j .,,.. i,,,ii i,|- Page ». {■■■ ■''■i ,Vl 



Figs. 32, 33. Two fragments, natural size, shoNving the form of cell ajjertures and mode of gwwth. 

 Lower Helderb«<rg group. Clarksville and Scholiarie, N. Y. 



