6 PALEONTOLOGY OF NEW YORK. 



Vebmipora robcsta. 



PL.ATK U, FIGS. Si, 33. 



Vtn^pora rtibiuta. Hall. Thirty-second Kept. N. Y. State Mas. Nat. Hist., p. 144. 1879. 



Rejiort of Stale Geologrist for 1882. Expl. pi. 3, figs. 32, 33. 1883. 



CoRALLU-M ramose ; diameter of branch 7 mm. Exposed portion of the cell- 

 tubes from 6 to 8 mm. in length ; diameter at the aperture 2 mm. Surface 

 marked by obscure transverse strise and undulations. 



This species differs from V. serpuloides in its much larger size and compara- 

 tively shorter cells. 



Formation and locality. Lower Helderberg group, Schoharie, N. Y. 



Vermipora? tortuosa. 



PLATE n, FIG. 23. 



Vmmiporar torlwtsa. Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 144. 1870. 

 •« " " Report of State Geologist for 1882. Expl. pi. 2, fig. 23. 1883. 



CoRALLUM consisting of an aggregation of elongate, sub-cylindrical tubes, 

 increa.sing by lateral gemmation. Length of cell tube 4 mm.; diameter 

 at the aperture .50 mm. Surface marked by numerous oblique transverse 

 annulations which give to the cell tubes a twisted appearance. 



Formation and locMlity. Lower Helderberg group, near Clarksville, N. Y. 



STRIATOPORA, Hall. 1852. 

 Striatopora Issa. 



PLATE III, FIGS. U, 115. 



Striatojxrra Issa, Hall. Twenty-sixth llept. N. Y. State Mus. Nat. Hist., p. 114. 1874. 

 " " " 'ITiirty-second Rept. N. Y. State Mus. Nat. Hist., p. 144 1879. 



Report of State Geologist for 1882. Expl. pi. 3. figs. 14, 15. 1883. 



CoRALLUM ramose; diameter of the branches reaching 10 mm.; composed of 

 thick-walled, tubular cells, arising from the center of the branch, rapidly 

 increasing in size and quite abruptly curving to the surface ; cell tubes 

 polygonal, from four to six-sided ; unequal in size through the frequent inter- 

 calation of young cells ; diameter at the surface from 1 to 2 mm. ; interior 



