144 Thirty-second Report on the State Museum. 



nearly parallel, sinuous, and marked by transverse lines of growth. Length 

 reaching fourteen mm. ; diameter at aperture from one-half to nearly one mm. 



Dr. Rominger, in his description, speaks of diaphragms and lateral pores, 

 in a form described by him, but with a careful examination of numerous speci- 

 mens and transparent sections, I have been unable to find either of these char- 

 acters in the typical species. 



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



Vermipora robusta, n. sp. 



(PLATE II, PIGS. 32, 33.) 



Corallum ramose, tubes from six to eight mm. in length, and two mm. in 

 diameter at the aperture ; diameter of branch seven mm. ; surface marked by 

 obscure transverse striae and undulations. 



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

 tively shorter cell-tubes. 



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



^Vermipora ? tortuosa, n. sp. 



(PLATE II, FIG. 23.) 



Corallum consisting of elongate cylindrical tubes, increasing by interstitial 

 additions. Length of single tube four mm. ; diameter at mouth .50 mm. ; sur- 

 face marked by numerous oblique transverse annulations which give to the tube 

 a twisted appearance. 



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



STRIATOPORA, Hall. 

 Striatopora Issa. 



PLATE III, FIGS. 14, 15.) 



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



Corallum ramose, solid ; bifurcations distant ; diameter of the branches about 

 ten mm. ; cells polygonal, arising from the centre of the branch, rapidly in- 

 creasing in size, and quite abruptly curving to the surface ; diameter of the larger 

 cells at the aperture about two mm. ; cell- walls thick, strongly striated ; mural 

 pores large, round. 



This is the most robust species of this genus yet noticed, and the cells are 

 large in proportion ; it is not a common form and is generally found in detached 

 pieces on the weathered surfaces of blocks of limestone. 



Formation and, locality. In limestones of the Lower Helderberg group, 

 Clarksville, N. Y. 



