100 PALEONTOLOGY OF NEW YORK. 



SCALAR IPO 11 A, Hall. 1881. 



SCALARIPORA SCALARIFORMIS. 



PLATE XXIX, FIGS. 4-8. 



Sralaripara scalar^formis. Hall. Ti-jins. Albany Iiistilute, vol. x, abstract, p. 18. 1881. 



•' " " Report of State Geolojjist for 188.5, advance sheets. Exjil. pi. 2tt, figs. 



4-S. 1886. 



ZoARiUM composed of an irregular group of triangular prismatic branches ; faces 

 of the branch equal, width from 3.50 to 4 mm., very concave, the concavity 

 along the middle sub-angular ; traversed transversely, at intervals of about 

 1.50 mm., by very thin, celluliferous scalaB, having a height at the middle of 

 the branch of about 1 mm., thickness .20 mm. Cells tubular, arising from 

 the radiating mesotheca and from the mesotheca of the scaloe, the latter being 

 very oblique, and nearly parallel with the surface. Cell apertures circular, 

 sometimes papillose, diameter about .24 mm. ; irregularly disposed, frequently 

 in contact: peristomes strong, sometimes equally elevated, at other times 

 the posterior margin is the most elevated. Intercellular space irregularly 

 vesiculose. 



This species differs from S. subconcava in its larger branches, the deeper con- 

 cavity of the sides, and the comparatively more frequent bifurcations. 

 Formation and locality. Upper Helderberg group, Falls of the Ohio river. 



SCALARIPORA SUBCONCAVA. 



PLATE XXIX, FIGS. 1-3. 



Sealaripora subcoTicava, Hali,. Trans. Albany Institute, vol. x, abstract, p. 18. 1881. 



" " " Report of State Geologist for 18S5, advance sheets. Expl. pi. 29, figs. 1-3. 



1886. 



ZoARiOM composed of triangular branches ; sides equal or sub-equal, width from 

 1 50 to 2 mm., slightly concave; scalae occurring at intervals of about 1.30 

 mm., height .50 mm., thickness .25 mm. Cell apertures nearly circular, 

 diameter about .18 mm; irregularly disposed. Peristomes thin, equally or 

 unequally elevated. Intercellular space vesiculose. 



