146 Thirty-second Report on the State Museum. 



Formation and localities. In the shaly limestones of the Lower Helderberg 

 group, near Clarksville, Albany county It is here found weathered out from 

 the rock and silicified, frequently in masses of a foot or more in diameter. It 

 is also found in several localities in Schoharie county. Smaller specimens of 

 what appears to be the same or a closely allied form occur at Cole's quarry, 

 Herkimer county, N. Y. The species likewise occurs near Cumberland, Md., 

 having the cells somewhat smaller than those of New York specimens. 



Favosites conica, Hall. 



(PLATE III, FIGS. 4, 6, 13.) 



Favosites conica, Hall. Twenty-sixth Rep. N. Y. State Mus. Nat. Hist., p. 112. 1874. 



Corallum forming conical masses; flattened at the base, which is covered with 

 a strongly wrinkled epitheca. Cells arising from the centre of the base, quite 

 abruptly curving to the surface, increasing by interstitial additions ; polygonal; 

 from four to eight-sided, variable in size, the larger ones being three mm. in 

 diameter ; dividing walls thin ; mural-pores comparatively large, circular, with 

 distinctly raised margins, in one, two and sometimes three ranges ; where two 

 ranges occur, the pores alternate with each other ; where more than two ranges 

 occur, the arrangement of the pores is more irregular; transverse partitions closely 

 arranged, two or three in a distance equal to the diameter of a tube. 



The conical form of this species, and the inequality of the cells, distinguish 

 it from every other known Favosites of the New York formations. The speci- 

 mens are usually from one inch to three inches in diameter. 



Formation and locality. In the shaly limestones of the Lower Helderberg 

 group, near Clarksville, N. Y. 



Favosites in expect ans. 



(PLATE IX, FIGS. 16, 17.) 



ChcBtetes Helderbergi.ee, Hall. Twenty-sixth Rep. N.Y. St. Mus. Nat. Hist, p. 110. 1874. 

 Not Favosites Helderbergia-, Hall. Twenty-sixth Rep. N. Y. State Mus. Nat. Hist., 



p. 111. 1S74. 



Corallum ramose ; diameter of branches, ten mm. ; cell-tubes polygonal, very 

 long and slender, rising from the centre of the branch and gradually curving to 

 the surface; diameter of the cell-apertures from .50-. 65 mm.; transverse par- 

 titions very thin ; mural-pores large, one or two series on each face of the tube 

 walls, which have numerous oblique corrugations. 



Formation a>-d localities. In the shaly limestone of the Lower Helderberg 

 group, at Catskill creek, near Clarksville, and at Schoharie, N. Y. 



Favosites sph^ricus. 



Choctetes spTiczrica, Hall. Twenty-sixth Rep. N. Y. State Museum Nat. Hist., 



p. 113. 1874. 



Corallum forming globose or depressed-globose bodies, composed of minute, 

 radiating cells, about .35 mm. in diameter, having comparatively thick walls, 



