8 
PALEONTOLOGY OF NEW YORK. 
FAVOSITES, Lamarck. 1812. 
Favosites Helderbergi^e. 
PLATE IV, FIGS. 1, 2; PLATE V, FIGS. 1-3; PLATE VI, FIGS. 1-8. 
Favosites Helclerbergicv, Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 111. 1874. 
“ “ “ Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 145. 1879. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 4, tigs. 1, 2 ; pi. 5, figs. 1-3 ; 
pi. 6, tigs. 1-8. 1S83. 
Corallum consisting of large, lenticular, depressed convex or hemispherical 
masses; base covered by a strongly wrinkled epitheca. Cell tubes polygonal; 
their inner surface showing evidence of a few strong longitudinal striae. 
Septa frequent, from ten to fifteen in the space of 10 mm.; thickness equal 
to that of the cell walls. Mural pores in one or two ranges, comparatively 
large, circular, with margins distinctly elevated. Cell walls thin, but fre¬ 
quently much thickened near the surface by silicification, and sometimes 
granulose or spinulose on the inner face. On some specimens the cells, at 
the surface, are nearly equal, having a diameter of about 1.5 mm.; on other 
specimens the diameter varies from .66 mm. to 1.5 mm. 
On many specimens some of the cell tubes are larger and less angular than 
those surrounding them, being a little more than 2 mm. in diameter. A 
single specimen from Coeymans Landing has slightly larger tubes on one por¬ 
tion, while on all the other parts the cells have the ordinary characters. 
This species differs from Favosites Niagarensis, which it resembles in the size 
of its cells, in having more numerous diaphragms, and in the mural pores being 
on the lateral laces instead of at the angles of the cells. 
Formation and localities. In the slialy limestone of the Lower Helderberg 
group, near Clarksville, Albany county. It is here found weathered out from 
the rock and silicified, frequently a foot or more in diameter. It is also found 
in several localities in Schoharie county. Smaller specimens of what appear 
to be the same or a closely allied species occur at Cole’s quarry, Herkimer 
county, N. Y. The species likewise occurs near Cumberland, Md., having the 
cells uniformly somewhat smaller than those of the New York specimens. 
