CORALS AND BRYOZOA. 
269 
This species is very characteristic and can be easily distinguished from any 
other at present known, in this horizon, by the peculiar manner of growth. 
A fragment of a branch, where the base is not preserved, somewhat resembles. 
Stictopora subcarinata, but the branches are wider, the ridges separating the rows 
of apertures are stronger, the central ridge is much more conspicuous, the 
marginal cell apertures are smaller and the marginal non-celluliferous space is 
narrower. 
Formation and localities. Hamilton group, Black Point, Canandaigua lake; 
Bellona, Yates county ; Lodi Landing, Seneca Lake, and Darien Centre, Genesee 
county, N. Y. 
Stictoporina, nov. sub. gen. 
Stictopora (Stictoporina) claviformis. 
NOT FIGURED. 
•Trematopora claviformis, Hall. Trans. Albany Institute, vol x, p. 181. 1S81. 
“ “ “ Report of State Geologist for 18S3, p. 12. 1884. 
Zoarium consisting of an erect frond of 8 to 10 mm. in height; base obtusely 
pointed, and for a short distance above the frond is cylindrical, diameter about 
.80 mm., gradually enlarging and becoming flattened ; width above a bifurca¬ 
tion a little more than 1 mm., increasing to 2 mm.; no non-celluliferous 
marginal space ; transverse section broadly lenticular or flattened oval, greatest 
thickness observed about .80 mm. The first bifurcation occurs at 5 mm. 
above the base, the others at intervals of 3 mm.; on the specimens observed 
there are not more than three bifurcations, and this number occurs on one 
specimen only. Cells tubular, arising obliquely from a mesotlieca. Cell aper¬ 
tures oval, length about .25 mm., width two-thirds the length, disposed in 
more or less regular oblique transverse rows, at an angle of about forty-five 
degrees to the axis of the branch, separated by about one-third the width 
of an aperture. Peristomes obsolete. Interapertural space elevated, angu- 
lated, enclosing the apertures in a rhomboidal or polygonal area. The crest 
of the elevation is marked by a row of very minute granules and at the 
angles by a more prominent node. 
