CORALS AND BRYOZOA. 257 



Stictopora granifera. 



PLATE LXI, FIGS. l-«. 



stictopora granifera. Hall. Trans. Albany Institute, vol. x, p. 191. 1881. 

 *• " " Report of State Geologist for 1883, p. 4.'). 1884. 



ZoARiUM consisting of a flattened, dichotomously branched frond. Branches 

 above a bifurcation 2.50 to 3 mm. in width, increasing to 4 or 5 mm. ; on 

 some of the fronds there are slight contractions in the branch at frequent 

 intervals ; transverse section flattened-lenticular, greatest thickness observed 

 about .40 mm.; non-celluliferous marginal space very narrow. Cells tubular, 

 length about 1.50 mm., for the greater portion of their length nearly 

 parallel with the mesotheca, then turning abruptly and opening directly out- 

 ward Inter-cellular space occupied by irregularly disposed vesicles. Cell 

 apertures oval, length about 33 mm., width a little more than one-half the 

 length ; closely and irregularly disposed, frequently in contact, never distant 

 more than the width of an aperture. Peristomes strong, equally elevated, 

 and having eight to ten minute nodes or granules. On the non-celluliferous 

 margin, cand on the surface between the cell apertures there are compara- 

 tively frequent, interrupted, longitudinal, granulose striations of about the 

 same thickness and height as the peristomes. When the frond is well pre- 

 served the striations and peristomes are so similar in appearance that it is 



often very difficult to distinguish the limits of the cell apertures. 



********* 



Formation and localities. Hamilton group, near Pavilion village, Genesee 

 county, and Muttonville, North Bristol township, Ontario county, N. Y. 



Stictopora divergens, n. sp. 



PLATE LXni, FIGS. 18, 19. 



ZoARiDM consisting of a flattened dichotomously branched frond, arising from a 

 spreading base, or from several rootlets attached to foreign bodies ; some of 

 the fronds are a little sinuous in their manner of growth. Branches from 1.50 

 to 2 mm. in width ; margins slightly divergent, expanding but little before 

 bifurcation ; non-celluliferous marginal space extremely narrow or obsolete ; 



