p. 3

Polypora incepta Hall. Pal. of N.Y. vol 2 p 167 pl 402 fig 5.

Frond expanded, flabellate, originally cyathiform or funnel shaped; branches dividing somewhat regularly, sometimes anastomosing; transverse bars arranged at regular intervals, slender, scarcely thickened at their junction with the branches; fenestrules oblong quadrangular, scarcely oval; non-poriferous face with the branches regularly striated longitudinally, the stria extending into and running in the same direction as the transverse bars; celluliferous side with the branches rounded and marked by three or four rows of cells; cells oval alternating; transverse bars thinner than on the non-poriferous