Polyzoary forming a flattened expansion of unknown but apparently considerable size. Branches almost perfectly straight, bifurcating at intervals of from one quarter of an inch to one inch, nearly parallel, united by straight transverse dissepiments, sub-angular or obtusely carinated, and closely striated on the non-cefiuliferous side. About four branches in the space of three lines; measured across the frond. Dissepiments about equalling the branches in diameter, usually placed at intervale of from one line to one-tenth of an inch apart. Fenestrules oblong, rectangular, nearly equal, from one line to one-tenth of an inch in length by two-thirds of a line in width; nine fenestrules in one inch measured vertically, twelve in the same space toeasured diagonally. The fenestrules of contiguous rows nearly, but not quite, at the same level. Celluliferous face unknown.