p. 2

Fenestella elegans, Hall, Pal. of NY. vol. 2 p. 164 pl. 40 D. fig. 1.

Frond exanded or cup-shaped (often quite large); branches slender, frequently bifurcating; disseminents thin and slender , scarcely enlarging at the junctions with the branches; fenestrules on the non-celluliferous side oblong quadrangular, rarely oval, branches striated by two or three fine grooves which are scarcely visible; celluliferous side of branches with a thin low-edge margined on each side by a row of small oval cells about four or five to each fenestrule; cells ith the longitudinal diameter oblique to the direction of the branches: sometimes the edge of the branch is grooved longitudinally between the rows of pores - Fenestrules about seven in the space of three lines