Graptolithina

sill[illegible] 14 p129

Graptolithiana= as arranged by Dr. H. B. Geinitz

1st Diplograptus — With 2 series of cells
separeated by a solid axis

2d. Nereograptus—Two series of cells without
an axis in the outer of the common canal.

3d Cladograptus—Forked, or with two
arms—[R] G. [illegible] Hall

4—Monograptus—with one series of cells
and a solid axis

5 Retiolites—Two series of cells
covered with a fine reticulated membrane,
forming a middle axis on one side of
the common canal.