. Annual report. New York State Museum; Science; Science. 204 NEW YORK STATE MUSEUM. He adds that "one specimen occurs in the collection from the Niagara shale, Hamilton, ; The latter is a beautifully preserved specimen, retaining the thecal tubes in a pyritized condition. We reproduce here [pi. 3] a drawing of the type from a photograph and camera enlargements of parts of the Ontario specimen to show its characters in detail. The mar- gins of the branches are distinctly smooth, only in one place a few thecae are seen [see fig. 107]. They are nar- row and so appressed to the
. Annual report. New York State Museum; Science; Science. 204 NEW YORK STATE MUSEUM. He adds that "one specimen occurs in the collection from the Niagara shale, Hamilton, ; The latter is a beautifully preserved specimen, retaining the thecal tubes in a pyritized condition. We reproduce here [pi. 3] a drawing of the type from a photograph and camera enlargements of parts of the Ontario specimen to show its characters in detail. The mar- gins of the branches are distinctly smooth, only in one place a few thecae are seen [see fig. 107]. They are nar- row and so appressed to the branch jj* that they hardly project. For this reason we do not believe that this form can be considered as congeneric with I. plumulosus and that Inocaulis 106 mj is the proper receptacle for it, although Fie. 105-7 Pal ae o diet yot\ bella (Hall & Whit- i ,1 ? r .1 1 i j ,i field). Natural size drawing and enlargements (x 5) of Dy tile Width OI the branches aild their fragments of a specimen from tl>« Niagaran of Hamil- ton-0nt- composition of many fine tubular thecae its close relation tc that genus is indicated. We place it, for the present, with Palaeodictyota. Palaeodictyota bella (Hall & Whitfield) mut. recta nov. Plate 6, figure 0 ; plate 7, figure 6 The shale adjoining the Clinton iron ore contains rhabdosomes of a form which appears to be so little different from P . bella — at least with the incomplete material at present available of both forms — that we pre- fer to designate it as but mutationally different from the Rochester shale type of P . bella. Its dimensions, notably the thickness of the branches are the same as in P. bella, but its habitus is a little more erect or less scraggy, owing to slightly smaller angles of divergence of the bifurcating branches and somewhat greater intervals of bifurcation. THAMNOGRAPTUS Hall The genus Thamnograptus, erected in 1859 [P^- N. Y. v. 3] by Hall for two forms of the Normanskill shale, has ever since rem
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