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Definitions of Graptolite
One of numerous species of slender and delicate fossils, of the genus Graptolites and allied genera, found in the Silurian rocks. They belong to an extinct group (Graptolithina) supposed to be hydroids. Webster Dictionary DB
A fossil zoophyte, with its cells arranged on one or both sides of a slender central stem. Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914.
grap'to-l[=i]t, n. one of a group of fossil hydrozoa, having simple or branched polyparies, usually strengthened by a horny-like rod--the 'solid axis.' [Gr. graptos--graphein, to write, lithos, a stone.] gutenberg.org/ebooks/37683
[Gr.] Now, fossil zoophytes-Silurian-resembling the seapens of our own seas. Glossary of terms and phrases - Percy
[Gr.] With Linnaeus, appearances on stone, as of drawings, maps, vegetable forms. Glossary of terms and phrases - Percy