tet ragraptus

[Pref. tetra-, and Greek graptos =written, marked with letters.] Palæont .: A genus of Graptolitide from the Skiddaw and Quebec groups (Lower Silurian). The polypary consists of four simple mono-prionidian branches, springing from a central non-celluliferous connecting proce , which bifurcates at each end. The celluliferous branches do not subdivide, and the base may be enveloped in a peculiar horny disc. †tět-ra-gyn, s. [TETRAGYNIA.] Bot .: Any individual of the Tetragynia.