The Structure of Oncograptus T. S. Hall

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Abstract
The genus Oncograptus was founded by T. S. Hall (1914, p. 109) with the species Oncograptus upsilon T. S. Hall as type. The original definition reads: “Hydrosome at first biserial, but later dividing into two uniserial branches. Thecae long, narrow, and slightly curved. The form of the genus is quite different from that of any other graptolite. The form of the thecae and the great width of the branches seem to remove it from the Dicranograptidae.” In the same description Hall remarks upon the resemblance of the thecae to those of Isograptus (Didymograptus) caduceus, and observes that concrescence of the branches of D. caduceus would result in the formation of a rhabdosome “somewhat similar” to Oncograptus.

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