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The Structure of Oncograptus T. S. Hall

Published online by Cambridge University Press:  01 May 2009

O. M. B. Bulman
O. M. B. Bulman
Affiliation:
Sedgwick Museum, Cambridge
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Extract

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.

Type
Original Articles
Information
Geological Magazine , Volume 73 , Issue 6 , June 1936 , pp. 271 - 278
Copyright
Copyright © Cambridge University Press 1936

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References

REFERENCES

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