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Quarterly Journal of Microscopical Science, Vol s2-83, 1-33, Copyright © 1941 by Company of Biologists

Development of the Dermal Bones in the Skull of Lepidosteus Osseus

F. J. AUMONIER M.Sc.1

1 University College, London

1. The development of the dermal elements of the skull of Lepidosteus osseus has been studied in a series of twelve stages.

2. The homologies of the three small scale-bones of the snout have been established. They are the rostral, nasals, and antorbitals.

3. The ‘maxillary chain’ is shown to be an extension of the infra-orbital series, and the existence of a true maxillary is established.

4. The extent and single origin of the premaxillary are shown, and its unusual association with the supra-orbital basal is discussed.

5. The correct homologies of the opercular series have been established, the recognition of a sub-orbital has been recorded.

6. It is shown that Stensio's complex nomenclature is redundant to a description of the dermal bones of the skull of Lepidosteus osseus.






© The Company of Biologists Ltd 1941