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A Note on the Formation of the Egg Case of the Skate

Published online by Cambridge University Press:  16 October 2009

A. D. Hobson
A. D. Hobson
Affiliation:
Lecturer in Experimental Zoology, University of Edinburgh.
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Extract

There seems to be some uncertainty about the exact stage at which the horny case is secreted around the fertilised Elasmobranch egg. Those textbooks which have been consulted either pass over the matter in silence or give the impression that the shell is secreted while the egg is passing through the nidamental organ. Sedgwick (1905), for example, says (p. 143): “The shell is formed round the ovum and its albumen in the lower dilated part of the oviduct, but the material of which it is composed is secreted by the oviducal gland.” Of late years the question seems to have received little attention, but there are several papers on the subject published twenty or more years ago.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 16 , Issue 2 , March 1930 , pp. 577 - 581
Copyright
Copyright © Marine Biological Association of the United Kingdom 1930

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References

REFERENCES

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Ihle, J. W. E.Vergleichende Anatomie der Wirbeltiere. Berlin, 1927.Google Scholar
Lamont, A.Relative frequency of species and sex-ratios in the skates and rays (genus Raia). Proc. Roy. Physical Soc., Edinburgh, Vol. 21, 1926.Google Scholar
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