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Preliminary Account of a Contribution to an Evaluation of the Sea

Published online by Cambridge University Press:  11 May 2009

J. H. Orton
J. H. Orton
Affiliation:
Naturalist at the Plymouth Laboratory.
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Extract

An investigation of the rate of growth in Marine Invertebrates was begun in 1911, and a large amount of material the age of which is known has now been collected from various sources. The particular objects of this research are: (1) to establish the age of common marine invertebrates, (2) to determine the minimum age at which these forms begin to breed, (3) to examine the rate of growth at different seasons of the year and under different conditions, (4) to investigate the fecundity of different forms so far as possible, and (5) to collect the scattered literature on these subjects.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 10 , Issue 2 , June 1914 , pp. 312 - 326
Copyright
Copyright © Marine Biological Association of the United Kingdom 1914

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References

* More exact measurements will be given later.

* Including Bugula calathus, Norman, for the purpose of the present paper.

* Russell, E. S., “The Growth of the Shell of Patella vulgata,” Proc. Zool. Soc, 1909, p. 235,Google Scholar I.

* Orton, J. H., “On the Occurrence of Protandric Hermaphroditism in Crepidula fornicata,” Proc. Roy. Soc. B., Vol. 81, 1909.CrossRefGoogle Scholar

The meaning of the abbreviations used above is as follows:—

p.sm.=penis small; p.tr.=trace of penis; p.r.=penis rudimentary.

ut.sm.=uterus small; ut.r.=uterus rudimentary.

* As has been found by the writer in researches in this group.

* Development in this species is remarkably rapid; the fertilized egg developing into a metamorphosing larva in less than 24 hours.

* A. Weismann, Essays upon Heredity, Vol. 1, p. 57. Edited by E. B. Poulton, S. Schönland, and A. E. Shipley. Oxford, 1891