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The Moulting and Growth-Stages of Gammarus, with Descriptions of the Normals and Intersexes of G. cheureuxi

Published online by Cambridge University Press:  11 May 2009

E. W. Sexton
E. W. Sexton
Affiliation:
Ray Lankester Investigator for 1920.
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Extract

Many of the difficultics found in naming and classifying Crustacea are due to the extraordinary modifications caused by growth and sex, and the confusion arising from our lack of knowledge of these developmental stages has led to many errors.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 13 , Issue 2 , November 1924 , pp. 340 - 401
Copyright
Copyright © Marine Biological Association of the United Kingdom 1924

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References

* The whole cost of producing the blocks from which the plates illustrating this paper have been printed has been met in part by the author and in part by special donations given for the purpose.—Ed.

* The male usually carries the female with its second gnathopods, the claw of the right hand being inserted under the anterior edge of the tergum of the female's first peræon-segment, and the claw of the left hand under the posterior edge of the tergum of the fifth peræon-segment.

* A History of the British Sessile-eyed Crustacea, by C. Spence Bate and J. O. Westwood. Vol. I, p. 380; Vol. II, p. xlv. London, 1863, 1868.

* In these and in similar cases described in this paper the animals were examined and recorded only once in the twenty-four hours. If the exact hour of moulting had been known in each instance, it is not unlikely that there would have been less divergence between the different times recorded.

* See p. 554. Jour. Mar. Biol. Assoc., Vol. IX, No. 4, 1913.

* Journ. Mar. Biol. Assoc., Vol. XII, No. 3, p. 543, Fig. 112.

* Calman, . 1911. Life of Crustacea, pp. 22–4.CrossRefGoogle ScholarGeoffrey, Smith. 1909. Camb. Nat. Hist., Vol. IV, pp. 116 and 152.Google Scholar

* Trans. N.Z. Inst., Vol. 54, p. 242, and figure. 1923.

† Trans. N.Z. Inst., Vol. 53, p. 232. 1921.

* The specimens 12 and 23 described in a previous paper, “Intersexes in Gammarus chevreuxi,” Sexton, and Huxley, , Journ. Mar. Biol. Assoc., Vol. XII, No. 3. 1921.Google Scholar