Abstract
Adult female mysids do not moult while carrying young in the marsupium. Successive larval stages can be recognized in the marsupium and this allows examination of the body length of the parents at different points in the inter-moult period. The body length of 13 species of mysids was found to have increased during the course of the inter-moult period; the average increase in length of the body is 7%. An examination of the ratio of abdomen length to carapace length at different points in the inter-moult period shows that this growth in length is accommodated in the abdomen.

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