Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 CRUSTACEA. 223 they pass through a free-swimming nauplius stage, then attach themselves to a fish, after which the retrogression cat FIG. 50.—A Copepod (Cyclops). From Hertwig. sets in. It is noticeable that the female becomes much more degenerate than the male.

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