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Copepoda, an order of Crustacea. A, cyclops quiadricornis; b, c, d, stages of growth in larvae.

Copepoda

Copepoda, an order of Crustacea. A, cyclops quiadricornis; b, c, d, stages of growth in larvae.

Copepoda, an order of crustaceans. e, Calligus Mulleri, or horseshoe crab.

Crustacean

Copepoda, an order of crustaceans. e, Calligus Mulleri, or horseshoe crab.