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.