Fig. 34—Early Nauplius Larva of a Copepod (Cyclops). Much enlarged. (From Lankester's "Treatise on Zoology.")
a′, Antennule; a″, antenna; gn, jaw-spine of antenna; lbr, upper lip; md, mandible
Most of the Copepoda also leave the egg in the nauplius stage; and, indeed, it was to the young of the common fresh-water Cyclops ([Fig. 34)] that the name of Nauplius was first given by the Danish naturalist, O. F. Müller, in the eighteenth century, in the belief that it was an adult and independent species of Crustacea. In the Copepoda, the changes which transform the nauplius into the adult are gradual, and consist chiefly in the successive addition of new somites and appendages.
Fig. 35—Larval Stages of the Common Rock Barnacle (Balanus balanoides—see [Plate III].)
A, Nauplius stage (after Hoek); B, cypris stage (after Spence Bate)
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