by the free Copepoda, are in this case completely over-leapt.

A final and very peculiar section of the Crustacea is formed by the two
orders of the Cirripedia and Rhizocephala.* (* The most various opinions
prevail as to the position of the Cirripedia. Some ascribe to them a
very subordinate position among the Copepoda; as Milne-Edwards (1852).
In direct opposition to this notion of his father's, Alph. Milne-Edwards
places them (as Basinotes) opposite to all the other Crustacea
(Eleutheronotes). Darwin regards them as forming a peculiar sub-class
equivalent to the Podophthalma, Edriophthalma, etc. This appears to me
to be most convenient. I would not combine the Rhizocephala with the
Cirripedia, as Liljeborg has done, but place them in opposition as
equivalent, like the Amphipoda and Isopoda. The near relationship of the
Cirripedia to the Ostracoda is also spoken of, but the similarity of the
so-called "Cypris-like larvae," or Cirriped-pupae as Darwin calls them,
to Cypris is so purely external, even as regards the shell, that the
relationship appears to me to be scarcely greater than that of
Peltogaster socialis (Figure 59) with the family of the sausages.)

In these also the brood bursts out in the Nauplius-form, and speedily
strips off its earliest larva-skin which is distinguished by no
peculiarities worth noticing. Here also we find again the same pyriform
shape of the unsegmented body, the same number and structure of the
feet, the same position of the median eye (which, however, is wanting in
Sacculina purpurea, and according to Darwin in some species of Lepas),
and the same position of the "buccal hood," as in the Nauplii of the
Prawns and Copepoda. From the latter the Nauplii of the Cirripedia and
Rhizocephala are distinguished by the possession of a dorsal shield or
carapace, which sometimes (Sacculina purpurea) projects far beyond the
body all round; and they are distinguished not only from other Nauplii,