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The Crabs and Macrurous Crustacea, the Stomapoda, the Diastylidae, the Amphipoda and Isopoda, the Ostracoda and Daphnidae, the Copepoda and Parasita, the Cirripedes and Rhizocephala of our coast, representing the class of Crustacea with the deficiency only of the Phyllopoda and Xiphosura, furnished a long and varied, and at the same time intimately connected series, such as was at my command in no other class.
How well warranted are we therefore in identifying the latter with the former. Equally scanty is our knowledge of the developmental history of the Ostracoda. The development of Cypris has recently been observed by Claus: "The youngest stages are shell-bearing Nauplius-forms." The section of the Branchiopoda includes two groups differing even in their development, the Phyllopoda and the Cladocera.
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