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By the Trilobita, again, the Archicarida are connected with such Edriophthalmia as Serolis. The Stomapoda are extremely modified Edriophthalmia of the amphipod type. On the other side, the Isopoda lead to the Myriapoda, and the latter to the Insecta. The phylum of the Vertebrata is the most interesting of all, and is admirably discussed by Professor Haeckel.
He assumes that the primary stock of the whole group was a crustacean, having that Nauplius form in which Fritz Müller has shown that so many Crustacea commence their lives. All the Entomostraca arose by the modification of some one or other of these Naupliform "Archicarida." Other Archicarida underwent a further metamorphosis into a Zoaea-form.
The Copepoda, the Ostracoda, and the Branchiopoda are the Crustacea which have departed least from the embryonic or Nauplius-forms; and, of these, I imagine that the Copepoda represent the hypothetical Archicarida most closely. Apus and Sapphirina indicate the relations of these Archaeocarids with the Trilobita, and the Eurypterida connect the Trilobita and the Copepoda with the Xiphosura.
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