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Ontogeny of aquatic animals: 1, 1a+1b) Young turbots (Scophthalmus maximus) with locally changing eyes; 2) Nauplius of a shrimp, 2a) somewhat older stage of such, 2b) Penaeus; 3) Naupilus of Balanus, 3a) Balanus colony,; 4) Naupilus of Notopterophorus, 4a) male, 4b) female; 5) Naupilus of Peltogaster, 5a) Hermit crab with Peltogaster parasite; 6) Pentacrinites phase (stalked crinoid) of Antedon, 6a) Antedon; 7) Embryo of a eyed electric ray (Torpedo torpedo), 7a) Eyed electric ray; 8) Embryo of a dogfish, 8a) Dogfish. Lithograph, published in 1897.