Most planktonic marine copepods have nauplii which differ greatly from the copepodids so that it is difficult to relate them to the adult form. Rearing experiments are usually unsuccessful; only 8% of ca. 800 species of planktonic marine copepods have identified nauplii (see below cited list). To this 8% the following species are added in this work: Acartia lilljeborgi, Calocalanus styliremis, C. pavo, Candacia sp., Clausocalanus furcatus, Centropages furcatus, Corycaeus amazonicus, C. giesbrechti, C. speciosus, Farranula gracilis, Labidocera fluviatilis, Microsetella rosea, Oithona oculata, O. ovalis, O. plumifera, O. simplex, Oncaea media, O. venusta, Paracalanus crassirostris, Pontellopsis sp., Pseudodiaptomus acutus. They were reared from the egg to the first nauplius, or from the last nauplius to the first copepodid either at the Caraïbisch Marien-Biologisch Instituut (= Carmabi), Curaçao, during 1963, or at the marine station of the Instituto Oceanográfico, Ubatuba, Brazil, during 1966—1967. Methods used have been described previously (BJÖRNBERG, 1965a, 1966, 1967). Other methods have often been used by other workers (BERNARD, 1963, 1965a, b; BRESCIANI, 1960; CONOVER, 1965, 1966; CORKETT, 1966, 1967; CORKETT & URRY, 1968; FRASER, 1936; HAQ, 1965a, b; JACOBS, 1961; JOHNSON & OLSON 1948; KOGA, 1960; LEBOUR, 1918; MATTHEWS, 1964, 1966; MCLAREN, 1966; MURPHY, 1923; MULLIN & BROOKS, 1967; NEUNES & PONGOLINI, 1965; NICHOLLS, 1933; PROVASOLI et al., 1959; ZILLIOUX & WILSON, 1966).