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Nauplius-brood. Ord. 1. Ceratometopa. Nauplius with frontal horns. Ord. 2. LEIOMETOPA. Nauplius without frontal horns. Sub-class II. HEMISCHISTA. Segmentation not complete. A. Nototropa. Embryo bent upwards. Ord. 3. Protura. The tail is first formed. Ord. 3. Saccomorpha. A maggot-like larva-skin is first formed. B. Gasterotropa. Embryo bent ventrally. Ord. 5. Zoeogona.
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