Data on egg size, capsule size, development type, and the presence and nature of albumen are summarized for 32 species of Ascoglossa, including new data on 23 speciesfrom Florida and the Caribbean. Lower limits of egg sizes for Ascoglossa with lecithotrophic and capsular development were substantially lower than limits reported for other opisthobranchs, probably because of the use of albumen as nutrient reserves in species with extendeddevelopment. Capsule size is a more accurate predictor of development type than egg size. The use of albumen as a nutrient resourceis associated with a relatively high plasticity of development.