Note on the larva and the postlarval development of Leucosolenia variabilis , H. sp., with remarks on the development of other asconidæ

Through the kind hospitality of Professor de Lacaze-Duthiers, I was able to spend the spring and summer of last year at the marine laboratories of Banyuls-sur-Mer and Roscoff, where I was chiefly engaged in studying the embryology of the Ascons.