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"B, ciliated planula formed by the continuance of this process. A split in the entoderm furnishes the beginning of the gastro-vascular cavity (g) of the adult." -Galloway, 1915

Hydroid Planula

"B, ciliated planula formed by the continuance of this process. A split in the entoderm furnishes the…

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or free end at which the tentacles and mouth will be developed." -Galloway, 1915

Mature Hydroid Planula

"C, more mature condition, in which the planula has become fixed: f, foot or attached end; o, oral or…