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"A. A small piece of hydroid colony. p., Perisarc; m., medusoid bud; h., hydranth or polyp head." -Thomson, 1916

Hydroid Colony

"A. A small piece of hydroid colony. p., Perisarc; m., medusoid bud; h., hydranth or polyp head." -Thomson,…

"Campanularian Hydroid. H., Hydrotheca or polyp-cup; HY., hydranth, or polyp-head; G., gonotheca, enclosing a reproductive polyp producing medusoid buds; M., a liberated medusoid; ST., basal stolon." -Thomson, 1916

Campanularian Hydroid

"Campanularian Hydroid. H., Hydrotheca or polyp-cup; HY., hydranth, or polyp-head; G., gonotheca, enclosing…

"Diagram showing possible modifications of persons of a gymnoblastic Hydromedusa. a, hydrocaulus (stem); b, hydrohiza (root); c, enteric cavity; d, endoderm; e, ectoderm; f, perisarc (horny case); g, hydranth (hydriform person) expanded; g', hydranth (hydriform person) contracted; h, hypostome, bearing mouth at its extremity; k, sacciform gonophor (sporosac) springing from the hydrocaulus; k', sporosac springing from m, a modified hydriform person (blastostyle): the genitalia are seen surrounding the spadix or manubrium; l, medusiform person or medusa; m, blastostyle." — Encyclopedia Britannica, 1893

Hydromedusa

"Diagram showing possible modifications of persons of a gymnoblastic Hydromedusa. a, hydrocaulus (stem);…

"Diagram showing possible modifications of the persons of a Calyptoblastic Hydromedusa. a, hydrocaulus (stem); b, hydrohiza (root); c, enteric cavity; d, endoderm; e, ectoderm; f, perisarc (horny case); g, hydranth (hydriform person) expanded; h, hypostome, bearing mouth at its extremity; i, the horny cup or hydrotheca of the hydriform persons; l, medusiform person springing from n, a modified hydriform person (blastostyle); n, the norny case or gonandium enclosing the blastostyle and its buds. This and the hydrotheca i give origin to the name Calyptoblastea." — Encyclopedia Britannica, 1893

Hydromedusa

"Diagram showing possible modifications of the persons of a Calyptoblastic Hydromedusa. a, hydrocaulus…