. Bulletin of the British Museum (Natural History). . Fig. 46. Diagrammatic longitudinal section of the different stages in the reduction of the gonophore : a, medusa ; B, eumedusoid ; c and d, cryptoraedusoid ; e, hetero- medusoid ; F, styloid (redrawn from Kiihn, 1913). Table III.—Degree of Reduction of the Gonophores Corymorpha nutans M. Sars . Corymorpha glacialis G. O. Sars . Corymorpha groenlandica AUman Tubiilaria indivisa L. Tubularia larynx Ellis & Solander Tubularia regalis Boeck Ectopleura dumortieri (van Beneden) Hybocodon prolifer L. Agassiz Medusa. X X X Eumedusoid. ? ? Crypt
. Bulletin of the British Museum (Natural History). . Fig. 46. Diagrammatic longitudinal section of the different stages in the reduction of the gonophore : a, medusa ; B, eumedusoid ; c and d, cryptoraedusoid ; e, hetero- medusoid ; F, styloid (redrawn from Kiihn, 1913). Table III.—Degree of Reduction of the Gonophores Corymorpha nutans M. Sars . Corymorpha glacialis G. O. Sars . Corymorpha groenlandica AUman Tubiilaria indivisa L. Tubularia larynx Ellis & Solander Tubularia regalis Boeck Ectopleura dumortieri (van Beneden) Hybocodon prolifer L. Agassiz Medusa. X X X Eumedusoid. ? ? Crypto- medusoid. Styloid. the gonophores being developed into free-swimming medusae or remaining in connection with the hydroid polyp (the trophosome) as fixed gonophores if no other structural differences imply a generic separation ". This scheme works very weU and is indeed admirable if each group of species fell naturally into one type of hydroid and one type of free medusa. There are, however, serious difficulties which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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