Archive image from page 21 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 14 HYDROIDA II rings varies even within a single large colony to such a degree that the features in question cannot be taken as distinctive specific characters, unless combined with others more sound. There remains then the creeping form of colony. But Lafoea fruticosa here differs in no wise from the remaining species of the genus; its colonies may be pure upright rhizocaulome formations, but this is very rarely the case. Generally, the somewhat larger colonies
Archive image from page 21 of The Danish Ingolf-Expedition (1918). The Danish Ingolf-Expedition danishingolfexpe0507ingo Year: 1918 14 HYDROIDA II rings varies even within a single large colony to such a degree that the features in question cannot be taken as distinctive specific characters, unless combined with others more sound. There remains then the creeping form of colony. But Lafoea fruticosa here differs in no wise from the remaining species of the genus; its colonies may be pure upright rhizocaulome formations, but this is very rarely the case. Generally, the somewhat larger colonies consist partly of upright, partly of creeping por- tions, and it is very common to meet with such composite colonies, when they are brought up with the underlayer attached. Exclusively creeping colonies thus merely form the other extreme in the b oo i Fig. III. The distribution of Lafoea fruticosa forma genuina • and forma grandis -\- in the northern Atlantic. The hatched region denotes a common occurrence of Lafoea fruticosa according to literature. (In British waters the dates are to be revised owing to confusion of the species with Lafoea gracillimd). same series of variants. Consequently therefore, Lafoea pocillum must be discarded, as being synony- mous with Lafoea fruticosa. Jaderholm (1909 p. 71) follows, stating no particular reason, the example of Nutting (1901 p. 175) and ascribes Lafoea pocillum to the genus Hebella. Nutting, in his diagnosis of this genus, states as follows: 'Hydrotheca? . . . having their cavities separated from those of the stem by a partial septum'. Such septum or diaphragm is altogether lacking in the European specimens of Lafoea pocillum. It must not be forgotten, however, that the former species partly owe their existence to external determining factors. Disregarding the creeping form of colony as opposed to the upright, the differ- ences presented by the colonies in a less extensive material are considerable enough to warrant at any rat
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