. Danmarks fauna; illustrerede haandbøger over den danske 98 Hydroidernes Inddeling i Slægter, og nogle Forfattere benytter endnu i Hovedsagen dette Princip. Her følges det af Levinsen angivne Princip, hvorefter der i nordiske Farvande kun findes nedenstaaende to Slægter:. 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 Dansk naturhistorisk forening. København, G. E. C. Gad

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Keywords: ., bookauthordansknat, bookcentury1900, bookdecade1900, bookyear1907