. Contributions to Canadian biology. Marine biology; Natural history. 148 depahtment of tbe i^atal service great contraction and extension, hence the body or the tentacles may be long and slender or short and stout. Gonosome. Sporosacs borne on special generative zooids, usually smaller than the nutritive, without tentacles or mouth; miale and female zooids in different colonies. Other zooids. Defensive zooids are present, long, slender, often doubled; on themselves to form spirals, without tentacles^but, well supplied with batteries of nematocysts. Sensory zooids, longer even then the defensi
. Contributions to Canadian biology. Marine biology; Natural history. 148 depahtment of tbe i^atal service great contraction and extension, hence the body or the tentacles may be long and slender or short and stout. Gonosome. Sporosacs borne on special generative zooids, usually smaller than the nutritive, without tentacles or mouth; miale and female zooids in different colonies. Other zooids. Defensive zooids are present, long, slender, often doubled; on themselves to form spirals, without tentacles^but, well supplied with batteries of nematocysts. Sensory zooids, longer even then the defensive zooids, without tentacles or No. 17. Ilydractinia echinata. Family MYRIOTHELID^. " Polypites solitary, with very numerous, minute, capitate tentacula scattered over the body " (Hincks). Genus Myriothela. Trophosome. " Polypites solitary, cylindrical, terminating above in a conical proboscis, springing from an adherent base, which is clothed with a chitinous poly- pary; tentacles very small, capitate, covering the greater portion of the body" (Hincks). Gonosome. " Gonophores borne on coryniform processes, clustering around the base of the polypites, and containing fixed sporosacs" (Hincks). MyriotJwla plirygia (Fabricius). Trophosome. " Polypite cylindrical, very extensile; tentacles extremely numer- ous and closely set, covering about three-fourths of the body, with a reddish-brown spot on the capitulum; the basal portion of the body minutely speckled with white and crowded with the processes bearing the gonophores, which are slender, pointed above with a few wart-like tentacles on the upper portion; the adherent base massive, of a dark brown colour, sending out a few tubular and root-like prolongations" (Hincks). Gonosome. " Gonophores produced a little below the tentacles, subsessile, globular, when mature of a very large size and a pink colour; embryo actiniform " (Hincks).. Please note that these images are
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