Page:The Book of the Aquarium and Water Cabinet.djvu/98

86 resemblance is the strongest are grouped together under the general designation of Zoophytes. In Zoophytes, the leading feature of a radiate animal is very distinctly observable, and that leading feature is the arrangement of the vital organs around a centre, the organs composing

the rays of the imaginary star, or the petals of the imaginary flower, to which the mouth or stomach is the centre.