Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 168 SYSTEMATIC ZOOLOGY. ORDER III.—SIPHONOPHORA. These may be defined as colonies of medusae, arising by budding. In these colonies the medusae become special- FIG. 15.—Diagram of a Siphono- uhore. c, covering scale; d, digestive sac; f, float; m, mouth of feeding individual; r, repro- ductive bell; s, swimming-bell; /, tentacle. ra •'«.' «5>Trf/Al<j«ijW

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