Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 166 AS YS TEMA TIC ZOOLOGY. In these jelly fishes (fig. 14, m) branches of the digestive tract run to the margins of the umbrella, where they connect with a ring canal which runs around its rim near FIG. 14.—A Hydroid (Beugcrinvilleq). After Allman, from Lang, h, hydranth; mk, medusa-buds; m, a free-swimming medusa. At the base are seen the root-like stolons connecting the colony together. the bases of the tentacles. These hydrozoan medusae can be recognized by having the opening of t
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 166 AS YS TEMA TIC ZOOLOGY. In these jelly fishes (fig. 14, m) branches of the digestive tract run to the margins of the umbrella, where they connect with a ring canal which runs around its rim near FIG. 14.—A Hydroid (Beugcrinvilleq). After Allman, from Lang, h, hydranth; mk, medusa-buds; m, a free-swimming medusa. At the base are seen the root-like stolons connecting the colony together. the bases of the tentacles. These hydrozoan medusae can be recognized by having the opening of the bell partially closed by a thin membrane (velwri) shown in the figure. These medusae separate from the colony and swim freely through the water, and they produce eggs from which are developed other colonies. Here is a point which needs emphasis. From the egg is developed a hydranth which by budding gives rise to
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