. The study of animal life [microform]. Zoology; Zoologie. 226 Th£ Study of Animal Life part in ways from other Coelenterates, thus the characteristic stinging cells are modified into adhesive cells. The first and second series, separated by diflferences of structure and development, are yet parallel. In both there are polype-types; in both medusoid types; in both there are single mdividuals and colonies of individuals; in both there are "corals. ^ ^^e n;--*)' compare a Hydra with a sea-anemone, a medusoid with a jelly- fish a hydroid colony with Dead-men's-fingers, Millepores wiih. the E
. The study of animal life [microform]. Zoology; Zoologie. 226 Th£ Study of Animal Life part in ways from other Coelenterates, thus the characteristic stinging cells are modified into adhesive cells. The first and second series, separated by diflferences of structure and development, are yet parallel. In both there are polype-types; in both medusoid types; in both there are single mdividuals and colonies of individuals; in both there are "corals. ^ ^^e n;--*)' compare a Hydra with a sea-anemone, a medusoid with a jelly- fish a hydroid colony with Dead-men's-fingers, Millepores wiih. the Evolution o/Stx ; after Haeckel.) lll-Ol the commoner reef-corals. Moreover, we may compare a mod liberated from a hydroid with Aurelia liberated from its fixed polyp. stage, and permanently-free medusoids with jellyfishes like Vda^ta, These arc physiological parallels. The sedentary polypes arc somewhat sluggish, with a tondomy to bud and to form shells or skeletons of some kind. 'I ho free- swimming medusoid types are active, they rarely bud, they d) not form skeletons, but their activity is sometijncs expressed m. 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 Thomson, J. Arthur (John Arthur), 1861-1933; Knight, Professor. Toronto : Morang
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
