. Animal life and intelligence. Biology; Animal intelligence; Psychology, Comparative; Evolution. Reproduction and Development. 47 excreta Here, in damp places, pools, and ditches, free and active embryos are hatched out of the eggs. Each embryo (Fig. 10, C, much enlarged) is covered with cilia, except at the anterior end, which is provided with a head-. Fig. 10.—Liver-fluke : Embryonic stages. (After A. P. Thomas.) A. Ovum: em., embryo; op., operculum. B. Limnceus truticatulus (uatural size). C. Free •embryo: , eye-Rpot; ex., excretory vessel; , germinal cells; , head-papilla. D. E
. Animal life and intelligence. Biology; Animal intelligence; Psychology, Comparative; Evolution. Reproduction and Development. 47 excreta Here, in damp places, pools, and ditches, free and active embryos are hatched out of the eggs. Each embryo (Fig. 10, C, much enlarged) is covered with cilia, except at the anterior end, which is provided with a head-. Fig. 10.—Liver-fluke : Embryonic stages. (After A. P. Thomas.) A. Ovum: em., embryo; op., operculum. B. Limnceus truticatulus (uatural size). C. Free •embryo: , eye-Rpot; ex., excretory vessel; , germinal cells; , head-papilla. D. Embryo preparing to become a sporocyst: , germinal cells. E. Sporocyst: g., gastrula; m., morula; re., redia. F. Redia: , birth-opening; ce., cercaria; col., collar; di„ digestive sac; ph., pharynx; , posterior processes; re., daughter redia. G. Cercaria: cys., cysto- genous organ; di., digestive sac; , oral sucker; , posterior sucker; ph., pharynx. papilla (). When the embryo comes in contact with any object, it, as a rule, pauses for a moment, and then. 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 Morgan, C. Lloyd (Conwy Lloyd), 1852-1936. Boston, Ginn
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