. Animal life as affected by the natural conditions of existence. Animal ecology. 170 THE INFLUENCE OV INANIMATE SUEKOUNDINGS. some species of Lucina (fig. 48, a), situated on the ventral margin of the mantle. In the Annelida the gills are usually an appendage of the legs, and sometimes are placed directly on the body or at the fore end, as in Sabella, Serpula, Terehella, &c. Finally, the number of Invertebrata is by no means small which dispense entirely with such distinct, conspicuous organs. Tig. of Mollusca. a, ItKtna pliilippensis, with four mantle gUls belund the muscle m;
. Animal life as affected by the natural conditions of existence. Animal ecology. 170 THE INFLUENCE OV INANIMATE SUEKOUNDINGS. some species of Lucina (fig. 48, a), situated on the ventral margin of the mantle. In the Annelida the gills are usually an appendage of the legs, and sometimes are placed directly on the body or at the fore end, as in Sabella, Serpula, Terehella, &c. Finally, the number of Invertebrata is by no means small which dispense entirely with such distinct, conspicuous organs. Tig. of Mollusca. a, ItKtna pliilippensis, with four mantle gUls belund the muscle m; b, Mytilus, with i the gills, and I the laminated lip ; e, Elyria grmdu (Bergh.), destitute of gills ; d, Doris sp., with a tall tuft of dorsal branchite. of respiration, and consequently breathe only through the skin; among the Mollusca there are the Elysiadce (fig. 48, c) and theu- allies; among the Annelida the common leech and the Oligo- chietffi (the earth-worm, &c.); many of the lower Crustaceans- parasitical as well as independent—all Infusoria, the Coelente- rata, and even many Echinodermata, & 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton
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