. Comparative anatomy. Anatomy, Comparative. COEUDMOSTOME DEGENERATE COELOMODUCT COELOMODUCT NEPHROSTOME NEPHRIDIUM lEPHRIDIOPORE "\NEPHROSTOME NEPHRIDIOPORE' Fig. 329.—Diagrams illustrating the varying relations of coelomoducts and nephridia. in different annelids. Nephridia like those seen in annelids also occur in cephalo- chordates. The coelomoducts are homologized with the renal tubules of vertebrates, although the latter are mostly excretory and not—as in annelids—reproductive in function. (Redrawn after Goodrich.) are probably the prototypes of those of the highly specialized solen
. Comparative anatomy. Anatomy, Comparative. COEUDMOSTOME DEGENERATE COELOMODUCT COELOMODUCT NEPHROSTOME NEPHRIDIUM lEPHRIDIOPORE "\NEPHROSTOME NEPHRIDIOPORE' Fig. 329.—Diagrams illustrating the varying relations of coelomoducts and nephridia. in different annelids. Nephridia like those seen in annelids also occur in cephalo- chordates. The coelomoducts are homologized with the renal tubules of vertebrates, although the latter are mostly excretory and not—as in annelids—reproductive in function. (Redrawn after Goodrich.) are probably the prototypes of those of the highly specialized solenocytes of annelids and amphioxus. (Fig. 328) Annelids. Two sorts of excretory organs occur in annelids, proto- nephridia and metanephridia, the former, as their name suggests, con- sidered the more primitive. (Fig. 329) Protonephridia. The protonephridia of annelids and molluscs are branched or unbranched excretory tubules which end bhndly within the body cavity or in the connective tissues. In the annelids they are seg- mentally arranged and are ectodermal in origin. Their inner blind ends are beset with numerous solenocytes. Each solenocyte is prolonged into a tubular capillary containing an elongated flagellum, which extends throughout the length of the capillary into the cavity of the nephridial tubules. The solenocytes gather liquid wastes from the surrounding tissues, and pass them to the nephridium and thus to the outside. Thus. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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