. Text-book of embryology. Embryology. H r^. Fig. 275.—Side views of two young specimens of Dreissensiapolymorpha after the metamorphosis has taken place. (After Meisenheimer.) A, young specimen in which the shell retains the shape it possessed in the veliger. B, older specimen in which the shell is beginning to assume its adult proportions, a, anus; , anterior adductor muscle ; , posterior adductor muscle; 6r, rudiments of gills; eg, cerebral ganglion ; c.^, cerebral pit; /, foot; i/, heart; hep, liver; fc, kidney ; , labial palp ; ot, otocyst; per, pericardium; , pedal gangli

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. Text-book of embryology. Embryology. H r^. Fig. 275.—Side views of two young specimens of Dreissensiapolymorpha after the metamorphosis has taken place. (After Meisenheimer.) A, young specimen in which the shell retains the shape it possessed in the veliger. B, older specimen in which the shell is beginning to assume its adult proportions, a, anus; , anterior adductor muscle ; , posterior adductor muscle; 6r, rudiments of gills; eg, cerebral ganglion ; c.^, cerebral pit; /, foot; i/, heart; hep, liver; fc, kidney ; , labial palp ; ot, otocyst; per, pericardium; , pedal ganglion ; , retractor of foot; st, stomach ; , visceral ganglion. is therefore not ectodermal but coelomic in origin. The limb of the. 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 MacBride, E. W. (Ernest William), 1866-1940; Kerr, John Graham, 1869-; Heape, Walter, 1855-1929. London : Macmillan

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Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology