. Text-book of embryology. Embryology. IV creeping stolons which j Its lower part secretes a The adult colony, however, is still unripe sexually; full sexual ma- turity is only reached by thegonophores produced subsequently, and thus we have an alternation of asexual and sexual generations. The development of these gonophores in the case of Tubularia (as well as in the case of many other genera) has been worked out by Gotte (1907); we follow his account in what foUows. From just above the region of the aboral tentacles, finger-like stolons grow out, and on these, lateral protrusions arise, whi
. Text-book of embryology. Embryology. IV creeping stolons which j Its lower part secretes a The adult colony, however, is still unripe sexually; full sexual ma- turity is only reached by thegonophores produced subsequently, and thus we have an alternation of asexual and sexual generations. The development of these gonophores in the case of Tubularia (as well as in the case of many other genera) has been worked out by Gotte (1907); we follow his account in what foUows. From just above the region of the aboral tentacles, finger-like stolons grow out, and on these, lateral protrusions arise, which are the medusa-buds. At the tip of such a bud, the COELENTEEATA 57- ;ive rise at intervals to other upright shoots, horny shell, the Fig. 32.—Two gonophores of Tubularia indivisa with developing embryos inside. (After AUman.) A, gonophore with discoid embryo ; opening of umbrella-cavity just formed; radial canals clear. B, gonophore with actinnla larva just escaping; radial canals have disappeared. Act, actinula; em6, embryo; , radial canal; sp, manubrium or spadix; u, opening of 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
Size: 1597px × 1564px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectembryology
