. Text-book of embryology. Embryology. Fig. 328.—Two young TerebrcUulina septentrionalis immediately after the metamorphoses. (After Morse.) A, specimen showing six bundles of iirovisional cliaetae. B, specimen showing the origin of the first tentacles, axh, adult chaetae; h, head segment; , dorsal valve ; , larval chaetae ; m, mouth ; ten, first tentacles of the lophophore ; , ventral valve ; ped, peduncle. thoroughly clear up the subject, a few provisional conclusions may be briefly indicated. Professor Morse himself entertained no doubt that the Brachiopoda were an ancient offshoo
. Text-book of embryology. Embryology. Fig. 328.—Two young TerebrcUulina septentrionalis immediately after the metamorphoses. (After Morse.) A, specimen showing six bundles of iirovisional cliaetae. B, specimen showing the origin of the first tentacles, axh, adult chaetae; h, head segment; , dorsal valve ; , larval chaetae ; m, mouth ; ten, first tentacles of the lophophore ; , ventral valve ; ped, peduncle. thoroughly clear up the subject, a few provisional conclusions may be briefly indicated. Professor Morse himself entertained no doubt that the Brachiopoda were an ancient offshoot from the Annelidan stem, basing his conclusion on the presence of distinct segments and of chaeta-sacs in the larva. In most Brachiopoda there is no anus at all, although there is a blind and apparently functionless intestine; but in a few archaic genera, grouped together as Ecardines, an anus exists. In Lingula this is situated on one side, near the origin of the peduncle—which in this genus alone is muscular,—in the groove between dorsal and ventral mantle-lobes. In Crania it is situated in the middle line, at the posterior end of the animal, since in this genus the foot. 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
