. Text-book of embryology. Embryology. FiQ. 302.—Later stage in the segmentation of the egg of Phascolosoma qouldii, viewed from the posterior aspect. (After Gerould.) Cells belonging to the second quartette are dotted ; those belonging to the third quartette are ruled with vertical U"' Pig. 303.—Two views of tlie apical region of the segmenting egg of Phascolosoma vulgare. (After Gerould.) The apical and the prototrochal cells are left white. The "peripheral rosettes "or "Annelidan cross" cells are covered with circles, whilst the "intermediate girdle cel
. Text-book of embryology. Embryology. FiQ. 302.—Later stage in the segmentation of the egg of Phascolosoma qouldii, viewed from the posterior aspect. (After Gerould.) Cells belonging to the second quartette are dotted ; those belonging to the third quartette are ruled with vertical U"' Pig. 303.—Two views of tlie apical region of the segmenting egg of Phascolosoma vulgare. (After Gerould.) The apical and the prototrochal cells are left white. The "peripheral rosettes "or "Annelidan cross" cells are covered with circles, whilst the "intermediate girdle cells " or " cross " are ruled with horizontal lines. A, early stage. B, 4S-cell stage, , polar bodies. These cells in Phascolosoma are very large and extend backwards so as to overlap and cover the cells of the second and third quartettes. They become thickly covered with somewhat small cilia. The three. 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
