. Text-book of embryology. Embryology. stem Fig. 313.—The development of the larva of Membranipora pilosa, (After Prouho.) A, young larva just free from the egg-membrane ; ewd, solid mass of cells which will be hollowed out to form the stomach. The stomodaeum is formed, but does not join the stomach as yet. B, young larva in which the stomodaeum has joined the stomach. C, larva a little older than that repre- sented in B, in which the proctodaeal invagination has been formed, ap, apical plate; co, corona; proct, proctodaeal invagination ; mes, ectomesoderm. powerful locomotor cilia on certain
. Text-book of embryology. Embryology. stem Fig. 313.—The development of the larva of Membranipora pilosa, (After Prouho.) A, young larva just free from the egg-membrane ; ewd, solid mass of cells which will be hollowed out to form the stomach. The stomodaeum is formed, but does not join the stomach as yet. B, young larva in which the stomodaeum has joined the stomach. C, larva a little older than that repre- sented in B, in which the proctodaeal invagination has been formed, ap, apical plate; co, corona; proct, proctodaeal invagination ; mes, ectomesoderm. powerful locomotor cilia on certain cells of the thickened ridge of ectoderm, termed the mantle, which forms the border of the oral face. The space surrounded by the mantle has become concave, and it is termed the atrium; into it the stomodaeum opens. The ring of ciliated cells is termed the corona. The embryo now becomes a larva and swims about; the remnants of the vitelline membrane which still envelop it in the middle are brushed off. After the free life has begun the mass of cells forming the endoderm becomes hollowed out and forms the larval 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
