. Text-book of embryology. Embryology. XVI ECHINODEEMATA 477 The larval oesophagus or stomodaeum, as in Asterias, becomes disconnected from the larval stomach, shallows out and disappears. The larval stomach, which, as we have seen, forms the adult pyloric sac, begins to give off blunt outgrowths into the cavities of the nascent arms: these are the rudiments of the pyloric caeca (Fig. 369). The adult stomach, begun as we have noted as an out- growth on the left side of the larval stomach, increases in size and comes in contact with the ectoderm at a spot between the dorsal and ventral horns of
. Text-book of embryology. Embryology. XVI ECHINODEEMATA 477 The larval oesophagus or stomodaeum, as in Asterias, becomes disconnected from the larval stomach, shallows out and disappears. The larval stomach, which, as we have seen, forms the adult pyloric sac, begins to give off blunt outgrowths into the cavities of the nascent arms: these are the rudiments of the pyloric caeca (Fig. 369). The adult stomach, begun as we have noted as an out- growth on the left side of the larval stomach, increases in size and comes in contact with the ectoderm at a spot between the dorsal and ventral horns of the left posterior coelom. These horns meet above it, and so the left posterior coelom is converted into a ring. Within this ring lies the ring formed by the hydrocoele, and beneath this the ring formed by the peri-oral coelom. The holes in the septum dividing the anterior coelom from the left posterior coelom become healed up, and with the progressive constriction of the neck 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
