. Text-book of embryology. Embryology. 534 INVEKTEBKATA CHAP. Ophiuroidea, and Echinoidea respectively; the radial canals of the Holothuroidea, the rudiments of which are represented by the secondary lobes of the hydrocoele, would therefore, on this hypothesis, not be homologous with those of other Fig. 397.—Three views of young Auricularia larvae of Synapta digitata viewed from the dorsal surface, showing the division of the coelom. (After Metschnikoff.) A, the coelom still undivided, but extending far backwards. B, the coelom divided into anterior and posterior portions. C, the
. Text-book of embryology. Embryology. 534 INVEKTEBKATA CHAP. Ophiuroidea, and Echinoidea respectively; the radial canals of the Holothuroidea, the rudiments of which are represented by the secondary lobes of the hydrocoele, would therefore, on this hypothesis, not be homologous with those of other Fig. 397.—Three views of young Auricularia larvae of Synapta digitata viewed from the dorsal surface, showing the division of the coelom. (After Metschnikoff.) A, the coelom still undivided, but extending far backwards. B, the coelom divided into anterior and posterior portions. C, the posterior portion of the coelom divided into right and left halves, , anterior division of the coelom ; calc, calcareous body ; j).coe, posterior division of the coelom; , longitudinal ciliated band; coe, undivided coelomic sac; lp,G, left posterior coelom ; mp, madeporic pore ; oes, oesophagus ; r.^^-e, right posterior coelom ; st, stomach ; .ttom, stomodaeum. But the whole of this theory is shattered by our knowledge of the development of Cucumaria planci, first described by Selenka but worked out with care by Ludwig (1891).. 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
