. The Danish Ingolf-expedition. ^m^ C: ^^0^^mmi^ 2 [jaZneilo LrisLoinii Plate IX, Plate IX. Figs. I—5. Successive horizontal sections through an embryo in stage II. The entoderm too badlypreserved to be figured (the large vacuolated cells apparently fill the whole spacebetween the ectoderm and oesophagus, but an entodermal cavity is doubtless I—3 show the costse, 2 — 3 the tentacle-rudiment. In fig. 2 the oesophagus is cut at thelevel, where it passes into the transversal furrow; the latter is cut at different levels infigs. 3—5. 8%. — 6—14. Successive horiz

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. The Danish Ingolf-expedition. ^m^ C: ^^0^^mmi^ 2 [jaZneilo LrisLoinii Plate IX, Plate IX. Figs. I—5. Successive horizontal sections through an embryo in stage II. The entoderm too badlypreserved to be figured (the large vacuolated cells apparently fill the whole spacebetween the ectoderm and oesophagus, but an entodermal cavity is doubtless I—3 show the costse, 2 — 3 the tentacle-rudiment. In fig. 2 the oesophagus is cut at thelevel, where it passes into the transversal furrow; the latter is cut at different levels infigs. 3—5. 8%. — 6—14. Successive horizontal (slightly oblique) sections through an embryo in stage III, preparedout of the egg-membrane. ^°/i. Fig. 6 goes through the upper edge of or above the apical organ, showing onl}- theexcretory canals. The epithelial lining around them is the epidermis, the apical organhaving been rather sunken in the specimen sectioned. The substance lying between thetwo excretory canals is the cupule. (Comp. PI. VII. Fig. 3). Fig. 7. The section goes through

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Keywords: ., bookcentury1800, bookdecade1890, booksu, booksubjectmarineanimals