Journal of morphology . •;.TiJH«f«S 154 WHEELER, EXPLANATION OF PLATE IIL{Xiphidium ensi/erum.) Fig. 21. Median longitudinal section through the head of an embryo overwhich the envelopes have just closed. X 230. 0., stomodceum ; am., amnion ;J., serosa; , indusium ; s., pedicel uniting the indusium to the head of thaembryo ; ec, ectoderm ; ms., mesoderm ; vph., vitellophag ; v., yolk. Fig. 22. Median tranverse section of the indusium when it has reached halfway round the egg. X 230. , inner indusial layer ; «;«., outer indusial layer ;s., serosa. Fig. 23. Three normal cells from the in
Journal of morphology . •;.TiJH«f«S 154 WHEELER, EXPLANATION OF PLATE IIL{Xiphidium ensi/erum.) Fig. 21. Median longitudinal section through the head of an embryo overwhich the envelopes have just closed. X 230. 0., stomodceum ; am., amnion ;J., serosa; , indusium ; s., pedicel uniting the indusium to the head of thaembryo ; ec, ectoderm ; ms., mesoderm ; vph., vitellophag ; v., yolk. Fig. 22. Median tranverse section of the indusium when it has reached halfway round the egg. X 230. , inner indusial layer ; «;«., outer indusial layer ;s., serosa. Fig. 23. Three normal cells from the indusium. X 700. Fig. 24. Three cells with shrivelled nuclei from the indusium. X 700. Fig. 25. Transverse section through basal abdominal region of an embryopassing to the dorsal surface of the yolk. X 230. 7tb., neuroblasts; db., derma-toblasts ; am., amnion ; ms., mesoderm ; ec, ectoderm. Fig. 26. Transverse section through first maxillary segment of an embryopassing to the dorsal surface of the yolk. X 230. ng.,
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
