File:The Journal of experimental zoology (1905) (14757202906).jpg

Identifier: journalofexperim02harr (find matches)
Title: The Journal of experimental zoology
Year: 1905 (1900s)
Authors: Harrison, Ross G. (Ross Granville), 1870-1959 Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology American Society of Zoologists
Subjects: Zoology
Publisher: (New York, etc.) Wiley-Liss (etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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(B*-) are larger than normal. There are two pairs of caudalendoderm cells (B^- and B^-^). A pair of ventral ectoderm cells is visible in the midline behind. Figs. 55-57. Three views of one and the same embryo; spurted in the 4-ceU stage, fixed 4 hourslater, normal embryos being in the stage represented by Fig. 11. Fig. 55. Dorsal view of the super-ficial ectoderm. The notch in front represents the notch in the ventral lip of the blastopore. Fig. 56.Same view, deeper focus, showing the muscle cells beneath the ectoderm; these cells are continuousfrom side to side, there being no chorda in the midline. Fig. 57. Same view, still deeper focus, showingthe double row of ventral endoderm cells in the midline, and on each side of this a mass of mesenchymecells. Fig. 58. Ventral view of posterior half embrjo of the same stage as the preceding, showing themuscle and mesenchyme cells beneath the ectoderm and on each side of the strand of ventral endoderm. Mosaic Development in Ascidian Eggs. I8I
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