. Journal of morphology. Figs. 8 to 10 Corresponding stages in the eggs of C. f ornicata, C. convexa, and , drawn to the same scale. The blastomeres correspond cell for cell exceptthat one additional ectoderm cell (the basal cell in the posterior arm of the cross,shaded by transverse lines) is present in C. adunca (fig. 10) which is not presentin the other species. There are present: 39 ectoderm cells (40 in C. adunca),6 mesoderm cells, 7 endoderm cells. 176 EDWIN G. CONKLIN later stages, the number of ectoderm cells being greater in thelarger eggs than in the smaller ones. Up to the 5
. Journal of morphology. Figs. 8 to 10 Corresponding stages in the eggs of C. f ornicata, C. convexa, and , drawn to the same scale. The blastomeres correspond cell for cell exceptthat one additional ectoderm cell (the basal cell in the posterior arm of the cross,shaded by transverse lines) is present in C. adunca (fig. 10) which is not presentin the other species. There are present: 39 ectoderm cells (40 in C. adunca),6 mesoderm cells, 7 endoderm cells. 176 EDWIN G. CONKLIN later stages, the number of ectoderm cells being greater in thelarger eggs than in the smaller ones. Up to the 52-cell stage thenumber of cells is the same in the eggs of all the species examined;at this stage one additional ectoderm cell appears in the posteriorarm of the cross in C. adunca which does not appear until laterin the other species (the additional cell is the one shaded by trans-verse lines in fig. 10). At the 82-cell stage four such additionalcells are present in C. adunca, two in the posterior arm of thecross and tw
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
