The Journal of experimental zoology . ively of one and thesame embryo, drawn 19 hours after the operation. A mass of cellular debris lies between the two halfembryos; the endoderm cells are chiefly contained in the anterior half, the mesenchyme and musclecells are entirely confined to the posterior half. Neither half at all resembles a normal embryo or 79, 80. Ventral and postero-dorsal views of another embryo, 19^ hours after the crescent of yellow cells is entirely confined to the posterior half and neither half resembles a normallarva. Fig. 81. Anterior and posteri
The Journal of experimental zoology . ively of one and thesame embryo, drawn 19 hours after the operation. A mass of cellular debris lies between the two halfembryos; the endoderm cells are chiefly contained in the anterior half, the mesenchyme and musclecells are entirely confined to the posterior half. Neither half at all resembles a normal embryo or 79, 80. Ventral and postero-dorsal views of another embryo, 19^ hours after the crescent of yellow cells is entirely confined to the posterior half and neither half resembles a normallarva. Fig. 81. Anterior and posterior half embryos 20 hours after the operation. Fig. 82. Pos-terior half embryo from the postero-dorsal side, 20 hours after the operation. The anterior half isdegenerating and is shown only in dotted outline; the posterior half contains all of the yellow cells andpractically no endoderm. At the stages represented by all these figures the normal embryos havealready undergone their metamorphoses. Mosaic Development in Ascidian Eggs. 195.
Size: 1439px × 1737px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology
