. Journal of morphology. 155 156 157 158 Figs. 151 to 158 Stage 13. A series of embryos of Cryptobranchus alleghe-niensis showing early stages in the formation of the neural folds and the segmenta-tion of the neural plate. Camera drawings, finished under the binocular, frompreserved material. I, II and III indicate the earliest transverse grooves; 1,2, 3, grooves appearing a little later, numbered consecutively and not in the orderof appearance. X 6. tion that the surface just outside of the neural folds becomesvery much roughened and traversed by fissures parallel to thefolds, indicating stre
. Journal of morphology. 155 156 157 158 Figs. 151 to 158 Stage 13. A series of embryos of Cryptobranchus alleghe-niensis showing early stages in the formation of the neural folds and the segmenta-tion of the neural plate. Camera drawings, finished under the binocular, frompreserved material. I, II and III indicate the earliest transverse grooves; 1,2, 3, grooves appearing a little later, numbered consecutively and not in the orderof appearance. X 6. tion that the surface just outside of the neural folds becomesvery much roughened and traversed by fissures parallel to thefolds, indicating stresses and the rapid shifting of the later part of this stage a pair of less conspicuoustransverse folds appear lateral to the anterior end of the neuralplate (fig. 158); the significance of these folds has not yet beendetermined with certainty (but see Stage 15). The first transverse groove to cross the neural plate is shownin figure 152. A little later, two transverse grooves appear inrapid succession pos
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Keywords: ., bookcentury1900, bookdecade1, booksubjectphysiology, bookyear1912
