. Journal of comparative neurology . 16 627 PLATE 6 EXPLANATION OF FIGURES 17 From a 76-hoiir embi-yo; shows the detail of the preauditory placode, andits resemblamce to the auditory vesicle in early stages. This figure is taken fivesections in front of the vesicle. X 300. 18 Shows the auditory vesicle and the first gill thickening in a 100-hour em-bryo. The overlapping of the thickening by the vesicle is shown in this 19 Shows the detail of the preauditory placode in an 82-hour embryo. Thegeneral reduction in the size of the placode and the gradual loss of radial cell ar-rangeme
. Journal of comparative neurology . 16 627 PLATE 6 EXPLANATION OF FIGURES 17 From a 76-hoiir embi-yo; shows the detail of the preauditory placode, andits resemblamce to the auditory vesicle in early stages. This figure is taken fivesections in front of the vesicle. X 300. 18 Shows the auditory vesicle and the first gill thickening in a 100-hour em-bryo. The overlapping of the thickening by the vesicle is shown in this 19 Shows the detail of the preauditory placode in an 82-hour embryo. Thegeneral reduction in the size of the placode and the gradual loss of radial cell ar-rangement may be seen by a comparison of figures 1 and 22. X 300. 20 From a 120|-hour embryo, shows the mandibular line. The radial ar-rangement of the cells is not so apparent as in the other lines. X 300. 21 Shows the appearance of the primordium of the supra-orbital and infra-orbital lines combined in a 106-hour embryo. This section also shows that thesensory line primordium lies at a more dorsal level than the posterior extensionof the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedicine, bookyear191
