. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 202 Balfoue gives a stage between J and K as the first time any thicken- ings are seen, but as his observations seem to relate to Pristiurus or Scyllium embryos, any comparisons can hardly be made. Ziegler gives the commencement of the involution of the organ as between J and JST, which agrees with my own observations. Fig. 1 shews the median longitudinal section through the head of an embryo in stage H. At the foremost situated point of the head the neuroporus is seen still open but on the verge of closing and the division o
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 202 Balfoue gives a stage between J and K as the first time any thicken- ings are seen, but as his observations seem to relate to Pristiurus or Scyllium embryos, any comparisons can hardly be made. Ziegler gives the commencement of the involution of the organ as between J and JST, which agrees with my own observations. Fig. 1 shews the median longitudinal section through the head of an embryo in stage H. At the foremost situated point of the head the neuroporus is seen still open but on the verge of closing and the division of the brain into different lobes has commenced. A little laterally of the neuroporus the thickenings which repre- sent the first indications of an olfactory organ are found and Fig. 2 shews a longitudinal section there-from. This is the relative position in which van Wijhe (3) has found. Fig. 1. Median longitudinal section through an embryo of Torpedo ocellata, Stage 120/1. The figures are drawn with the Abbe Camera Lenses 16,8 or 4 mm and Comp. Oc. 4 by Zeiss. Reference letters in above. Ajp. Neuroporus. 01. O, olfactory organ. Ec. ectoderm. Nc. connecting cells. 01. L. olfactory lobe. 01. B. olfactory Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer
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