Observations on the Development of the Head in Gobius capito

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Abstract
1. The neural axis in Gobius terminates at a point near the optic stalks, precisely as stated by Goronowitsch for the salmon. An indentation and the disposition of the cells at this spot indicate a rudimentary neuropore. In later embryos a characteristic crucial lumen, which may be traced continuously from behind forwards, gives auother indication of the termination of the axis, and also shows that the corpora striata belong to the upper part of the wall of the brain. 2. Mouth and hypophysis arise as solid ingrowths of ectoderm. That the earliest and maximum ingrowths are independent and paired is probably an embryonic feature due to the mode of development of the brain and eyes. Nothing has been observed to indicate that the mouth was ever anything but a mouth. 3. Skeletal structures of both upper and lower jaws arise from one condensation of mesoderm round the ectodermic ingrowth of the mouth. 4. The jaw muscles do not arise from the "Seitenplatten"--a point of considerable theoretical importance.

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