. The Journal of comparative neurology and psychology. Fig. 26. Fig. 27- Fig. 2G. Amblystoma p., invagiuatiou of hypophysis beginning; primitive inferior lobes. Sagittal section of head, x 27. Amblystoma p., hypophysial invagination at its height; velum transversum and epiphysis; median sagittal section reconstructed from several sections. X 25. of the neuropore, but in later stages a slight pit is found whichmay correspond to the neuroporic recess described in other forms(Fig. 33). The early appearance of the retinal areas on the neural platewas first described by Eycleshymer (1890) a
. The Journal of comparative neurology and psychology. Fig. 26. Fig. 27- Fig. 2G. Amblystoma p., invagiuatiou of hypophysis beginning; primitive inferior lobes. Sagittal section of head, x 27. Amblystoma p., hypophysial invagination at its height; velum transversum and epiphysis; median sagittal section reconstructed from several sections. X 25. of the neuropore, but in later stages a slight pit is found whichmay correspond to the neuroporic recess described in other forms(Fig. 33). The early appearance of the retinal areas on the neural platewas first described by Eycleshymer (1890) and the fact that theoptic vesicles are formed from the lateral parts of the neural platehas been pointed out by the writer (1905, 1906). Wliile the neuralplate is still open the retinal pits are connected with one anotherby a shallow groove running just behind the terminal ridge (, r. po). As the neural plate rolls up and the optic vesicles areevaginated this groove grows deeper (Figs. 24, 25) and by the time 492 Journal of Comparative Neurolog
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