. The Journal of comparative neurology and psychology. ior to the earliest stage studied by these authors. With regard to the mesectoderm derived from the neural crestwhich extends down into the mandibular and other visceral archesfrom the cranial ganglia, I can fully confirm the statements made byISTeal and illustrated in his Plate 3 (1898). To these statementsone addition requires to be made which is at the same time an addi-tion to the early history of the anterior head cavity and preoral ento-derm. The details of the earliest appearance of the anterior headcavity have not been given by Mis
. The Journal of comparative neurology and psychology. ior to the earliest stage studied by these authors. With regard to the mesectoderm derived from the neural crestwhich extends down into the mandibular and other visceral archesfrom the cranial ganglia, I can fully confirm the statements made byISTeal and illustrated in his Plate 3 (1898). To these statementsone addition requires to be made which is at the same time an addi-tion to the early history of the anterior head cavity and preoral ento-derm. The details of the earliest appearance of the anterior headcavity have not been given by Miss Piatt or by ISTeal, who was con-cerned chiefly with neural segmentation, and Dohrns (1904) treat-ment of the anterior head cavity is unsatisfactory. Johnston, Forehrain Vesicle in Vertebrates. 469 Hoffmanns description (1896) is more complete, but he failedto recognize the source of the mesectoderm beneath the terminal he describes as a median mass between the lower border of theneuropore and the infundibulum connecting the anterior head. Fig. 3. Squalus acanthias, 17 somites, median sagittal section. The noto-chord is marked by cross lines and the undifferentiated median mass and pre-oral entoderm by dots. nch
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