. Comparative anatomy. Anatomy, Comparative. A. .BRAIN. ENTERON' a: b.' c' Fig. 510.—Diagrams of frontal and cross sections of Amphioxus (cephalochordate), Amia (ganoid), and Squalus (elasmobranch) embryos, showing the exact homology of the anterior endodermic diverticula of Amphioxus, the adhesive organs of Amia, and the anterior somites of Squalus. A, A', A^, A^ sections of amphioxus; B, B' sections of Amia; C, C sections of Squalus. cavities, there are mesenchyma cells anterior to the premandibular somite which may represent the anterior cavities. The assertion that the anterior cavities &q
. Comparative anatomy. Anatomy, Comparative. A. .BRAIN. ENTERON' a: b.' c' Fig. 510.—Diagrams of frontal and cross sections of Amphioxus (cephalochordate), Amia (ganoid), and Squalus (elasmobranch) embryos, showing the exact homology of the anterior endodermic diverticula of Amphioxus, the adhesive organs of Amia, and the anterior somites of Squalus. A, A', A^, A^ sections of amphioxus; B, B' sections of Amia; C, C sections of Squalus. cavities, there are mesenchyma cells anterior to the premandibular somite which may represent the anterior cavities. The assertion that the anterior cavities "have not been found at all in other gnathostomes" may be questioned, since Reighard ('02) has shown that the adhesive organs of amia, a ganoid fish, resemble the anterior cavities both in development and in their relations to the preoral gut and to the premandibular somite, and must therefore be considered. 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 Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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