. Comparative anatomy. Anatomy, Comparative. jHYPOPHYSIS PHARYNX NEOSTOMA. I NEOSTOMA AMPHIOXUS. PETROMYZON. Fig. 248.—Diagrams illustrating the paleostoma theory. A-D show stages in the development of a pre-oral (hypophysial) opening as in myxinoids and, according to Legros, as in Amphioxus. E-H show stages in the development of the hypophysis in petromyzon, in which the neostoma supplants the paleostoma. In the higher verte- brates the hypophysis is converted into an important endocrinal organ. (Redrawn from Johnston after Legros.) (1914) suggested that the mouth of Amphioxus is not homologo
. Comparative anatomy. Anatomy, Comparative. jHYPOPHYSIS PHARYNX NEOSTOMA. I NEOSTOMA AMPHIOXUS. PETROMYZON. Fig. 248.—Diagrams illustrating the paleostoma theory. A-D show stages in the development of a pre-oral (hypophysial) opening as in myxinoids and, according to Legros, as in Amphioxus. E-H show stages in the development of the hypophysis in petromyzon, in which the neostoma supplants the paleostoma. In the higher verte- brates the hypophysis is converted into an important endocrinal organ. (Redrawn from Johnston after Legros.) (1914) suggested that the mouth of Amphioxus is not homologous with that of vertebrates, but is comparable with the left spiracle of elasmobranchs. The foundations of this assumption, however, are weak. The enor- mous enlargement of the larval mouth of amphioxus, as well as its asym- metry are best interpreted as larval 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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