. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY parietal eye, its influence causes and maintains an opening in the bony shield over the brain. This opening is the parietal foramen —always median but variable in position even within species (El- Toubi, 1945, p. 5), lying either between the two parietal bones, between the two frontal bones, or in the fronto-parietal suture (Fig. 4). A corresponding foramen is of frequent occurrence in Paleozoic Agnatha and fishes, and in Paleozoic and Mesozoic amphibians and reptiles. BICTAL O

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY parietal eye, its influence causes and maintains an opening in the bony shield over the brain. This opening is the parietal foramen —always median but variable in position even within species (El- Toubi, 1945, p. 5), lying either between the two parietal bones, between the two frontal bones, or in the fronto-parietal suture (Fig. 4). A corresponding foramen is of frequent occurrence in Paleozoic Agnatha and fishes, and in Paleozoic and Mesozoic amphibians and reptiles. BICTAL OdCAN y PINEAL OWCAN |<Vllllll]IIIIIIIIIIIIIMIIIIIII|IIJ. "EPIOCftMIS- "•CORIUM - SKULL"-- PABAPHYSIS ,^p„„^^ [A CyCLOSTOME|H*BENULA«' • MIOBAAIN INCAL NERVE ITERfOft COMMISSURE. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum

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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology