Abstract
THE pterygoquadrate in the embryos of I. glutinosus Linn. shows the ascendens and the otic processes; in the orbitotemporal region the basal process is not developed, and, therefore, the union of it with the basitrabecular process as seen in Siphonops (70–mm. larva, Edgeworth, Fig. 386) is absent. The relation of the processus ascendens with the orbital cartilage has been variously described. According to Edgeworth1 and Winslow2, a connexion is established in embryonic stages, while Peter3, who examined a slightly older stage than that of Edgeworth, does not show it. Prof. E. S. Goodrich suggested to me (in litt.) that this difference may be due to the two authors examining two different species of Ichthyophis, but this may not be so, for both secured their material from Dr. F. Sarasin. In my sections of a 30–mm. embryo of I. glutinosus at any rate the ascendens connexion is not present, thus resembling Hypogeophis.
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References
Edgeworth, F. H., "The Cranial Muscles of Vertebrates" (Cambridge, 1935).
Winslow, G. M., Tuft's College Studies, No. 5, 147 (1898).
Peter, K., Morph. Jahrb., 25. (1898).
Goodrich, E. S., "The Structure and Development of Vertebrates" (London, 1930).
Marcus, H., Stimmelmayr, E., and Porsch, G., Morph. Jahrb., 76,(1935).
de Beer, G. R., "The Development of the Vertebrate Skull" (Oxford, 1937).
Ramaswami, L. S., Rec. Ind. Mus., 43 (1941).
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RAMASWAMI, L. Pterygoquadrate Connexions in the Embryos of Ichthyophis glutinosus (Apoda). Nature 148, 470 (1941). https://doi.org/10.1038/148470a0
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DOI: https://doi.org/10.1038/148470a0
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