. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 60. Dorsal views of the brains of: A. a primitive synbranchiform Macrotrema caligans. B. the channiform Channa striatus. C. the gobiesociform Alabes dorsalis. In A and B the forebrains are specialized in having the left and right halves coalesced posteriorly, while in C the primitive state of completely separated forebrain hemispheres is represented. Abbreviations: CB, cerebellum; EP. epiphysis; FB, forebrain; MO, medulla oblongata; OB, olfactory bulbs; OL, optic lobes; SY, sulcus ypsilanti. pharyngeal epitheli
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Figure 60. Dorsal views of the brains of: A. a primitive synbranchiform Macrotrema caligans. B. the channiform Channa striatus. C. the gobiesociform Alabes dorsalis. In A and B the forebrains are specialized in having the left and right halves coalesced posteriorly, while in C the primitive state of completely separated forebrain hemispheres is represented. Abbreviations: CB, cerebellum; EP. epiphysis; FB, forebrain; MO, medulla oblongata; OB, olfactory bulbs; OL, optic lobes; SY, sulcus ypsilanti. pharyngeal epithelium and the linings of outpocketings of the buccopharynx (, Monopteriis ciichia, all channiforms) for gas with atmospheric air. These outpocketings maintain a continuously open communication with the bucco- pharynx. Both groups have enlarged mesopter- ygoids (or entopterygoids). In channi- forms (Fig. 59) the large mesopterygoid is very closely associated with the large toothed palatine and the small toothless ectopterygoid. Rosen and Greenwood (1976: 45-48) imply that the mesoptery- goid in synbranchiforms is missing and that the ectopterygoid is large and toothed. Such an interpretation seems unlikely, if synbranchiforms and channi- forms are sister groups. The topographi- cal features of the bone in the synbran- chifonns and die condition of the element in the channiforms indicate that the bone in synbranchiforms is an enlarged me- sopterygoid (as in channiforms). The ec- topterygoid is present as a small toothless element (Fig. 59). The olfactory rosette. 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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