. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Supplementary observations were made on Emys, Chelydra, and Trionyx. The stage immediately following the fusion of the nasal proc- esses in CJirysemys is shown in Figure 16. In general shape the nasal cavitv eloselv resembles the earlier stages, l)nt the long. Figure 16. Chrysemiis 1076 (; MC). Transverse sections through the nasal area. A, section 264; B, 13 sections posterior to A; C, 11 posterior to B; and D, 11 posterior to C. 23x. Figure 17. Chryscmys 972 (; MC
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 126 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY Supplementary observations were made on Emys, Chelydra, and Trionyx. The stage immediately following the fusion of the nasal proc- esses in CJirysemys is shown in Figure 16. In general shape the nasal cavitv eloselv resembles the earlier stages, l)nt the long. Figure 16. Chrysemiis 1076 (; MC). Transverse sections through the nasal area. A, section 264; B, 13 sections posterior to A; C, 11 posterior to B; and D, 11 posterior to C. 23x. Figure 17. Chryscmys 972 (; MC). Transverse sections through the nasal area. A, section 250; B, 8 sections posterior to A; C, 10 posterior to B; D, 6 posterior to C; E, 5 posterior to D; and F, 5 posterior to E. 23x. narial opening has been divided into an anteroventral naris externus and a long slitlike choana on the palate. Anteriorly, the nasal cavity is oval in shape while posteriorly it becomes a long slit, due mainly to a marked dorsal extension. Tn the region of the choana there is a small lateral groove at the ventral margin of the nasal cavity. Altliougli tlie nasal processes are. 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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