OCR Text |
Show 154 DR. W. G. RIDEWOOD ON T H E [Jan. 19, by the prelachrymal apertures, and except in their lower parts show very little in the way of internal partitions. The two nasal cavities appear as one large single cavity, presumably owing to the septum nasi being unossified, and, therefore, missing in the dried skull. The vomer in this region has the foi'm of a deep trough with a shax-p keel below, and presents a Y-shaped section, situated some distance above the palatine bones. The turbinal bones seen are tlxe posterior parts of the maxillo-turbinals. Text-fig. 8. bcutsph. pterySf- View, looking forwards, of the skull cut in the direction of the line 4 in text-fig. 4. One-third (linear) of the natural size. The section shown in text-fig. 7 (p. 153) is taken through the middle of the orbit and through the median horn (see line 3 in text-fig. 4, p. 151). The view taken is that looking forward, so that the thix-d molar teeth, the hamular processes of the pterygoid bones, |