154 



DR. AV. G. RIDEWOOD ON THE 



[Jan. 19, 



by the pi^elachrymal apertures, and except in their lowei- parts 

 show very little in the way of internal paititions. 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 form of a deep 

 ti'ough with a sharp keel below, and presents a Y-shaped section, 

 situated some distance above the palatine bones. The turbinal 

 bones seen are the posterior parts of the maxillo-turbinals. 



Text-fig. 8. 



jnc/al 



pixrysf- 



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 foinvard, so that 

 the thii-d molar teeth, the hamitlar processes of the pterygoid bones, 



