156 



ON THE SKULL OP THE GIRAFFE. 



[Jan. 19, 



which is largely filled up by the ethmo-turbinal bones shown in 

 the centre of text-fig. 7 (p. 153). As in the two previous figures, 

 the vomer exhibits a ti-ough on its upper surface ; its lateral 

 projections enter into relation with the lowermost parts of the 

 frontal bones as well as with the upper edges of the palatines. A 

 small process of the maxilla extends backwards along the inner face 

 of the jugal, and this process, although concealed by the jugal bone 

 in text-fig. 4, is seen in section in text-fig. 7. 



Two views are given of the skull cut in the direction of the line 

 4 in text-fig. 4, one (text-fig. 8, p. 154) looking forward, and the 

 other (text-fig. 9, p. 155) looking backward. The plane of section 

 passes obliquely down the front part of the paired horns, so as to 

 include the summit of the fronto-parietal vacuity on each side. 

 In text-fig. 8 are seen the bony partitions that incompletely divide 

 the great fronto-parietal sinuses, a,nd it will be noticed that these 

 partitions are unsymmetrically disposed on the two sides. The 



Text-fi2-. 10. 



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pHr. 



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par. 



tjiiip. 



I( t Vl.fUf. 



View, looking backwards, of the skull cut in the direction of the line 5 in text-fig. 4. 

 One-third (linear) of the natural size. 



relatively small cranial cavity shows the cribriform plates in the 

 distance. The section passes through the basisphenoid and 

 alisphenoid bones, and the pterygoid bones (not their hamular 

 processes) are seen in the distance flanking the inner surfaces of 

 the lower wings of the alisphenoid bones. The zygomatic process 

 of the squamosal is cut immediately behind the hindermost part 

 of the jugal, but in the distance the jugal is seen rising behind 

 the orbit to enter into extensive satural connection with the post- 

 oi'bital process of the frontal. The backward view seen in text- 

 fig. 9 (p. 155) differs fi-oin the forward view of text-fig. 8 (p. 154) 

 only in that in the distance ai-e seen the upper pai'ts of the paired 



