Pig. 

 1, Iff. 



4, 4 a. 

 5. 



C. 



7. 



PLATE IX, 



Cryptodeidus oxoniensis, Phillips, sp. ; occipital region of skull from 

 front (1), from behind (1 a) : two-thirds nat. size. [R. 2860.] 



Ditto ; basis cranii from below : two-thirds nat. size. [E. 2860,] 



Ditto ; right squamosal and quadrate : two-thirds nat. size. [R. 2860.] 



Ditto ; occipital region of skull of a young individual, from front (4) 

 and from behind (4 a) : two-thirds nat. size. [R. 2417.] 



Ditto ; basis cranii of a young individual from below : two-thirds nat. 

 size. [R, 2417.] 



Ditto ; mandible from above : two-thirds nat. size. [R. 2417.] 



Ditto ; crushed anterior portion of skull and mandible from below : 



Page 



166 

 166 

 167 



166 



166 

 167 



two-thirds nat. size. 



a., ampulla of posterior vertical semicircular 

 caual. 

 art., articular surface for quadrate. 

 hoc, basioccipital. 

 bsp., basisphenoid. 

 hsp.f., facet for union with, the basisphenoid. 



d., dentary bone. 

 ex.op., united esoccipital and opisthotic bones. 

 /., facet on hinder face of exoccipital, possibly 

 for pro-atlas. 

 for., median opening in basisphenoid of young 



individual. 

 A.c, channel for horizontal semicircular caual. 

 i.c.f., internal carotid foramen. 

 jucj., jugular foramen. 



[R. 3730.] 166-7 



l.p., lateral process of parietal. 

 pal., palatine. 

 par., parietal. 

 par.p., paroccipital process. 

 l^as., parasphenoid. 

 pitp; pterygoid (lateral) processes of basioccipital. 

 p.v.c, channel for posterior vertical semicircular 

 canal. 

 5., quadrate. 

 soc, supraoccipital. 

 spl., splenial. 



sq , zygomatic process of squamosal. 

 sq.' , parietal process of squamosal. 

 sym., symphysis of mandible. 

 XII., foramen for twelfth nerve. 



