On wine G-orgonopsian Skull*. r>()| 



long: and the small part which thp frontal plays in the orbital border, 

 considerably less than in (rorgonops. The postfrontal is of the shape 

 seen in Scymnognathus icltaifsi. There is no depression on the pre- 

 orbital surface. 



The parietals are excluded from the border of the post-temporal 

 fossa, but each sends a narrow process backwards to lie between the 

 squamosal and tabnlan 1 . 



The squamosal is partly lost, but it can be seen that its posterior 

 surface, at the articulation with the tabulale and paroccipital process, 

 is produced backwards to form a ridge the inner wall of the 



auditory groove - - as in Arclojis: and that on the outer side of this 

 ridge there is a. shallow vertical groove. 



The basicranium is very deep. The condyle is weathered away: 

 but the basisphenoid luhera. which are close together, lie directlv 

 below the occipital condyle. The median basisphenoidal keel is thin 

 and deep, lessening in depth anteriorly as it nears the level of the 

 pterygoid flanges. These lie below the postorhital bar. 



Very few features of the brain-case can he determined. The brain- 

 Ctivitv is small and shallow, the foramen magnum being hiuh up 

 in the skull. The I'enestra ovalis is large and low down. The epi- 

 pterygoid is a slender rod expanded dorsally: its lower end is not seen. 



As far as its features are discernible, therefore, the form shows 

 a mixture of primitive and more advanced characters - - some of the 

 latter being sufficiently pronounced to prevent us from considering 

 Galesuc/uis as ancestral to the forms of the succeeding zone such as 

 (jloryonopx or Arctopx. The primitive features are (1) the high, square 

 section of the snout, r2) the laterally directed orbits, (',}} the posterior 

 position of the pterygoid llanges. ( i) the sloping occiput. (5) the deep 

 basioccipital and ((>) the deep basisphenoidal tubera. More advanced 

 features are the lack of antorbital depression, the reduction in si/e 

 of the lachrymal, and the small part played by the fnmtals in the 

 formation of the supraorbital border. 



SCYLACOPS CAPKNSIS, Br. 

 1918. Broom. Ann. S. Afric. Mus. XII. I. p. S. 



In the type specimen described by Broom the basicranial region 

 of the skull is somewhat crushed: but in a skull obtained at Well- 

 wood, (iraalY Reinet by the Rev. .1. U. \Vhaits (S. A. Mus. Cat. 

 No. 3444) most of the details of this region are perfectly displayed. 

 The skull in question differs from the type in being somewhat 

 smaller, in having a slightly shorter snout and somewhat narrower 



