, sotrxH African THfiRocEtuALiAN reptiles. 355 



other known Theroceplialians, tliere are four openings. If the 

 anterior part of the palate be compared with tliat in Moscho- 

 rhiims, it will be seen that the difterence is that the anterior ends 

 of the palatines pas.s inwards, and meet the pre vomers dividing 

 what were large interiial nares into anterior and posterior 

 portions — the posterior alone being, as Haughton has suggested, 

 the internal nares. What lias happened is exactly comparable to 

 what has happened with the external nares in Ghamceleon, where 

 the original opening becomes divided into two by the prefrontal 

 passing forwards. 



Haughton discusses the affinities of Whaitsia with Thero- 

 ceplialians, Gorgonopsians, and Cynodonts, and inclines to regai'd 

 it as a highly specialised Gorgonopsian, but it seems to me that 

 it is a true but aberrant Therocephalian. 



References to lettering. 



Ang. Angular ; B.O. Basioccipital ; B.S. Basisplienoid ; Dent, Uentavy ; 

 JSg.F. Ectopterygoid or Traiispalatiiie ; Ep.P. Epipterygoid ; Fr. Frontal; Ju. 

 Jugal; M.v. Maxilla; JV^ci. Nasal ; OpO. Opisthotic or Paroccipital ; Pa. Parietal; 

 Fal. Palatine ; Pnuv. Premaxilla ; Fr¥. Prefrontal ; PoO. Postorbital ; Ft. 

 Pterygoid; P.Vo. Prevoiner ; Sm.v. Septomaxilla ; Sq. Squamosal; Vo=Pa.S. 

 Vomer=Parasplienoid. 



Phoo. Zool. Soc— 1920, No. XXlV 



24 



