342 



Annals of the South African Museum. 



The maxillary part of the palate is complete on the right side. 

 It is 18 mm. long, and narrows slightly anteriorly. Between the 

 bases of the 1st. molars the palate, when complete, had a width of 

 26-5 mm., while at the point of junction of the maxilla with the 

 premaxilla the width was 22 mm. The alveolar part of the bone 

 which contains the roots of the molars is fairly massive, but the 

 palatal portion of the bone has a thickness of but 2 mm. 



In front of the maxilla a small palatal fragment of the premaxilla 

 is preserved, while posteriorly a section of the right palatine is seen 

 forming a vertical wall to the narial passages and curving downward 

 and inward to form part of the secondary palate, articulating on the 

 palatal surface with the maxilla. The vault of the palate is low, 

 being a flattened concavity. 



-V-N*. 



Fig. 7. Tritheledon riconoi, Br. 

 Palatal view of right maxilla. 



By placing the type specimen in its correct position with respect 

 to this fragment it is seen that in all probability the first molar 

 tooth on the type is in reality the second molar of the animal. 

 It would thus appear that this form lias 10 molars; for it is im- 

 probable that any are missing from the posterior part of the type, 

 the alveolar border of the maxilla thinning away rapidly behind the 

 last of the series displayed. 



All the vertebrae preserved are incomplete. The largest pro- 

 bably from the mid-dorsal region - - has a centrum 34 mm. long, 

 whose ends are 22 mm. high and 20 mm. broad. The ends of the 

 centra are slightly concave. The centra are regularly constricted, 

 the median width being 16 mm., and along the ventral surface is 

 a well-defined median longitudinal grove, which broadens at the two 

 ends. The centra are relatively longer than those of Cynognathus. 



