164 Annals of the South African Museum. 



transition from one to the other taking place gradually by a regular 

 bending and not abruptly. There is no transverse ridge separating 

 the occiput from the parietal bar. 



The occiput is not well displayed and the sutures between the 

 bones are difficult of determination. There is, however, a large 

 tabulare lying outside the interparietal and articulating with the 

 squamosal and the supraoccipital. The occipital conclyle is large and 

 of the tripartite type. 



The articular surface for the lower jaw is not very much in advance 

 of the occipital condyle. It is very large, and although no suture can 

 be seen running across there is certainly a large quadrato-jugal 

 present. Between it and the quadrate on the anterior face of the 

 descending plate is a large oval foramen. 



The palate is long and comparatively narrow. There is no trans- 

 palatine. The jugal passes back within the maxilla to meet the 

 palatine, which articulates anteriorly with the maxilla. 



Type in American Museum of Natural History. 



Locality. Grootvlei (part of Paarde kraal), Beaufort West, C.P. 



Horizon. Lower Beaufort Beds. (Cistecejjhalus zone.) 



GENUS MYOSAURUS, gen. nov. 



MYOSAURUS GBACILIS, gen. et sp. nov. 



Two beautiful skulls form the co-types of this new genus. They 

 are of the same size and were obtained from Harrismith, O.F.S., in 

 the same calcareous nodule of Middle Beaufort age, in beds associated 

 with numerous Lystrosaurus skulls. The form is allied to Emydops, 

 but differs in being absolutely free of molar or canine teeth. 

 The following are the chief measurements : 



Greatest length (oblique) . 48 mm. 



Greatest width . . . 36 ,, 



Interorbital width . . 11 ,, 



Intel-temporal width . 17 ,, 



Length of orbit . 13 ,, 



Width of orbit . 12 



Snout to front of orbit (oblique) . . 12 ,, 



Width of palate . . 10 



Basal length . . . . 40 ,, 



The snout is feeble and narrow, and the nostrils are almost ter- 

 minal. They are close together and look practically wholly forwards. 

 At the front of the orbit the skull broadens rapidly. The orbit is 



