66 Annals of tlie South African Museum. 



are probably on the splenial bone ; the median anterior part of the 

 parasphenoid is narrow." 



The following is a translation (the original paper is in Dutch) of 

 van Hoepen's description of the genus Myriodon : 



" Skull triangular, rounded in front, almost as long as broad. 

 Maxilla and dentary bear each a row of large, conical, pointed, 

 pleurodont, flattened teeth, becoming smaller posteriorly, probably 

 labyrinthodont in section. Within the row of maxillary teeth, 

 probably on the palatine, is a row of large teeth, similar to the 

 maxillary and dentary teeth. On the remaining bones of the palate 

 are large numbers of small teeth, of which the biggest is far smaller 

 than the large teeth already mentioned. Similar small teeth are 

 found on a ridge which runs along the row of teeth on the dentary." 

 Van Hoepen further says that his genus differs from Rliinesuclius 

 in that it has but one row of teeth on the palatine, and lacks the 

 small teeth on this bone. 



The fragment of skull upon which Broom based his description of 

 the palatine bone is in a crushed condition, and it is probable that 

 these supposed palatine teeth are on the prevomer. In the complete 

 skull of R. whaitsi which I describe in this paper there is a row of 

 medium-sized teeth lying on the inner border of the internal nares 

 which are almost certainly carried by the prevomer. I am unable 

 to find in the type fragments any justification for the statement, 

 " Inside of maxillary teeth are large numbers of very small teeth, 

 probably borne by palatines." The only fragments which show small 

 teeth are portions of the lower jaw, which bear the usual coronoidal 

 teeth lying internal to the larger teeth of the dentary. 



For these reasons the two genera must be grouped together under 

 the one generic name Rhinesuckus, Broom for which the following 

 short diagnosis may stand : 



" Medium-sized to large ternnospondylous Labyrinthodonts. 

 Skull triangular, rounded in front, median length slightly greater 

 than breadth. Eyes wholly in posterior half of skull. Otic notch 

 present. Bones of skull-roof complete. Maxillary and dentary 

 each carrying row of uniform teeth, slightly decreasing in size 

 posteriorly. Prevomer carrying one or more large tusks, a few 

 medium-sized teeth, and covered together with the major parts 

 of the parasphenoid and the pterygoid with minute denticles. 

 Palatine with row of teeth similar to those on maxilla. Small 

 transpalatiue with teeth present. Coronoid carries number of 

 denticles on upper surface." 



Besides having the eyes larger and set more nearly together, and 



