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Annals of the Transvaal Museum 
the two genera. These differences have been specified in the preliminary 
description, but for the sake of completeness they will be recalled here. 
Broom writes about Rliinesuchus (5, p. 375) : “. . . and inside the 
maxilla lay the palatine with a large number of small teeth irregularly 
arranged, but roughly in three or four rows. The palatine teeth are 
considerably larger than those on the pterygoids and parasphenoid, but 
are only about one-third the size of those on the maxilla.” On p. 376, 
in his diagnosis of the genus Rliinesuchus : “ Inside of the maxillary 
teeth are large numbers of very small teeth, probably borne by the 
palatines, and covering much of the pterygoids, and continued across the 
back part of the parasphenoid.” 
From these two extracts we may conclude that the palatines of 
Rliinesuchus are covered with numerous small teeth roughly arranged in 
three or four rows. If this result is compared with the foregoing descrip- 
tion it will be seen that Myriodon differs from Rhinesuchus in the 
following facts : — 
Firstly, Myriodon has no small teeth on its palatines like Rliine- 
suchus. 
Secondly, Myriodon has one row of large teeth along the middle 
of its palatines, which row is absent in Rhinesuchus. 
As the knowledge of the teeth arrangements of the members of this 
group is sufficient for identification it will not be necessary to go further 
into the question. 
Measurements of Myriodon Senekalensis. 
Skull. 
Length of preserved portion 320 mm. 
Probable length of complete skull ...500 mm. 
Length of right interpterygoidal cavity 239 mm. 
Breadth of right interpterygoidal cavity... 100mm. 
Breadth of preserved portion of skull 332 mm. 
Vertebral column. 
Length of largest preserved portion 235 cm. 
Length of presacrai portion of same individual 
measured from front end of ischio-pubis 100 cm. 
Length of same in another individual 128 cm. 
The length of the largest individual is estimated at 375 cm. 
Sacral rib. 
Length 97 mm. 
Breadth of proximal end 40 mm. 
Breadth of distal end 30 mm. 
Episternum. 
Length as preserved 215 mm. 
Breadth may have been 260 mm. 
Clavicle. 
Length of cleithral end .100 mm. 
Breadth of ventral end at least 135 mm. 
Cleithrum. 
Length of preserved part 128 mm. 
Scapula-coracoid. 
Length of corocoidal portion 92 mm. 
Breadth of upper end 125 mm. 
