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15. On a New Species of Propappus, and on the Pose of the 

 Pareiasaurian Limbs. By E. BKOOM, M.A., D.Sc. 



(Plates XIX. XXI.) 



ABOUT a year ago Dr. A. W. Eogers, of the Cape Geological Com- 

 mission, discovered on the farm Hoedemakers Kraal, Beaufort West 

 district, much of the skeleton of a small species of Propappus.* The 

 skull and most of the anterior part of the vertebral column are 

 missing, and some of the limb bones are badly weathered, but a few 

 of the presacral vertebrae are beautifully preserved, while most of 

 the bones of the right fore and hind limbs are present in perfect 

 condition. There are also preserved large numbers of dermal 

 ossicles, and there can be little doubt that as in Propappus omocratus 

 the whole of the back and probably much of the sides of the animal 

 were protected. There seems some reason to believe that even the 

 limbs were protected by small dermal bones. The present specimen, 

 though manifestly belonging to the genus Propappus, differs from 

 P. omocratus, not only in being considerably smaller, but in a 

 number of important characters, and for it I propose the name 

 Propappus rogersi. 



Vertebra. 



The best-preserved vertebrae are a lower dorsal, possibly the 19th, 

 and two somewhat more anterior, possibly 13th and loth. 



The vertebra, which is evidently from the mid-dorsal region, and 

 may be the 13th, is the most perfectly preserved Pareiasaurian 

 vertebra that I have had an opportunity of examining. It agrees 

 pretty closely with the dorsal vertebrae of Pareiasaurus scrridens, 

 and also with those of Propappus omocratus, but differs in its 

 proportions. The greatest height of the vertebra is 135 mm. ; the 

 maximum width across the transverse processes 147 mm. ; and the 

 length of the centrum 50 mm. The spine is short, rising only 

 28 mm. above the curve formed by the posterior zygapophyses. 



* See Annual Keport of the Geological Commission for 1910, p. 18. 



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