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19. On the Manus and Pes of Pareiasaurus. By E. BROOM, 



M.D., D.Sc., F.E.S.S.Af. 



THE South African Museum recently obtained a fair skeleton of a 

 large Pareiasaurus probably P. baini, Seeley, from Hottentot's 

 Eivier, through the kindness of Mr. Gordon. The specimen was 

 carefully removed by Mr. A. E. Walker, who succeeded in securing 

 one hind foot with the toes in nearly perfect condition, and one front 

 foot, which, though most of the toes are lost, has most of the carpus 

 preserved with the bones in undisturbed position. These most 

 welcome additions make our knowledge of the osteology of Pareia- 

 saurus almost complete. 



Though the carpus is not quite complete, sufficient of the elements 

 are found in contact to enable us to restore the whole carpus with 

 much probability. 



The radiale is by far the largest element of the carpus. It 

 measures 111 mm. in width, 72 mm. between the distal and 

 proximal surfaces, and 75 mm. between the palmar and dorsal 

 surfaces. It fits into and occupies nearly the whole of the distal end 

 of the radius. On the palmar surface there is developed a large 

 irregular boss which probably functioned as a heel to the manus and 

 bore the greater part of the weight. The outer side of the radiale 

 articulates with the intermedium and the 2nd centrale. 



The intermedium is a narrow little bone which lies partly between 

 the radiale and ulnare and partly between the radius and ulna. It 

 measures 80 mm. in length, about 40 mm. in thickness, and 48 mm. 

 between the palmar and dorsal surfaces. 



The ulnare is a small bone which when viewed from above 

 appears nearly circular. The upper surface is moderately flat and 

 the palmar irregularly rounded. The upper surface measures 67 mm. 

 in length and 58 mm. in width. The greatest thickness of the bone 

 is about 35 mm. 



The 2nd centrale is a small rounded bone which fits in between 

 the radiale, intermedium, ulnare, 4th carpale, 3rd carpale, and prob- 

 ably the 1st centrale. It measures on the upper surface 45 mm. 

 by 32 mm. 



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