356 



Annals of the South African Museum. 



The 2nd tarsale measures 38 mm. by 23 mm., and has a well- 

 marked dorsal surface. The 3rd tarsale is rather smaller, measuring 

 34 mm. by 22 mm., and the dorsal surface is reduced to a narrow 

 ridge. The 4th tarsale is 34 mm. by 18 mm., and has a small but 

 distinct dorsal surface. 



The following are the approximate measurements of the meta- 

 tarsals and phalanges. 



Length. 



1st metatarsal 



1st phalanx 22mm. 



Claw about 70 ,, 



2nd metatarsal 43 ,, 



1st phalanx 20 ,, 



2nd phalanx 13 ,, 



Claw about 60 ,, 



3rd metatarsal 52 ,, 



1st phalanx 23 ,, 



2nd phalanx about 13 ,, 



Claw 55 ,, 



4th metatarsal 60 , , 



1st phalanx 30 ,, 



2nd phalanx 20 ,, 



3rd phalanx 17 ,, 



Claw 38 



5th metatarsal 48 ,, 



1st phalanx 22 ,, 



2nd phalanx 17 ,, 



Claw . 28 



Prox. Width. 



60 mm . 



42 

 48 

 45 

 40 

 40 



43 

 45 

 40 

 40 

 43 

 40 

 42 

 38 

 32 

 35 

 29 

 27 

 20 ,, 

 22 



It is unfortunate that one cannot give with certainty the structure 

 of the tarsus. All we know for certain is that the proximal elements 

 are fused into a single bone and that there are a series of small 

 distal tarsals. The proximal bone certainly represents at least 

 the tibiale and fibulare, but whether there is or not an intermedium 

 must remain at present uncertain. From a comparison with the 

 condition in Procolophon I am inclined to think that the bone 

 represents the fused tibiale, fibulare, and intermedium. There are 

 pretty certainly 4 distal tarsals and probably a small centrale 



This foot removes any doubt there might have been as to the 

 digital formula of Pareiasaurus. In the British Museum specimen 

 the phalanges were so mixed that Seeley was unable to fix the 

 digital formula. Amalitsky has, in a photograph of one of the 



