Mollusca front the Bokkeceld Beds. 269- 



and nearly as wide as the shell ; the beak is situated at about the 

 anterior fourth of the transverse diameter, and the anterior end in 

 front of it is rounded. 



Dimensions. — Length 10 mm; height 7 mm. 



Locality.— (No. 122) Top of Hottentot's Kloof. 



AXODOXTOPSIS? EUDIS, Sharpe. 



1856. Anodontopsis * rudis, Sharpe, Trans. Geol. Soc, ser. 2^ 

 vol. vii., p. 213, pi. xxvii., fig. 10. 



The description of this species, based on one imperfect specimen, 

 was given by Sharpe as follows : " Shell nearly square : beaks 

 central : anterior side slightly truncated near the beak : posterior 

 side nearly straight : a slight depression down the middle of each 

 valve, reaching to the ventral margin : valves wrinkled with irregular 

 concentric lines of growth. Length If inches ; breadth 1| inches ; 

 thickness fths of an inch." 



The shell is rather more quadrate in shape than Sharpe's figure 

 represents ; the ventral margin is nearly straight, and the median 

 depression is very faint, broad and shallow. The beaks are sub- 

 central, being rather nearer the anterior than the posterior margin. 

 The true generic position of this species, based on a single specimen, 

 must be left doubtful, but it may, perhaps, belong to the genus 

 Tcechonuja, for it bears some resemblance in shape to the species 

 T. rathhuni, Clarke," from the Devonian of the Eio Maecuru, Brazil. 



Locality. — Leo Hoek (Leeuwen Fontein, Warm Bokkeveld). 



Conclusion. 



The evidence of the Mollusca points the same way as that of 

 the Brachiopoda, and emphasises still more strongly the affinities of 

 the fauna with that of the American Continent. Katzer j has 

 remarked on the faunistic relations of the Devonian of the Lower 

 Amazon with the Hamilton Group of North America, and practically 

 the same degree of affinity is noticeable in the case of the Bokkeveld 

 Mollusca and Brachiopoda. 



When the fauna is reviewed as a whole in conjunction with the 

 stratigraphical relations of the beds which yield the fossils, it may be 

 found possible to recognise two horizons in the Bokkeveld Beds, as 

 Katzer has done in South America. 



* Clarke, op. cit., p. 57, pi. viii., figs. 23, 24. 

 t Katzer, oi>. cit., pp. 188 and 242. 



