Neio Fossils from tlie Bokkcvcld Beds. 399 



mens is 43 mm. and of the other 36 mm., and the height respectively 

 23 mm. and 22 mm. 



Genus ACTINOPTERIA Hall, 1883. 



ACTINOPTERIA aif. HUMBOLDTI Clarke. 



(PL XLVIII., fig. 3.) 



The distinction between A. liumholdti Clarke/'' and A. eschtvegei 

 Clarke, f consists, according to Clarke, in the former having "the 

 shell characteristically recm^ved at its posterior extremity, the 

 obliquity of the valves being notably greater, the wing much shorter, 

 the auricle smaller, and the surface ornamentation quite different." 

 Instead of having " numerous fine radiating striae which are coarsest 

 and alternate in size on the posterior slope," A. liumholdti has a 

 " few low, broad, indistinct and subequal ribs." In both cases con- 

 centric ridges, undulations, or striae are present as well. There is 

 one left valve from Gydo Pass, measuring 34 mm. in oblique length 

 and 22 mm. high, which more closely resembles A. liumholdti in the 

 above-mentioned characters than it does ^4. eschioegei ; the greater 

 obliquity, the shorter wing, the recurved posterior end (well marked 

 by the ribs), and the ornamentation are the features on which 

 reliance is placed. But the two species are undoubtedly closely 

 alhed. A. eschwegei has closer affinities with A. hoydi (Conr.) ; a 

 specimen allied to the latter has been previously described by the 

 author from the Bokkeveld Beds.| 



BRACHIOPODA. 



Genus SPIEIFER Sowerby, 1815. 



SPIRIPER ORBIGNYI Morris and Sharpe. 



The reasons for considering Sp. antarcticus (Sharpe) to be 

 synonymous with S^). orbignyi were given by the author in some 

 detail on a previous occasion. § Schwarz j] subsequently maintained 



* Clarke, op. cit., p. 47, pi. v., figs. 3, 7, 11, 12. 



t Ibid., p. 4.5, pi. v., figs. 1, 2, 4, 5, 6, 8, 9, 10 ; Thomas, Zeitschr. deut. geoi. 

 Gesell., Ivii., 1905, p. 257, t. xiii., fig. 29. 



I Reed, Ann. S. Afr. Mus., vol. iv., pt. vi., p. 266, pi. xxxii., fig. 9. 

 § Eeed, Ann. S. Afr. Mus., vol. iv., pt. iii.. No. 7, pp. 180-183. 



II Schwarz, Eecords of the Albany Museum, vol. i.. No. vi., 1906, pp. 367-375. 



31 



