Bracliloporla from the Bokkeveld Beds. 167 



Ordee ATREMATA. 



Family LINGULID^. 



LINGULx\ aff. DENSA Hall. 



(Plate XX., figs. 1, 2.) 



There are some specimens of the genus Lingula from the " Top 

 of Hottentots' Kloof" (No. 120) and also from "above 3rd Sand- 

 stone, up-side of tunnel-siding, Hex Eiver Pass " (Nos. 123, 124). 

 The two specimens from the latter locality represent the cast and 

 impression of a brachial valve, while that from the former is merely 

 the impression of a pedicle valve. In shape the shell is somewhat 

 obovate, widening a little anteriorly and subtruncate in front ; the 

 length is about one and a half times the greatest breadth ; the beak 

 of the pedicle valve is moderately pointed, the sides meeting at an 

 angle of about 80° ; the brachial valve has a regularly rounded 

 umbonal margin, the beak being quite inconspicuous. The surface 

 of both valves is marked by fine concentric stria. 



Dimensions. — (No. 123) Brachial valve. Length 15'5 mm. ; width 

 (at front end) 10-5 mm. ; width (near beak) 8-5 mm. 



Affinities. — This species appears to be very closely allied to 

 L. densa Hall,* of the Hamilton Group in North America, and to 

 L. manni Hall,t of the Corniferous Limestone. Ulrich l compares 

 his Bolivian species L. coheni with L. densa Hall, but it appears to 

 be of a more oval shape than these from Cape Colony. 



Localities.— {No. 120) Top of Hottentots' Kloof. (Nos. 123, 124) 

 Above 3rd Sandstone, up-side of tunnel-siding, Hex Eiver Pass. 



LINGULA sp. 



(Plate XX., fig. 3.) 



There is one imperfect valve of a species of Lingula (No. 121) 

 which seems to be distinct from that allied to L. densa Hall. The 

 shape is broadly oval, the greatest width being across the middle ; 



* Hall, Palseont. N.Y., vol. iv., 18G7, p. 11, pi. ii., figs. 10, 11. 



t Hall, ibid., p. 6, pi. ii., fig. 3. 



\ Ulrich, Neues Jahrb. f. Miner., Arc, Beil. Bd. viii., 1893, p. 82, t. v., fig. 11. 



