Mollusca from the Bokkcceld Beds. 261 



NUCULITES, sp. 

 (PL XXXII. , fig. 3.) 



A much flattened and compressed imperfect right valve of a 

 species of Nucidites (No. 90) shows certain features which appear to 

 differentiate it from the others which have l)een described. In shape 

 it is subrhomboidal, ovate, but the margins are not well preserved. 

 The beak is situated at between one-third and one-half the length of 

 the shell, and there is a weak clavicular ridge from the beak curved 

 gently forwards and reaching more than half across the valve. A 

 regular concentric, rather coarse, lineation seems to ornament the 

 surface. 



Dimensions. — Length 30 mm. ; height about 21 mm. 



Affinities. — The great flatness of the valve may be principally due 

 to compression by crushing. The shape of the shell and course 

 of the clavicular ridge recall N. branncri, Clarke,''' but the beak in 

 the latter is rather more anteriorly placed. 



Locality. — (No. 90) Gydo Pass, near top, Ceres. 



PAL.EONEILO ANTIQUA (Sharpe). 



1856. S<)l('iicll(( aiitiqua, Sharpe, Trans. Geol. Soc, ser. 2, vol. vii., 

 p. 210, pi. xxvii., fig. 1. 



The description of this species as given by Sharpe is as follows : 

 •" Shell transversely ovate; anterior end broad, short, and rounded; 

 posterior end somewhat produced, broad with a small sinus near the 

 •dorsal margin : valves covered with fine concentric wrinkles : hinge- 

 hne slightly arched, with about ten small anterior and more than 

 twenty very small posterior teeth. Length 1^ inches ; breadth 2^ 

 inches ; thickness 1 inch." 



An examination of the type shows that the posterior end and sinus 

 near the dorsal margin are not quite so well preserved as indicated 

 in the figure, which is otherwise correct. 



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



PALiEONEILO RUDIS (Sharpe). 



1856. Solcnella rudis, Sharpe, Trans. Geol. Soc, ser. 2, vol. vii., 

 p. 211, pi. xxvii., fig. 6. 



The description of this species as given by Sharpe is as follows : 

 ■" Shell transversely rhomboido-ovate ; anterior end broad, sliort, and 

 * Clarke, op. cit., pi. viii., figs. 6-W, p. 73. 



