MoUusca from tltr Bokkcveld Beds. 2o5 



Remarks. — There does not appear to be any closely allied 

 Devonian form of Cardiomorpha. Our specimen has its surface 

 somewhat injured and indented, which might mislead one as to its 

 true characters without careful examination. 



LocalU>/.—iNo. 102; Ezel Fontein, Ceres. 



PE.ECAKDIUM? sp. 

 (PI. XXXI., fig. 7.) 



There is one small right valve of a shell which may belong to 

 Pr(Beardiuin, Cardiola, or OpUthoccelus, but its state of preservation 

 and the lack of further specimens do not permit me to make a 

 closer approximation. The shell is ovate, rhomboidal, longer than 

 high ; the anterior end is abruptly truncate, nearly at right angles to 

 the cardinal line ; the basal margin is arched and passes into the 

 rounded posterior end; the cardinal line is straight. The beak is 

 small, pointed, anterior, directed forwards, with a small triangular 

 impressed ligamental ? area below it ; the surface is moderately 

 convex and is marked hy low radiating broad ribs, of which the four 

 or five running obliquely back from the beak are the largest and most 

 distinct ; the five or six smaller ones on the posterior (cardinal) slope 

 are inclined at an angle of about 20° to these, while beneath the Ijeak 

 the ribs seem nearly obsolete. 



Dlniemions. — Length 7 mm. ; height 5 mm. 



Localifi/.- — (No. 96) Gamka Poort. 



LEDA INORNATA, Sharpe. 



1856. Ledd inornata, Sharpe, Trans. Geol. Soc, ser. 2, vol. vii., 

 p. 212, pi. xxvii., fig. 5. 



The original description of this species given by Sharpe is as 

 follows: "Shell depressed, transversely lanceolato-ovate, very inequi- 

 lateral ; anterior end broad and rounded ; posterior end produced : 

 ventral margin regularly rounded : valves covered with fine concentric 

 lines of growth. Length f of an inch ; breadth l-J inches." 



Xo other example of this species has come under my notice, and 

 the figure of the type specimen gives one an excellent idea of the 

 ■ characters, so far as they can be made out. Lcda divcrsn, Hall,'-' 



* Hall, o)). (■//.. p. 329. pi. xlvii., tigs. 31-^7. 

 20 



