364 A/ ban// MiiseKin Records. 



Rf'tiss/'iarn'a rplicta, no v. sp. 



PI. VII., Fig. 7. 



The specimen consists of the internal cast of the brachial valve, 

 showing the ril)s rounded and stroiigl3- marked, intercepted by 

 rings of growth, but fading out towards the hinge. The very dee)) 

 adductor scars show that the shell must have been very thick in 

 this region, and thus explaining the obliteration of the ribs on the 

 inside of the valve. Tli<^ number of the ribs is uncertain, but 

 sixtean can be counted on the left half, thus making the outer 

 shell to have had from 3t) to 40. There are distinct impressions 

 of the proximal part of the arms, commencing with a little knob 

 below and within the teeth sockets; thence there are radially diver- 

 gent ridges to near the middle of the adductor impressions, and 

 about a third of the depth of the valve from the uml)0 to the 

 margin ; here there is again a little knob showing the point where 

 the arms curvet^l forwards to form the lo()[). i'he adductor scars 

 are d vided by a strong median septum ; the diductor impression 

 on the hinge plate is also prominent. Hinge plate bilobed with 

 strong dental sockets at the outer corners for the reception of the 

 pedicle valve teeth. Shape of the valve almost cii'cular, but the 

 margin in the middle has been crushed inwards giving the shell a 

 rhynchoneliid form. 



Dimensions : Width, 15.4 cm. : depth 2.(S cm. 



Although the hinge jtlate and the shape of the shell differ 

 considerably from Reed's R. sp. «., the general characters are suffi- 

 cient to suggest that the two forms maj' be the same under differ- 

 ent conditions of preservation. 



Cat. No. 1>3. Donor: Mr. A. G. Bain. Locality, Warm Bokke- 

 veld. 



The specimen must have been in Mr. Bain's collection when 

 he sent the fossils to England which are desci-ibed by Messrs. 

 Sharpe and Salter in the Transactions of the Geological Society, 

 2nd series. Vol. VII, IcSaG. 



