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Fig. 6. 



Fig. 6. Neural valve of Waldheimia flavescens. /, foramen ; t, teeth ; d, del- 

 tidium ; ff, single adductor scar ; r, cardinal muscle scar ; x, accessory muscle 

 scar ; p, pedicel muscle scar ; z, pedicel attachment. 



Fig. 7. Haemal valve of the same. /, cardinal process ; t', dental sockets ;, 

 p hinge plate ; s, septum ; c, crura ; /, neural loop ; ??!, adductor scars. 



Fig. 9. 



Figs. 8 and 9. Side and neural views of the animal of Waldheimia flavescens 

 in the shell. 



Type. Waldheimia flavescens. 



T. flavescens., Val. apud Lam., Anim. sans Yert. v, vii, p. 330. 

 live., Conch. Iconica, pi. i and pi. ii a, b. 



Terehratula de^itata, Va\. 



Terehratula austraUs, Q. and G. 



Terehratula recurva, Q. and G. 



Waldheimia australis, King, Mon. Perm. Foss. p. 145. Da- 

 vids. Int. Br. Foss. Brach. p. 65, pi. vi, fig. 9, 10. 



JTab. Australia. Smithsonian Cab. 17814. 



Most of the specimens of this species are radiately ribbed ; 

 some, however, are quite smooth, especially the smaller speci- 

 mens. 



IrT the latter the foramen is barely complete. There are con- 

 siderable variations in the amount of inflation, and the form va- 

 ries from ovate to transverse. 



