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AMERICAN JOURNAL 



Fig. 6. 



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

 tidium ; a, single adductor scar : r, cardinal muscle scar ; a-, accessory muscle 

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



Fig. 7. Haemal valve of the same. /, cardinal process ; <^, dental sockets ; 

 p hinge plate ; s, septum ; c, crura ; Z, neural loop ; ?«, adductor scars. 



Fig. 9. 



Figs. 8 and 9. Side and neural views of the auimal of Waldheimia fiavescent 

 in the shell. 



Type. Waldhehnia flavescens. 



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

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



Terehratula dentata, Val. 



Terehratula austraUs, Q. and G. 



Terehratula recurva, Q. and G. 



Waldheimia aiistralis, King, jNIon. Perm. Foss. p. 145. Da- 

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



Ilab. Australia. Smithsonian Cab. 17814. 



Most of the specimens of this species are radiately ribbed ; 

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

 mens. 



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

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

 ries from ovate to transverse. 



