Talmonbilo cabbonifera, sp. nov. 

 Pig. 1. 



[A left valve, a little incomplete at the postero-superior angle.] 



-K%, 



• 



[The same valve, showing the hinge-plate and escutcheon.] 

 Pig. 3. 



r 



[The sane specimen, showing the degree of incurvature of the umbo and 

 the dorso-ventral curve of the valve.] 



Note. —All the figures are of the natural size. 



