200 PALEONTOLOGY OF KENTUCKY. 



Surface marked by distinct, rather strong, somewhat lamellose lines of 

 growth. Prof. Hall expected that this species might not really belong to the 

 genus Tellinomya, and proposed for it the name of Dystactella, but placed it 

 afterwards with Clinopistha. 



Formation and Locality. In the chert beds overlying the hydraulic limestone in Jefferson county, 

 Ky., and in Clark county, Ind. 



Clinopistha antiqua. MEEK. 



Plate IV., figures 9, 10 and 11. 



Clinopistha antiqua. Meek. Proc. Acad. Nat. Sci. Phil. 1871. 

 Clinopistha antigua, Meek. Geol. of Ohio. Pal., Vol. 1, p, 208 1873. 



Shell transversely sub-oval, regularly and moderately convex ; height two- 

 thirds of the length, and depth one-half of height ; anterior end regularly 

 rounded ; posterior extremity only one-half as high as the anterior one, nar- 

 rowly rounded, and most prominent below ; basal margin almost straight, or a 

 little inflated or slightly convex, and curving abruptly upwards at the ex- 

 tremities; beaks depressed nearly or quite to the dorsal outline, small and 

 closely appressed, and placed at five-eighths of the whole length of the shell 

 from its anterior end ; dorsal line near the beaks parallel with basal margin, 

 but curving regularly into the anterior margin. 



Surface shows fine concentric lines of growth, but no other markings. The 

 specimen illustrated is of average size and form. I place this shell with 

 Meek's species, though my specimens are more elongate and less gibbous than 

 his. 



Formation 'and Locality. In the chert beds superimposed upon the hydraulic limestone of the De- 

 vonian formation, in Jefferson county, Ky., and Clark county, Ind. 



Clinopistha striata. N. SP. 



Plate IV., figures 1 and 2. 



Shell of medium size, transversely sub-elliptical ; length not quite twice the 

 width or height, and thickness about one-half the height; beaks small and 

 closely appressed, in the level of dorsal margin, and situated about two-thirds 

 of the whole length from anterior extremity ; basal margin slightly convex in 

 its central half, but curving regularly but rapidly into the terminal margins. 

 Dorsal margin straight and almost parallel with the central portion of the 

 basal one ; at its anterior end it curves down into the anterior margin, which 

 appears to be regularly rounded ; posterior end slopes down from the beaks to 

 a somewhat pointed posterior extremity, which is most prominent a little below 

 middle height of the shell ; both valves are moderately convex, 



