340 PALEONTOLOGY OF OHIO. 



it declines forward, with a straight or slightly sinuous outline above, and 

 rounds into the narrowly rounded front below ; beaks depressed to the 

 line of the dorsal margin, rather compressed, and placed about one-third 

 the length of the valves from the anterior end. Surface marked by con- 

 centric strias and some ridges of growth. 

 Length, 1.40 inches; height, 0.74 inch. 



I know nothing of the hinge and interior of this shell, and have, there- 

 fore, only referred it provisionally to the genus Solenomya. Possibly I 

 should call it Edmondia anodontoides, though it is quite as probable that 

 it will be found to belong to neither of these genera when its hinge 

 characters can be seen. 



Locality and position : From the Coal Measures, at Newark, Ohio. 



Genus ASTAETELLA, Hall, 1858. 



(Geol. Report Iowa, I., part II , 715.) 



AsTAKTELLA Newberryi, Meek. 



Plate 19, fig. 3. 

 Compare Astartella vera, Hall (1858), ib., pi. 29, figs. 1«, b. 



Shell of medium size, trapezoidal-subovate, being wider, anteriorly, 

 with height about. three-fourths the length, rather convex; anterior mar- 

 gin rounded; base longitudinally semiovate, being more convex in out- 

 line anteriorly, and a little sinuous behind; posterior side narrowed, and 

 nearly vertically truncated ; dorsal margin sloping and nearly straight 

 behind, declining more abruptly, with a more or less concave outline in 

 front ; beaks moderately prominent, located about one-third the length 

 of the valves from, the anterior margin; posterior umbonal slopes form- 

 ing an obtuse ridge that extends obliquely backward and downward to 

 the abruptly rounded posterior basal extremity ; above this ridge the 

 triangular posterior dorsal region is flattened and cuneate, while the 

 flanks just in advance of it are a little concave. Surface ornamented 

 by about twenty to twenty-five very regularly disposed, distinct, con- 

 centric, slender ridges, that are separated by wide, rounded furrows, in 

 which traces of very fine lines of growth may be seen by the aid of a 

 magnifier. 



Length, 0.63 inch; height, 0.51 inch ; convexity, about 0.24 inch. 



Of this form I have seen but a single very perfect left valve, and that 

 is so firmly and closely attached to the hard rock tba,t its lunule and 



