298 PALEONTOLOGY OF OHIO. 



sinus under the posterior ear, as well as in some of its less important 

 details. 



Locality and position : The specimens figured on our plate are from the Waverly 

 group of the Lower Carboniferous, at Newark, Ohio. Through the politeness of Prof. 

 A. Winchell, I was permitted to make tracings for comparison from drawings he has 

 prepared of this shell from the same horizon in Michigan. 



Genus PAL^ONEILO, Hall, 1870 ? 



(Prelim. Notice Lamellib. Upper Held., etc., 6.*) 



Paleoneilo Bedfordensis, Meek. 



Plate 15, figs. 3a, b, c. 



Shell subovate, compressed, or moderately convex, height more than 

 three-fourths the length, the highest point being in front of the middle ; 

 basal margin semiovate, most prominent antero-centrally, from near 

 which it ascends with a slightly straightened, oblique outline behind, 

 and rounds up oblique to the front ; posterior margin narrowly rounded, 

 and somewhat compressed; anterior side shorter and more broadly 

 rounded; dorsal margin arcuate, declining more abruptly in front of the 

 beaks, which are moderately prominent, and situated a little more than 

 one-third the length of the valves from the anterior margin. Surface 

 ornamented by very fine, regular, closely arranged concentric stria3, that 

 become obsolete on the posterior third of the valves. Oblique posterior 

 sulcus very faintly indicated, or entirely wanting. 



Length, 0.57 inch; height, 0.42 inch; convexity, about 0.14 inch. 



This species seems to be most nearly allied to P. brevis, from the New 

 York Chemung, but differs in not being " very ventricose," and in having 

 its lines of growth very regular, instead of " irregular." Like that 

 species, its oblique posterior sulcus or constriction is quite nearly obso- 

 lete. I have not seen its hinge clearly enough to be entirely sure that it 

 belongs to the group Palseoneilo; but from its crenate hinge margin, and 

 general form, it probably belongs to that genus. 



Locality and position : Bedford, Ohio. Bedford shale of the Waverly group. 



* I cite this paper here and elsewhere, with the above date, not because I know it 

 to have been properly published at the time, but because I have heard of a few copies 

 being sent out during the year 1870, one of which I have seen. Neither this copy, 

 nor, so far as I can learn, any of the others, had any title page or author's name at- 

 tached ; but it has been attributed to Prof. Hall in a notice published in the Ameri- 

 can Journal of Science and Arts. 



