OF DENISON UNIVERSITY. 
37 
Chonetes pulchella, Win. 
(Plate III, Fig. 14.) 
“Shell small, semi-circular ; hinge almost equalling the greatest 
width, rectangular at the extremeties, furnished with two or three stout 
hollow spines on each side of the beak, one projecting from the hinge 
extremity, and diverging at an angle of about 22° with the hinge-line 
— the second half way to the beak and diverging at an angle of 45°, 
each of these spines having a length equal to half the hinge line. 
Ventral valve, exclusive of the flattened hinge angles, spherically con- 
vex; internal median ridge extending to the middle of the valve. 
Surface with about 54 feeble, rounded ribs, often nearly obsolete on 
the hinge angles; these are crossed by numerous microscopic, concen- 
tric striae; the grooves beneath the ribs are acute and bear a few spin- 
ous projections near the shell margin. Dorsal valve nearly flat, gen- 
erally a little concave near the margin, marked, like its fellow, with 
radiating lines, and often a few concentric folds. Area very narrow, 
equally excavated in both valves.” 
Our specimens are 7 mm. wide and about 5 mm. long. Kindly 
identified by Prof Winchell. Specimens believed to have come from 
the free-stone of middle Waverly, Granville, O. 
Heinipronites crenistria, Phil. 
(Plates V, Fig. 14; III, 24; Plate VI, Fig. 8; Plate IX, Fig. 21.) 
The great variability of the American members of Hemipronites 
makes any attempt to restrict the limits of species very difficult — for 
us, impossible. The figures indicate the extremes of the series abun- 
dant in the middle Waverly. 
This widely distributed species occurs in all the strata containing 
numerous fossils. The largest specimens seen come from the same 
horizon as Spirifer marionensis, probably 60 feet below congl. I, though 
these are less than half the size of the largest figured by Davidson. 
(Sup. plate XXXVI.) These are very transverse and the striae are 
very fine and frequently irregular. The ventral valve is only moder- 
ately convex. (Dorsal valve 58 mm. wide, 30 mm. high) about 13 
striae in 5 mm., (near the margin.) In the shale below congl. I, sped- 
