S8 
BULLETIN OF THE LABORATORIES 
in our collections from the nodule layer at Moods run. Our largest 
specimen agrees in all preserved characters with the species quoted 
doubtfully as P. shumardianus The opposite valve is more nearly 
flat and was poorly preserved. The great vertical. range of this group 
as well as the perplexing relations of the genera Pernopecten and En- 
tolium make it difhcult to base conclusions upon their distribution. 
Compare Bulletin Denison University, Vol. II, p. 23. 
P ter inop ecten cariniferus, sp. n. 
(Plate XII, Figs. 8-9, 42.) 
\ 
Shell small, sub-rhomboidal, slightly oblique; greatest length (of 
body) below or at about the middle of the valve ; length from one 
and oneTourth to one and one-fifth the lieight; lower margin nearly 
even elliptical curve, becoming rather rapidly flexed behind till its di- 
rection makes a little more than a right angle with the hinge, which it 
meets by a gentle outward curve ; anterior margin abruptly curved 
above the middle, forming an angle of about 45° with the hinge, to 
the deep byssal sinus. Right valve slightly convex ; hinge-line straight 
longer than the body, acute at both extremities ; beaks low, situated 
at about the anterior one-third ; posterior ear or wing large, triangu- 
lar, depressed, but not distinctly outlined from the valve, anterior ear 
acute, produced. Left valve more convex ; beak slightly projecting ; 
surface marked by regular distant radiating fibs and distant concentric 
folds, producing a pretty cancellation. The radiating markings of the 
right valve are less conspicuous. 
This species has a distinct Devonian habit. Nodules in shale at 
Moot’s run, 4j^ miles west of Granville. 
The right valve is very like some states of Pterinopecten vertum- 
nis. The resemblance is close to Pt. exfoliatus, but the ear is too 
small in that species. 
Pteronites {Leptodssma) ? ohliquus, sp. n. 
. (Plate VII, Fig. 7; Plate IV, Figs. 20.) 
I 
A very oblique species occuring in the free-stone of the middle 
Waverly may be recognized by its great obliquity and convexity. The 
