^8 BULLETIN OF THE LABORATORIES 



in our collections from the nodule layer at Moot's 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 difficult to base conclusions upon their distribution. 

 Compare Bulletin Denison University, Vol. II, p. 23. 



Pterinopecten cariniferus, sp. n._ 

 (Plate XII, Figs. 8-9, 42.) 



Shell small, subrhomboidal, slightly oblique; greatest length (of 

 body) below or at about the middle of the valve ; length from one 

 and one-fourth to one and one-fifth the height; 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 oudined from the valve, anterior ear 

 acute, produced. Left valve more convex ; beak slightly projecting ; 

 surface marked by regular distant radiating ribs 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, 4^ 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. 



Pteroriites iLeptoflesma) ? ohliquus, sp. n. 

 (Plate VII, Fig. 7; Plate IV, Figs. 20.) 



A very oblique species occuring in the free-stone of the middle 

 Waverly may be recognized by its great obliquity and convexity. The 



