OF DENISON UNIVERSITY. 
29 
gin slightly concave, front margin nearly straight, curved nearly equal- 
ly at either end ; umbo moderately prominent, beaks incurved over 
the anterior third ; surface evenly convex, post-umbonal slope with a 
slight secondary ridge, escutcheon and lunule well marked. Length, 
39 mm., height at beak, 24 mm. Flags below second fall at Cuyahoga 
river. 
This species resembles A. winchelli greatly but is much shorter 
proportionally and has a very different front margin. 
ALLORISMA CONSANGUINATtJS, Sp. n. 
(Plate XI, Fig. 13.) 
Shell rather under medium size, quadrately sub-elliptical, the 
length equal to twice the height, moderately convex ; posterior mar- 
gin obliquely truncate, short, abrubtly rounded below; front margin 
rather broadly rounded, greatest projection above the middle; ventral 
margin a broad gentle curve; hinge line nearly straight; umbo very 
prominent, beak near the anterior third ; post umbonal slope sulcate ; 
surface marked by very coarse, strong, concentric folds. 
The peculiarity which separates this from all other members of 
the genus in the Waverly is the narrowness of the posterior portion and 
the strongly concave post-umbonal surface. From A. winchelli, its 
nearest neighbor, it differs in the fuller and less acute curve of the an- 
terior, which sweeps upward nearly to the hinge. 
Shales over congl. IF Length, 25 mm., height at beak, 13 mm., 
height at posterior margin, 9 mm. 
LEIOPTERIA NASUTUS, Sp. n. 
(Plate XI, Fig. 30.) 
This species closely resembles L. ortoni and may best be describ- 
ed comparatively. The body is much more oblique and the posterior 
wing, therefore, much restricted, the anterior ear is prolonged and 
rounded at the extremity, beak behind the first third, acute, Length, 
10.5 mm., height, 6 mm. Bagdad, Medina county, apparently near- 
ly on the same horizon as L. ortoni. 
