76 BULLEI'IISr OF THE LABORATORIES 



Graimnysia ventricosa, -Meek. 



Fine typical specimens are found in the Allorisrna layer below 

 conglomerate II, especially at Rushville. See Pal. O. Vol. II; also 

 doubtfully identified from the free-stone below this horizon, at Newark 

 and Granville. 



Graimnysia sp. 

 (Plate XII, Fig. 3,) 



This small species has somewhat the aspect of an Edmondia and 

 has not been carefully studied. From the nodules at Moot's run. 



Modiojnorjjha liyalea. H. ? 

 (Plate X, Fig. 4.) 



This identification is provisional. Our specimens are shorter and 

 have more the aspect of a Grammysia. The species was derived from 

 Granville, however, and the form here figured approaches it as nearly 

 as any seen. Freestone of mid(ile Waverly. 



Efhnondi a depressa, H. 

 (Plate VIII, Fig. 5) 



Shell thin, subquadrate, only moderately convex, umbones prom- 

 inent, beaks incurved, approximate, near the front margin. Hinge 

 line straight, equal to over one-third the entire length ; post umbonal 

 ridge rather prominent, extending to postero-ventral angle ; post-um- 

 bonal slope bisected by an indistinct ridge extending from the umbo; 

 pre-umbonal slope narrow ; posterior outline nearly straight, meeting 

 the hinge line at an angle of about ii i°, passing into the lower out- 

 line by an abrupt curve; lower line nearly parallel to the hinge, curv- 

 ing very rapidly to its junction with the rather straight front margin, 

 which makes nearly a right angle with the hinge. Surface covered 

 with fine concentric striae and coarser folds parallel to the margin. 



