APPENDIX. 
9 
perfection at Snow Hill. The genus is common to the Senonian strata in 
America, Europe and Southern India. 
(EHE. Conrad. 
Shell with the hinge of the left valve having one long oblique cardinal 
tooth projecting below the hinge margin, and a minute tooth posteriorly ; 
right valve unknown. 
(E. plana , pi. 1, fig. 17. Shell subtriangular, slightly folded ; right 
valve flat, umbonal slope snbangular, post-umbonal slope with minute 
radiating- lines granulated behind the umbo and on the submargin ; disk 
sculptured with very minute concentric close impressed lines ; basal mar- 
gin subrectilinear. (Tellinidre.) 
LINE ARIA. Conrad. 
SUBGENUS LIOTHYRIS. 
Yalves smooth, slightly bent. 
L. Carolinensis, pi. 1, fig. 20, 23, 24. Shell subovate, convex ; beaks 
situated behind the middle; umbonal slope undefined; anterior end 
acutely rounded, posterior end truncated, direct. 
Although the exterior of this shell is very unlike that of the typical 
sculptured species of Linearia, the hinge character is identical. {Tel- 
linidos.) 
Y A LED A . Conrad. 
Y. lintea, pi. 1, fig. 26. Large and perfect specimens of this shell 
enabled me to distinguish the difference between this genus and Cym- 
bophora, Gabb {Mactridi e.) 
C'YPRIMERIA. Conrad. 
C. depressa. Conrad. Single valves of this shell are exceedingly 
abundant at Snow Hill. They are generally more or less water-worn, but 
perfect specimens, with united valves occur sparingly. All the shells of 
this deposit indicate an open ocean with a shore at no great distance 
where weathered beach shells w r ere abundantly deposited among a com- 
paratively few living specimens. The genus is eminently characteristic of 
the Ripley group and next to Axincea congesta , the present species is the 
most common shell at Snow Hill. 
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