OF DENISON UNIVERSITY. 
29 
prominent. Surface marked by numerous close, minute, concentric 
lines, and numerous irregular, concentric wrinkles which give a pecu- 
liar appearance to the shell, not shared by other species. These 
wrinkles are less marked on young shells. There are also, in most 
cases, indications of radiating lines, which in the larger shells are 
strong striae or ribs, at a distance from each other. Length of mature 
specimen .70, width, a trifle less, hinge of right valve, .34. A very 
similar, or probably identical form, occurs in the Waverly, which may 
prove to bear a name ranking the one now proposed. 
Genus Lima. 
retifera, Shumard.- 
(Plate IV, Fig. 2^\ Plate V, Fig. 3.) 
Shell obliquely subovate; posterior side short; anterior side ob- 
liquely produced; cardinal border rather short; lower margin a nearly 
uniform curve ; anterior margin nearly equal, anterior one obtuse in 
outline, posterior ear rectangular; surface of valves marked by strong 
angular radiating costae and concentric striae. Height . c;o; length .70. 
Our specimens were, for the most part, very small, but otherwise 
agree with the description of this species, which is widely though not 
abundantly distributed. 
Roemer, in his paper entitled “ Ueber eine marine conchylien- 
Fauna im Steinkohlengebirge Oberschlesiens,” figures a little shell, 
very much like this, but somewhat less oblique He identifies it with 
a query, with Pecten interstitialis, Phillips. 
Genus Solenomya, ham? 
The generic reference is here very doubtful, d'wo of the forms 
are evidently closely allied, while the other might probably be more 
properly referred elsewhere, if we knew anything of its hinge. 
1 . Solei%oinya (?) anoclontoides , Meek. 
(Plate IV, Fig. TO.) 
This form agrees with Meek’s description and figures, except that 
the anterior margin is much less acute, that portion of the shell not 
extending into a heel-like prolongation below, as repiesented in his 
