TRANSACTIONS OF WAGNER 

 854 



TERTIARY FAUNA OK FLORIDA 



upper bed at Alum Bluff, Chattahoochee River, Florida; also in the Pliocene 

 of the Waccamaw River, South Carolina, at Tilly's Lake. 



In describing this species, by a typographical error it was referred to 

 figure 3, plate 13, which represents C. cuneata. Conrad, with his usual care- 

 lessness, not only did not detect this error, but figured in the Medial Tertiary 

 by the side of a copy of Say's figure of cuneata what seems to be the left 

 view of a specimen of incequalis, and connected them by a dotted line, as if 

 they were the same species. It is only necessary to read the descriptions 

 carefully in connection with a series of the shells to see the blunder. 



This is the commonest of our Miocene species, identifiable by its short, 

 high form, unequal valves, and coarse, irregular undulations. It is rather 

 variable, and the undulations sometimes become obsolete, leaving only the 

 incremental striae, but the totality of characters will usually leave little dif- 

 ficulty in identifying it. . 



Corbula (Cuneocorbula) cuneata Say. 



Corbula cuneata Say, Journ. Acad. Nat. Sci., iv., p. 152, pi. 13, fig. 3, 1824. 

 Corbula ina-quale Conrad, Fos. Med. Tert., p. 6, pi. 3, fig. 3 (left hand one), l84o(diagn. 



and remarks excluded). 



Not C. cuneata Tuomey and Holmes, Pleioc. Fos. S. Car., p. 75, pi. 20, fig. 11, 1855; 

 nor of Emmons, Geol. N. Car., p. 290, fig. 2157?, 1858; nor of Hinds, 1844; nor 

 Conrad (Anisothyris), 1870. 



Miocene of Maryland, on the Choptank River; of Virginia, on the York 

 River; of the Natural Well and Magnolia, Duplin County, North Carolina; of 

 Darlington, South Carolina; Pliocene of the Caloosahatchie River, Florida (rare). 

 In this case, as in the preceding, Conrad, while copying the diagnosis, 

 transposed the figures. Emmons's figure represents a different species, more 

 like C. nasuta Conrad, and the figure of Tuomey and Holmes is probably 

 intended to represent C. contracta. 



C. cuneata Say has not been found in the recent state, and seems rather 

 rare everywhere. It is at once separable from the varieties of iiuzqnalis by its 

 nearly straight basal margin, its fine, even, concentric sculpture, and its sharp 

 rostral keel. 



Corbula (Cuneocorbula) subcontracta Whitfield. 



Corbula subcontracta Whitf., Fos. Mioc. Marls N. J., p. 88, pi. 15, figs. 11-14, '895. 

 Miocene marl of Shiloh, Cumberland County, New Jersey; Burns. 

 This is a small, cuneate species, with coarse, irregular undulations, quite 

 distinct from any of the other Miocene species. 



