TRANSACTIONS OF WAGNER 

 684 



TERTIARY FAUNA OF FLORIDA 



- The different names under which this gigantic oyster has been known 

 are seen to be founded chiefly on geographical reasons as soon as the types 

 are compared. The characters of the shell are all explainable by the effect 

 of age and situs, so far as they differ from one another. The figuring of a 

 typical specimen in Dana's Manual has generally been overlooked. The 

 typical 0. georgiana are the enormous senile specimens with shells ranging 

 to two feet long and three or four inches thick. The young and really more 

 normal specimens have been overlooked, though much more abundant, or 

 referred to other species, chiefly 0. virginica, from which they differ by their 

 more elongated, usually straight, deeply excavated cardinal area and the 

 absence of ribbing on the lower valve in most specimens. 



Ostrea georgiana, forma normalis. 

 O. wauricensis Gabb (ex parte), Journ. Acad. Nat. Sci. Phila., 2cl Ser., iv., p. 376, pi. 67, 



fig. 26, 1860. 

 O. Bourgeoisie Remond, Proc. Cal. Acad. Sci., p. 13, 1863 ; Gabb, Pal. Cal., ii., p. 33, 



pi. 1 1, fig. 57, 1869. 

 O. Tayloriana Gabb, Pal. Cal., ii., p. 34, pi. 12, fig. 60, 1869. 



Oligocene of Shell Bluff, Savannah River, Georgia; of Martin Station, 

 Florida ; White Sulphur Spring, Suwanee River, Hamilton County, Florida ; 

 six miles southwest of Gainesville, Alachua County, Florida; La Penotiere's 

 hammock, near Orient, Tampa, Florida; Nigger Sink, Newnansville; Devil's 

 Millhopper, near Hawthorne; Sullivan's old field, Levy County; Johnson's 

 Sink, Levy County; Magg's Springs, Alachua County; silex beds of Ballast 

 Point, Tampa Bay; Rock Bluff, Appalachicola River, Calhoun County; red 

 clay (so called Lafayette formation) over the Oak Grove marl, Santa Rosa 

 County, Florida, and lower bed at House Creek, Georgia. 



Lower Miocene marl of Shiloh and Jericho, Cumberland County, New 

 Jersey, and near Wilmington, North Carolina; Miocene of California and 

 New Mexico. 



It is not unlikely that to the above synonymy should be added 0. vclcn- 

 iana Conrad (a typographical error for helcniana) of the Mexican Boundary 

 Report, 1857, and the unrecognizable 0. panzana and 0. robitsta Conrad, 

 1857. 



The 0. Tryoni Gabb (1881), from the Miocene of Costa Rica, appears to 

 be a well-characterized species. 



The young 0. georgiana Conrad is the characteristic fossil of the Upper 

 Oligocene of the Gulf States often found in northern Florida scattered over 



