TRANSACTIONS OF WAGNER 

 680 



TERTIARY FAUNA OF FLORIDA 



Virginia, Fort Washington, Virginia, in the North Carolina Kocenc, and that 

 of Bell's Landing, Alabama ; a variety alepidota, without raised lamellae 

 externally but with radial grooves, is noted from Aquia Creek and the South 

 Carolina Eocene. 



Oligocene: of the lower bed at Alum Bluff, Florida. 



Miocene : of the upper bed at Alum Bluff, Florida ; of Grove, St. Thomas, 

 Cooper River, and Darlington, South Carolina; Snow Hill and Duplin 

 County, North Carolina; Grove Wharf, James River, and the Nansemond 

 River, near Suffolk, Virginia, and Imlaytown, New Jersey. 



Pliocene : of Peace Creek, near Arcadia, Florida ? 



This well-known shell, though not exceptionally variable, has had many 

 names. A specimen of Gryphcza mutabilis Mort, given by Dr. Morton to 

 Dr. Lea and agreeing precisely with Morton's figure and description, is simply 

 a somewhat worn, smoothish specimen of this species. There is little or no 

 uncertainty about the other synonymes. 



It is first distinctly noted in the upper bed at Bell's Landing, Alabama, 

 in the Chickasawan series, whence it occurs through the Eocene, Oligocene, 

 Lower and Upper Miocene, and even, if one or two rather poor specimens 

 can be referred to it, in the Pliocene sands of south Florida. These last may 

 be Miocene redeposited. The specimens from Virginia which grew under 

 advantageous circumstances are often widely alate with much elevated, 

 elegantly fluted concentric lamellae. The average specimen, however, has 

 uch less prominent alas and imbrications. Comparatively smooth specimens 



^\ 



are very close to 0. trigonalis. 



Ostrea thirsae Gabb. 



Gryphcfa thirsa Gabb, Proc. Acad. Nat. Sci. Phila. for 1861, p. 329. 



Ostrea thirsce Heilprin, Ann. Rep. U. S. Geol. Surv. for 1883, p. 311, pi. 63, figs. 4, 5, 6, 

 1884. 



Eocene of the lower Chickasawan series at Nanafalia Bluff, Tombigbee 

 River, and at Eufaula, Alabama. 



This appears to be a well-marked species, smooth with hardly any 

 tendency to plication, almost nautiloid in form, and belonging to the same 

 group as the next species. 



Ostrea Johnsoni Alclrich. 

 O. Johnsoni Aldr., Geol. Surv. Ala., Bull, p. 41, pi. 6, fig. 6, 1886. 



Lower Claibornian Eocene of the Monroe County, Alabama, calcareous 



