TRANSACTIONS OF WAGNER 

 IAOO 



TERTIARY FAUNA OF FLORIDA 



The horizon appears to be a little higher than the Tampa silex beds and equiva- 

 lent to the Tampa limestone, a fact demonstrated by the researches of Mr. T. 

 W. Vaughan of the United States Geological Survey.* 



Chama corticosa Conrad. 



Chama corticosa Conrad, Am. Journ. Sci., xxiii., p. 341, 1833; Fos. Medial Tert., p. 32, 

 pi. xvii., fig. 3, 1838 ; Tuomey and Holmes, Pleioc. Fos. S. Car., p. 22, pi. vii., figs, 

 i, 2, 3, 1855; Emmons, Geol. Rep. N. Car., p. 288, fig. 210, 1858; Conrad, Proc. Acad. 

 Nat. Sci. Phila. for 1863, p. 576, 1864; Meek, Checkl. Miocene Fos. N. Am., p. 8, 

 1864. 



Miocene of the James River, Virginia (type locality) ; of the York River 

 near Yorktown, Harris ; of Petersburg, Burns ; of the Darlington district, 

 South Carolina, Tuomey and Burns. 



This is a large, rather rude species attached by the right valve, with crenu- 

 late inner margins and radially striated, rather closely appressed, concentric 

 lamellation. The average diameter is about fifty-five millimetres. 



Chama congregate, Conrad. 

 Chama congregata Conrad, Am. Journ. Sci., xxiii., p. 341, 1833 ; Fos. Medial Tert., p. 32, 



pi. xvii., fig. 2, 1838; Tuomey and Holmes, Pleioc. Fos. S. Car., p. 23, pi. vii., figs. 



7 to 10, 1855 ; Conrad, Proc. Acad. Nat. Sci. Phila. for 1863, p. 576, 1864 ; Whitfield, 



Miocene Moll. N. J., p. 65, pi. ix., figs. 14-18, 1895. 

 / 'Chama foliacea Gmelin, Syst. Nat., vi., p. 3304, 1792; after Lister, t. 215, f. 51. 



Miocene of Shiloh and Jericho, Cumberland County, New Jersey, Burns ; 

 of Plum Point and Church Hill, Maryland ; of the York and James Rivers, of 

 Petersburg and Dinwiddie, and Prince George County, Virginia; of South 

 Carolina near Darlington ; of Florida at De Leon Springs, Jackson Bluff, and 

 sixteen miles southwest of Tallahassee ; also recent on the coast. 



This is a small, very plump species, rudely frilled and fluted on both valves, 

 the flutings on the free valve sometimes recurving as very short, close-set 



* It is well to state here that some of this limestone has long been in the National ! 

 Museum with the label " White limestone of Claiborne, Alabama," furnished by an emi- 

 nent paleontologist whose labels must in some way have got mixed. Several species in- 

 cluded in this work have been described from these casts and referred to Claiborne, 

 whereas they form a part of the Jacksonboro' fauna. Of these Mr. Vaughan by exam- 

 ining the collection has been able to make the following enumeration : Bulla petrosa 

 Conrad; Strombus albirupianus Dall (p. 174) ; Cerithium georgianum Lyell; Calyptroea 

 trochiformis Lamarck; Xenophora humilis Conrad; Amauropsis ocalana Dall (p. 377). 

 and Ampullina streptostoma Heilprin, besides others not specifically identified. 



