FREE INSTITUTE OF SCIENCE 



781 



TERTIARY FAUNA OF FLORIDA 



1868). Placnnanoinia fragosa Conrad, from North Carolina, from the descrip- 

 tion may be referred to this group, but in the absence of any type or figure, 

 or even any exact locality for the species, it is impossible to be certain. An 

 unnamed species of the Chickasavvan (Harris, Bull. Pal. No. 9, p. 42, pi. 6, 

 fig. 10), if the scars are completely figured, should belong in this group. 



Genus ANOMIA (Linne) Miiller. 

 Anomia (pars) Linne, Syst. Nat., Ed. .\., p. 700, 1758. 



Anoinia Miiller, Prodr. Zool. Dan., pp. xxx., 248, 1776; Retzius, Diss., p. 9, 1788. 

 Echion + Echionoderina Poli, Test. Utr. Sicil., i., p. 34, and ii., p. 255, 1791. 

 Cepa (Hwass) Humphrey, Mus. Calon., p. 45, 1797. 



Fencstclla Bolten, Mus. Boltenianum, p. 193, 1798 ; Ed. ii., p. 134, 1819. 

 Anomya Agassiz, Monies des Moll., i., p. 23, 1839. 

 Diploschiza Conrad, Am. Journ. Conch., ii., pp. 77, 105, 1866. 

 Not A)tO!nia Da Costa, Elem. Conch., p. 292, pi. vi., figs. 3, 10, 1776; nor of Bolten, 



Mus. Bolt., p. 134, 1798 (Brachiopoda). 



The fossil species of this group are very difficult things to study, since 

 the lower valve is seldom preserved and the muscular impressions can seldom 

 be made out. I shall therefore refrain from consolidating doubtful species in 

 the absence of a sufficiency of material for thorough study. To the natural 

 difficulties is added that due to the fact that the sculpture in this genus is 

 very variable in perfectly normal specimens and is further complicated by the 

 differences of form and surface due to the object upon which they are sessile. 

 I have satisfied myself by the examination of a large number of recent speci- 

 mens belonging to a single species from a single locality that the relative 

 positions of the adductor and byssal scars on the left valve are not constant in 

 the same individual at all ages, and consequently that small differences of this 

 kind cannot safely be used as specific distinctions. The best character seems 

 to be the more minute surface sculpture when fully developed in normal 

 specimens. 



Anomia lisbonensis Aldrich. 

 Ano//iia ephippioidcs Gabb, var. lishoneiisis AXAr., Bull. Geol. Surv. Ala., i., p. 41, pi. 4, 



fig. 6, 1886. 



Claibornian Eocene at Lisbon Bluff, Alabama, Aldrich ; and in similar 

 horizons in Webster and Bienville Parishes and near Nachitoches and Mt. 

 Lebanon in Louisiana, Vaughan ; near Wheelock and in Lee County, Texas, 

 Singley and Johnson. 



This is a normally smooth, large species, with radiating bands of color on 



