TRANSACTIONS OF WAGNER 

 1498 



TERTIARY FAUNA OF FLORIDA 



but there are no lateral teeth. There is a short, wide, angular pallial sinus, 

 more emphatic than in Coralliophaga, and in senile specimens this is radially 

 striated. The known species are Eocene. 



Trapezium claibornense Dall. 



PLATE 43, FIGURES 9, 10. 



Trapezium claibornense Dall, Trans. Wagner Inst., Hi., pt. v., p. 1199, pi. xliii., figs. 9, 10, 

 1900. 



Claiborne sands at Claiborne, Alabama. 



Shell small, subquadrate, subcompressed, inequilateral, with low, pointed 

 beaks at the anterior third; the anterior end rounded and rather attenuated, 

 the posterior broad and subtruncate ; disk covered with rather close, rounded, 

 concentric ribbing, obsolete on the umbones; hinge feeble, the teeth imper- 

 fectly developed, the cardinals obscure and the lateral feeble ; the pallial line 

 entire. Length 7.0, height 4.5, diameter 2.0 mm. 



This shell is evidently young and only the left valve was obtained. It is, 

 however, evidently a Trapezium, and of interest as showing the presence of that 

 genus in the Claiborne sands. 



To the typical Trapezium Lamarck united another form subsequently sepa- 

 rated by Blainville. 



Genus CORA T .T .TOPH AGA Blainville. 

 Coralliophaga Blainville, Man. Mai., p. 560, 1825. 

 Lithophagella Gray (MS.?) fide H. and A. Adams, 1857. 

 Cypricardia (sp.) Lamarck, 1819. 



The type is : 



Coralliophaga Coralliophaga Gmelin. 



Chama Coralliophaga Chemnitz, Conch. Cab., x., p. 359, pi. clxxii., figs. 1673-4, 1788. 

 Chama Coralliophaga Gmelin, Syst. Nat., p. 3305, No. 25, 1792. 

 Cardita dactylus Bruguiere, Diet. Sci. Nat. No. 13, p, 412; Encyc. Meth., pi. ccxxxiv., 



figs. 5a-b. 



Cypricardia Coralliophaga Lam., An. s. Vert., vi., p. 28, 1819. 

 Coralliophaga carditoidea Blainville, Man. Mai., p. 560, pi. Ixxvi., fig. 3, 1825; Reeve, 



Conch. Icon., pi. ii., fig. 12. 



Petricola carditoidea Sowerby, Conch. Man., p. 295, fig. xcii., 1842. 



Cypricardia Hornbeckiana Orbigny, Moll. Cubana, ii., p. 266, pi. xxvi., figs. 33, 34, 1846. 

 Cypricardia gracilis Shuttleworth, Journ. de Conchyl., v., p. 150, 1856. 



Pliocene of the Caloosahatchie River, Florida, Dall and Griffith; Pleisto- 



