144 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



conception of the genus would probably have been synonymous with 

 CardiuTTh Linnaeus in its broad sense, it seems better to ignore this 

 instance of its use. 



Section DINOCARDIUM DaU. 



Dinocardium Dall, Trans. Wagner Inst., vol. 3, pt. 5, pp. 1074, 1097, 1900. 

 Tyi>e, Cardium robustum Solander (C. magnum Born not Linnaeus). 



CARDIUM (CERASTODERMA) PHLYCTAENA Dall. 

 Plate 25, fig. 10. 



Cardium (Cerastoderma) phlyctaena Dall, Trans. Wagner Inst., vol. 3, 

 pt. 5. p. 1097, pi. 48, fig. 13, 1900. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. Willcox 

 and Dall. U. S. Nat. Mus. No. 165207. 



CARDIUM (CERASTODERMA) TAPHRIUM Dall. 

 Plate 19, fig. 3. 



? Cardium (Cerastoderma) taphriiiin Dall, Trans. Wagner Inst., vol. 3, 

 pt. 5, p, 1098, pi. 40, fig. 9, 1900. 



Oligocene of the Tampa silex beds ? and of the Oak Grove sands 

 of Oak Grove, Santa Rosa County, Florida. U. S. Nat. Mus. No. 

 157576. 



The species and figure are based on Oak Grove specimens, the 

 pseudomorph from the silex beds being so poorly preserved that 

 identification is doubtful. 



Subgenus FRAGUM Bolten. 



Fragum Bolten, Mus. Boltenianum, ed. 1, p. 189, 1798; ed. 2, p. 131, 1819 

 (C tmedo Linnaeus). — Morch, Yoldi Cat, vol. 2, p. 35, 1853. — Dall, 

 Trans. Wagner Inst., vol. 3, pt. 5, p. 1074, 1900. 



Hemicardium Swain son, Mai., p. 373, 1840, after Cuvier, Regne Anim., 

 vol. 2, p. 479, 1817, emend. 



Bucardium Gray, Ami. Mag. Nat. Hist., 1853, p. 40 ; not of Megerle, 1811. 



Loxocardium Cossmann, Cat. lUustr., p. 160, 1887. 



Section TRIGONIOCARDIA Dall. 



Trigoniocardia Dall, Trans. Wagner Inst., vol. 3, pt. 5, p. 1075, 1900. Type, 

 Cardium graniferum Sowerby. 



CARDIUM (TRIGONIOCARDIA) ALICULA Dall. 



Plate 25, fig. 8. 



Cardium (Trigoniocardia) alicula Dall, Trans. Wagner Inst., vol. 3, pt. 5, 

 p. 1103, pi. 40, fig. 12 (only), 1900. 



Oligocene of the Tampa silex beds, Ballast Point, Tampa Bay, 

 and of the lower bed at Alum Bulff, Chattahoochee River, Florida. 

 Dall and Burns. U. S. Nat. Mus. No. 165209. 



