142 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Cardium Muller, Zool. Dan. Prodr., p. 246, 1776. — Bolten, Mus. Bolten- 

 ianum, ed. 1, p. 189, 1798 ; ed. 2, pp. 132-34. 1819.— Bruguiere, Encycl. 

 Meth., vol. 1, pp. 203, 235, 1789. — Lamarck, Prodrome, p. 86, 1799, sole 

 example, C. aculeatum Linnaeus. — Dall, Trans. Wagner Inst., vol. 3, 

 pt 5, p. 1069, 1900. 



Subgenus TRACHYCARDIUM Morch. 



Trachycardium Morch, Yoldi Cat., vol. 2, p. 34, 1853. Type, C isocardia 



Linnaeus. 

 Qranocardium Gabb, Pal. Cal., vol. 2, p. 266, 1868, G. saMlosum Gabb. 



CARDIUM (TRACHYCARDIUM) DELPHICUM Dall. 



Plate 25, fig. 12. 



Cardium (Trachycardium) delphicum Dall, Trans. Wagner lust., vol. 3, 

 pt. 5, p. 1084, pi. 48, fig. 18, 1900. 



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

 and of the Oak Grove sands, Oak Grove, Santa Rosa County, 

 Florida. U. S. Nat. Mus. No. 157526. 



The type of the species is the Oak Grove fossil ; those supposed to 

 be specifically the same from the silex beds are poorly preserved and 

 are referred to this species with some doubt. 



The figure is taken from an Oak Grove specimen. 



CARDIUM (TRACHYCARDIUM) PROPECILIARE Dall. 



Plate 18, fig. 7. 



Cardium propeciliare Dall, Trans. Wagner lust., voL 3, pt. 5, p. 1080, pi. 

 48, fig. 12, 1900. 



Tamf)a silex beds at Ballast Point, Tampa Bay, and in the Oli- 

 gocene marl of the Chipola Eiver, Calhoun County, Florida. Post 

 and Dall. U. S. Nat. Mus. No. 165205. 



CARDIUM (TRACHYCARDIUM) CESTUM Dall. 

 Plate 4, fig. 13. 



Cardium {Trachycardium) cesium Dall, Trans. Wagner Inst., vol. 3, pt. 5, 

 p. 1083, pi. 48, fig. 14, 1900. 



Tampa silex beds, at Ballast Point, Tampa Bay, and in the Oli- 

 gocene marl of the Chipola River, Calhoun County, Florida. Post 

 and Burns. U. S. Nat. Mus. No. 165206. 



This profusely ornamented species was fiirst found at Chipola, but 

 later Mr. Post sent specimens from the silex beds which proved to be 

 identical though in less perfect condition. 



