FAUNA OF ORTHAULAX PUGNAX ZONE. 143 



CARDIUM (TRACHYCARDIUM) BOWDENENSE Dall. 



Cardium muricatum Guppy, Geol. Mag., dec. 2. vol. 1, p. 450, 1874; not of 



Linnaeus, 1758. 

 Cardium {Trachycardium) howdenense Dall, Trans. Wagner Inst,, vol. 3, 



pt. 5, p. 1087, 1900. 



Oligocene of the Bowden beds, Jamaica, West Indies, and of the 

 Tampa silex beds at Ballast Point, Tampa Bay, Florida. U. S. 

 Nat. Mus. No. 165204. 



This species resembles C. muricatum in general characters and 

 has about the same number of ribs, but all its characters are as it 

 were in miniature ; the shell is smaller and all the details are smaller. 

 The true O. muricatum is more inflated proportionally and has the 

 ribs less crowded and compressed. Moreover, it does not appear as 

 a fossil earlier than the Pleistocene so far as known. 



CARDIUM (TRACHYCARDIUM) PARILE Dall. 

 Plate 4. fig. 6. 



Cardium (Trachycardhim) parUe Dall, Trans. Wagner Inst., vol. 3, pt. 5, 

 p. 1086, pi. 48, fig' 17. 1900. 



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

 of the lower bed at Alum Bluff, Chattahoochee Kiver; and of the 

 marls of the Chipola River near the county bridge, Calhoun Cotmty, 

 Florida. U. S. Nat. Mus. No. 165208. 



CARDIUM (TRACHYCARDIUM), spp. indet. 



Fragments of what appear to be two undetermined species of 

 Trachycardium have been found at Ballast Point, but not in a con- 

 dition to be named. 



Subgenus CERASTODERMA Morch. 



Cerastoderma Morch, Yoldi Cat., vol. 2, p. 34, 1853.— Roemer, Conchyl. 



Cabinet, ed. 2 (Ca/rdium), p. 4, 1868.— Meek, Pal. Upper Missouri, 



p. 166, 1876 ; C edule Linnaeus. 

 Cardium Gray, List Brit. Anim., p. 25, 1851 ; not of Lamarck, 1799. 

 Parvicardium Monterosato, Sin. Conch. Medit, p. 19, 1884. 

 Pectunculus Huddesford, in expl. to plate 13, of Lister, Conch, ed. of 1770. 



Sole example, Cardium edule. 



If the rules of nomenclature were strictly observed it may be that 

 the name Pectunculus might have to be adopted for the group 

 typified by Cardium edule, as his use of it is probably the earliest 

 binomial adoption of this name which was applied by the classic 

 writers to any rounded inflated bivalve. But this name has been 

 so much used for different groups of bivalves and has created so 

 much nomenclatorial confusion that, considering that Huddesford's 



