TRANSACTIONS OF WAGNER 

 1076 



TERTIARY FAUNA OF FLORIDA 



Section Fulvia Gray. 



Fulvia Gray, Ann. Mag. N. Hist., 1853, p. 40. Type C. apertum Bruguiere; not Fulvia 

 H. and A. Adams, Fischer, etc. 



Shell globose, very thin, gaping behind, with fine radial threading ; anterior 

 part of shell minutely pustulate ; the right anterior laterals start from the 

 umbonal cavity, not from the hinge-plate, and the left cardinals, as in Papy- 

 ridea, are posterior to the right ones when interlocked ; the margin of the gape 

 is not serrate. 



The type of this section has been erroneously cited as C. buUatum L., 

 causing confusion. 



Subgenus LiEVICARDIUM Swainson. 



Lsvicardium Swainson, Mai., p. 373, 1840 ; H. and A. Adams, Gen. Rec. Moll., ii., p. 457, 



1857; Roemer, Conch. Cab., 2d ed. (Cardium) , p. 80, 1869. 

 Liocardium Morch, Yoldi Cat., ii., p. 35, 1853. Type Cardium norvegicum Spengler. 



Shell thin, oval, closed, middle of the valves smooth or feebly radially 

 sculptured, ends with a smooth area, hinge normal, but with the anterior 

 laterals springing from the umbonal cavity ; periostracum smooth. 



Section Pachycardium Conrad. 

 Pachycardium Conrad, Am. Journ. Conch., v., p. 96, 1870. Type C. Spillmani Conrad. 



Shell resembling Lcevicardiuni but very ponderous and with obsolete radial 

 sculpture on the posterior fourth of the shell, visible chiefly as serrations on 

 that part of the margin ; the remainder of the shell smooth, or in certain 

 abnormal specimens with irregular concentric wrinkles on the anterior aspect. 

 Cretaceous. 



Another Cretaceous form from Texas (Tucumcari) has the posterior end 

 of the shell truncate and somewhat impressed, as in Fragum medium L., but 

 shows the other characteristics of Pachycardium. 



Subgenus DISCORS Deshayes. 



Discors Deshayes, An. s. Vert, basin de Paris, i., pp.. 553, 569, 1858. Type C. subdiscors 



Orbigny. 

 Lyrocardium Meek, Pal. Upper Missouri, p. 173, 1876. Type C. lyratum Sowerby. 

 Amphicardium von Martens, 1880, fide Fischer. 

 Divaricardium DoIIfus and Dautzenberg, Feuille des Jeunes Nat., p. 95, 1886; C. dis- 



crepans Basterot. 



