666 SYSTEMATIC PALEONTOLOGY 



Georgia ; Eufaula, Alabama ; Union and Tippah counties, Mississippi. 

 Extreme top of zone, Pataula Creek, Georgia; Chattahoochee River, Ala- 

 bama. 



C AUDI I'M SPILLMAXI Conrad 



Cardium (Leevicardium) spillmani Conrad, 1858, Jour. Acad. Nat. Sci., Phila., 



2d ser., vol. iii, p. 326, pi. xxxiv, fig. 3. 

 Cardium (Liocardium) spillmani Meek, 1864, Check List Inv. Fossils N. A., 



Cret. and Jur., p. 13. 

 Cardium (Protocardium) perelongatum Whitfield, 1885, Mon. U. S. Geol. 



Survey, vol. ix, p. 136, pi. xx, figs. 20-22; pi. xxi, figs. 4, 5. 

 Pachycardium burlingtonense Whitfield, 1885, Ibidem, p. 138, pi. xxi, figs. 6, 7. 

 Cardium (Lcevicardium) perelongatum Johnson, 1905, Proc. Acad. Nat. Sci., 



Phila., p. 15. 



Cardium (Lcevicardium) burlingtonense Johnson, 1905, Ibidem, p. 15. 

 Cardium (Lcevicardium) spillmani Johnson, 1905, Ibidem, p. 15. 

 Cardium spillmani Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, 



p. 583, pi. Ixiv, figs. 9-11. 



Description. " Oblong or profoundly elevated, inequilateral, pro- 

 foundly ventricose ; umbo and summit elevated ; beaks nearly contiguous ; 

 surface with distant irregular grooves on the anterior side, and three to 

 five radiating slightly impressed furrows on the umbonal slope." Conrad. 

 1858. 



Type Locality. Owl Creek, Tippah County, Mississippi. 



" The dimensions of a nearly perfect internal cast are : Height 87 mm., 

 width 55 mm., thickness 60 mm. Shell more or less narrowly subovate in 

 lateral view, and cordate in end view. Hinge line rather short, arched, 

 extending further downward in front than behind ; anterior margin con- 

 vex, the curvature becoming greater below; basal margin regularly 

 rounded; posterior margin longer and straighter than the anterior, usu- 

 ally slightly convex, sometimes straight or slightly sinuate in the casts a 

 little above the middle. Beaks situated back of the middle of the hinge 

 line, strongly elevated above it in the casts, pointed, incurved, and dis- 

 tinctly curved forward. Umbones prominent, the most prominent portion 

 of the shell being in an oblique line from the beaks to the postero-basal 

 margin, this umbonal prominence being not at all angular. The posterior 

 slope much more abrupt than the anterior, its surface conspicuously 



