243 St. Maurice and Claiborne Pelecypoda 243 



PLATE 42 

 rigure Page 



I. Cardium oiiac/iiteuse, n. sp., 80 x 100 mm 132 



Alabama Landing, Ouachita River, La. 



2-3. ]^i'otocardia gantbrina Gabb 133 



Fig. 2, 6 mm., Alum BluflF, Tex. Tex. State Mus. 

 3, 9.5 " var. harrisi f ; Lisbon, Ala. 



4. P. nicolletti Con. Portion of exterior, X 4.3, showing transi- 



tion area from medial to posterior region. The pustules are 

 located medially upon the radii. Jacksonian. 



5. P. diversa Con., X 4.3. A similar area to that described above, 



but vpith more numerous ribs and a sharper transition be- 

 tween posterior and medial areas. Pustules on ribs medially 

 located. Vicksburgian Oligocene. 



6. I\ harrisi Dall, X 4.3, showing transition area as above, and 



pustules located laterally upon the radii. 



7-9. P. salrivaliSy n. sp., St. Maurice, La 134 



Fig. 7, 12 mm. 



8, 8 X 10 mm. 



9. X 4. 



10. Protocardia, sp. From Port Royal, Va., from a mid-Eocene 



horizon ; showing a very different outline from the St. Maur- 

 ice specimens from the Gulf States. 



11, Meiocardia Carolines Harris 135 



About natural size ; Neuse River, N. C. 



