243 S''^- Maurice and Claiborne Pelecypoda 243 



PIRATE 42 

 I'igure Page 



I. Cardium ouachiteuse, n. sp., 80 x 100 mm 132 



Alabama Landing, . Ouachita River, L,a. 



2-3. Protocardia gambrina Gabb i33 



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

 3, 9.5 " var. harrisi ? ; 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 with more numerous ribs and a sharper transition be- 

 tween posterior and medial areas. Pustules on ribs medially 

 located. Vicksburgian Oligocene. 



6. /-*. harrisi Dall, X 4.3, showing transition area as above, and 



pustules located laterally upon the radii. 



7-9. P. salrivalis, n. sp., St. Maurice, La I34 



Fig. 7, 12 mm. 



8, 8 X 10 mm. 



9, X 4. 



10. Protocardia, s'p. From Port Royal, Va., from a mid- Eocene 

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

 ice specimens from the Gulf States. 



II. Meiocardia Carolines Harris 135 



About natural size ; Neuse River, N. C. 



