2IO Bulletin 31 aio 



PLATE 9 

 Figure Page 



1-6. Ostrea sellcrformis \ax. /isbonrfisis Harris 12 



About natural size ; showing thick, heavy shell and Avicu- 

 loid form ; Chestnut, La. St. Maurice stage. 



7. O. sti/cp/on/iis var. dtvaHcafa liea 12 



From Newton, Miss. 



/^ H\ O. sellcrformis var. verniilla de Greg 12 



Bienville Parish, La. 



