lo Bulletin 31 10 



pata Co. line, 5, and 13 mis below Laredo ; Cedar Creek and Dunn 

 ranch, Robertson Co. ; 5 mlsW. of Crockett, W. of Caney Rayou, 

 San Antonio road, Houston Co. ; 4 mis N. E. Alto, Cherokee ; 

 S. E. Corner of Frio Co. 



Large 'specimens described bj' Conrad as O. contrada were 

 from "03'ster Point, near Mier, Tex." Other localities for the 

 .same are: Rio Grande at Carrizo, above Roma, 15 mis below 

 Carrizo and at Campbellton, Atascosa Co. ; Oy.ster Bluff, 

 Brazos River, Milam Co., 2 mis above the mouth of Pond Cr. 

 South Fork of Hurricane Cr. 



Louisiana : vSabine River, near Columbus as in nearby E. 

 Tex. ; 3 mis S. E. of Negreet ; in form of cast 2 mis N. of 

 Plaindealing. 



Alabama : Claiborne, Go.sport, Lisbon, Hamilton Bluff. 



Georgia : Grovetown, Shell Bluff. 



South Carolina : Rocky Swamp, Orangeburg Dist. 



A^orth Carolina : very abundant on the Neuse and Trent 

 Rivers. See especially exposure near R. R. bridge at Pollocks- 

 ville. 



The localities mentioned above are those from which we 

 have personall}' identified this form. Various authors, especial - 

 1)^ Dall, have mentioned this species (under the name of 

 georgiana') as having a wide Oligocene distribution in Florida, as 

 the 'Helt fosdV of the Grand Gulf (See Trans. Wag. Free In.st. 

 Sci., vol. 3, p. 685, &c). We cannot speak with authority on 

 the wide geologic range here suggested. 



Ostrea sellseformis, Plates 6-8. 



O. sellt^fonnis Con. Foss. Sh. Tert. Form., p. 27, pi. 13, fig. 2, 1852. 

 O. radians Con. ibid, fig. i. 



O. divaricata Lea, Con. to Geol., 1833, p. 91, pi. 3, fig. 70, 1833. 

 O. sellcsformis Con., Proc. Nat. Inst., 1842, p. 192, pi. i, fig. i. 

 O. sellcsforrnisYL^A^., Ann. Rept. (IV), U. vS. Geol. Surv., 1883, p. 



311, pi. 62, figs. I, 2 ; pi. 63, fig. I. 

 (9. 5^//<«yc>r;;/75 de Greg. , Mon. Faun. Eoc, p. 175, pi. 19, figs 1-12, 



1890. 

 O. sellcefonnis Dall (in part), Tr. Wag, III, p. 677, 1898. 

 O. sellcsformis Clark and Martin, Geol. Surv. Md. ; Eocene, p. 192, pis. 



48, 49, 1901. 



