2o6 Bulletin 31 ao6 



Figure 



PLATE 5 



Page 



Ostrea alabainiensisvax. frionisIia.r., X }( 9 



San Miguel Cr., S. E. corner of Frio Co., Tex,, below De Viller's 

 ranch. Texas State Museum, No. 1710. 



O. alabamiensis Lea X >z ; form csW^di georgiana, Shell Bluff,, Ga., 

 C. U. Mus. No. 34,048. "While young showing characteristics of al- 

 abamiensis with /rionis-lihe plications, and when adult having 

 typical contracta-\\k& umbones ; size of georgiana. Jackson Eocene, 



O. alabamiensis var. X i ; young and thin with traces of plica- 

 tions ; Burleson Shell Bluff of Penrose's report, Brazos River ; one 

 mile below Milam-Burleson Co. line. Texas State Museum, No. 55 



