NO. 6 OYSTERS OF THE LOPHA LUGUBRIS GROUP KAUFFMAN 8l 



1884. A review of the fossil Ostreidae of North America, and a comparison 

 of the fossil with the living forms. 4th Ann. Rep. U. S. Geol. Surv., 

 pp. 272-430, pi. 41, fig. 3 ; pi. 45, fig. 1 ; pi. 46, fig. 2 ; pi. 48, figs. 1-3. 



WiNTON, W. M. 



1925. The geology of Denton County. Univ. Texas Bull. 2544, p. 62, pi. 8, 

 fig. 5. 



