i85 Midway Stage 7^ 



MARTESIA. 



Martesia dalliana n. sp., PI. 6, fig. 15. 



Specific characterization.— Oen&rsl form as indicated by the 

 figure which is i^ natural size; subcylindrical in cro^s-section ; 

 strongly characterized by the faintness or practical absence of 

 the groove that generally in this genus extends from the umbo 

 obliquely backwards to the basal margin; anterior end narrow, 

 covered with concentric, rather strong striae, which as they pass 

 around an anterior umbonal carina are bent downwards nearly 

 at right angles, and again some distance below are deflected 

 backwards; at the point of backward deflection there is a very 

 faint trace of the groove mentioned above. 



Locality.— O^o^Qik: Near the base of the Midway stage on 

 the Chattahoochee river not far above the mouth 

 of Sandy creek. 

 Type. — Paleontological Museum, Cornell Univ. 



VERTICORDIA. 

 Verticordia sp., P^- 6, %• ^6. 



The specimen figured being the only one obtained from the 

 Midway it seemed best to defer its specific characterization until 

 its relations with V. eocense Langdon, can be determined. It is 

 very much smaller than Langdon's species and from the figure 

 of it by Aldrich (Bull. Geol. Surv. Ala., No. i, 18S6, pi. 6, fig. 

 13), it is considerably different in form. How much of this 

 difference may be due to age connot at present be determined. 



Locality.— khh.-QKWK: i mi. W. of Oak Hill P. O., Wilcox Co. 



Specimen figttred.—Y2}iQ.on\.o\o<g\c2X Museum, Cornell Univ. 



PHOLADOMYA. 



Pholadomya mauryi n. sp., PI- 6, figs. 17, a. 



Specific characterization.— Qx^n^X2\ form as indicated by the 

 figures; surface nearly smooth posteriorly, but marked on the 

 anterior slope by several light costse increasing in strength from 

 those nearest the superio-anterior margin to those extending 

 from beak to anterior margin on the right valve, inclined to 

 alternate in size; posteriorly from the seventh or eighth of these 

 strong ribs there are as many more faint ones on the medio- ante- 

 rior portion of the shell; concentric undulations not strongly 



