169 Midway Stage 55 



striate, but in the state of casts, the only markings generally 

 observable are the concentric lines on the flattened posterior. 



The new localities we have recorded are: Hannah's, bed /, i^ 

 miles N. of Crainesville, Hardeman Co., Tenn., and Huddle- 

 ston's, about the same distance W. of Crainesville. 



Leda saffordana n. sp., PI. 4, fig. 9- 



Syn. L. protexta Gabb, Jr. Ac. Nat. Sci. Phila., vol. iv, p. 

 397, pi. 68, fig. 36, (non L. protexta Gabb, ibid., p. 

 303, pi. 48, fig. 23. ? Leda bella Con., ibid., p. 295). 



Specific characterizatio7i. — Size and general form as indicated 

 by the figure (some specimens somewhat more elongate); concen- 

 tric lines rather prominent centrally but becoming obsolete ante- 

 riorly and posteriorly; a slight depression passing from umbo to 

 post basal margin; escutcheon bordered by a well defined ridge 

 and traversed medially by a fainter secondary ridge. 



Localities. — TENNESSEE: Near the old stage road, about two 

 miles S. of Middleton, Hardeman Co. 



Alabama: % mi. N. of Snow Hill. 



Georgia: Near base of Eocene on Chattahoochee 

 river. 



The specimens described by Gabb were kindly lent the writer 

 by Dr. Safford. They certainly are not the L. protexta Gabb, p. 

 303, as referred to above; hence the need of a new name and L. 

 saffordana has accordingly been proposed. The large, imperfect 

 specimen Gabb refers to, p. 397, is quite probably a different 

 species from the smaller forms. 



Type. — Collection of Jas. M. Safford, Nashville, Tenn. 

 Leda elongatoidea var.?, PI. 4, fig. 10. 



A single valve of a marked variety of a species quite common 

 at Wood's Bluff, Ala., was found at Matthews' Landing. Both 

 this and the Wood's Bluff specimens do not agree entirely with 

 Aldrich's description and figure of L. elongatoidea (Bull. Am. 

 Pal. No. 2, p. 17), hence we postpone further discussion until we 

 have ampler material and know to a certainty to what species the 

 name elongatoidea has been given. 



Leda quercollis n. sp., PI. 4, fig. n. 



Specific characterization. — Size and general form as indicated 

 in the figure; thick; surface covered throughout with rather 

 strong concentric lines; a faint sinus extending from beak to pos- 



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