62 Bulletin 4 176 



The species for which the varietal name, mediavia, is proposed 

 are more oval in outline than the typical form, the rugae are less 

 distinctly defined and are no more abrupt below than above; they 

 have a tendency to disappear on the anterior and posterior parts 

 of the shell. Yet the shape of the young shell and its markings 

 as determined by the umbones of the adults in hand, and the 

 fact that smithvillensis has the capability of extreme variation in 

 one and the same horizon, have weighed strongly in causing this 

 form to be regarded as but a variety of that species rather than 

 as distinct and new. 



Localities. — Alabama: Naheola Landing, Tombigbee river; 

 Matthews' I^anding, Alabama river. 



Type of the variety . — Lea Memorial Collection, Ac. Nat. Sci., 

 Phila. 



Astarte subpontis n. sp., PI. 5, figs. 5, a, b. 



Specific characterization. — Size and general form as indicated 

 by the figures; extremely gibbous; marked exteriorly by concen- 

 tric striae near the beak, becoming stronger or fold-like near the 

 lower margin; inner margin crenulate; teeth and muscular scars 

 typical of the genus. 



Locality. — GEORGIA: In the whitish limestone at the very top 

 of the Midway horizon as represented on the 

 Chattahoochee river. Common. 



Type. — Paleontological Museum, Cornell Univ. 



Astarte aldrichiana n. sp. , PI. 5, figs. 6, a. 



Specific characterization. — General form and size as indicated 

 by the figures; surface covered by strong, even, concentric lines; 

 hinge of right valve with one strong umbonal tooth, before and 

 behind which are pits for the teeth of the opposite valve; an an- 

 terior groove for a rather long anterior lateral and a posterior 

 ridge answering for a posterior lateral, are present; shell polished 

 within; muscular scars faintly impressed; marginal crenulation 

 coarse. 



This shell has the dentition of A. concentrica of the Miocene of 

 Virginia. Except in size and faintness of muscular impressions 

 this is an ordinary Astarte. 



Locality. — Alabama: Dale's Branch, near Oak Hill, Wilcox Co. 



Type. — Paleontological Museum, Cornell Univ. 



