( 69 ) TERTlAliY MOLLITSCA OF AlA. AND TeX. T^ 



coming nearly obsolete on the beaks; a fetv lines of growth cross- 

 ing the stria; beak small, hinge margin slightly curved, ascend- 

 ing; very small fissure on basal margin. 



Locality. — Choctaw Comer, Ala, 



Gealogical horizon. — ^Wood's Bluff section, 



LITHODOMUS. 



Litlwdomiis daibornenm Con. _ ^J- 5> ^o- H- 



Lomlity. — Claiborne, Ala. 



LED A. 



Lcda wbmt<}, nov. sp. ^^- 5- %• i. ^^' 



Shell robust, inequilateral; surface covered with rather coarse 

 folds most prominent on the umbo ; anterior elliptically rounded 

 with an obtuse carmation ; posterior pointed, abruptly narrowmg; 

 upper posterior margin strongly carinated with a deep furrow 

 running from beak to margin ; the folds continue across both 

 furrow and escutcheon; teeth arched, most prominent on pos- 

 terior; cavitv of the shell deep ; interior polished; fosset set well 

 under the beaks which incline towards the posterior. 

 Zt7m///)'.— Lower bed, Wood's Bluff, Ala. 



Distinguished from all others by its rotund shape, giving it 

 almost the appearance of a Corbiila ; rather common. 



Leda don^atoidea , nov, sp. -P^- 5- ^%- 2- 



Shell inequilateral; flattened; surface with fine concentric folds, 

 rugose on the upper posterior margin, which is bordered by two 

 carinated lines; anterior elliptically rounded, folds more distmct 

 at the margin near the beaks; teeth inequilateral, closely set, 

 numerous, their apices pointing towards teak; posterior carmation 

 .showing through the shell; fo.sset deep; margin entire. 



/.^m///j'.— Butler, Ala. 



Gcolooical //c7/7>^;/.— Wood's Bluff section. 



Approaches closelv to L. prof ex fa Con., but it is much more in- 

 equilateral. Larger specimens are grooved on the posterior mar- 

 gin and have the a.spect of a Yoldia. The drawing is made from 

 a half grown specimen, and is not very charai:teristic. 



Leda lisbo?ieiisis, nov. sp. ^^- 5- g- 4 



Shell oblong, lanceolate; very inequilateral, the posterior part 

 , being nearly twice as long as the anterior ; compressed ; beak 

 verv small smooth ; escutcheon striated, depressed, bordered out- 

 wardly by a serrated rib ; posterior .slope with two ribs, forming 



