235 LiGNiTic Stage 43 



Lima ozarkana, n. sp. PI. 6. fig. 12. 



Specific charanerization. — General form and size as indicated 

 by the figure ; ventricose; ligamental pit very broad, occupying a 

 greater part of the hinge plateau ; surface marked by 25 or 30 

 sharply defined radiating raised lines, between which are second- 

 ary and sometimes tertiary systems of lines. 



Locality. — Alabama : Ozark, R. R. cut, just beneath the Buhr- 



stone. 

 Type figured. — From Ozark, Ala.; Collection of Paleont. Mus. 

 Cornell University. 



Pseudamussium claibornense, PI. 7, fig. i. 



Syn. P. claiboniensis Con., label, Phila. Acad. Museum. 



Camptonectes claibornensis Con., Smithsonian Check Ivist. 



Pecten claibornensis Heilprin, Proc. Acad. Nat. Sci. Phila., i8Si, 



p. 416. 

 Pecten claibornensis Har., Geol. Surv. Ark., Rep't 1892, vol. ii, p. 



145- 

 Pecten claibornetisis Har. Proc. Acad. Nat. Sci. Phila., 1896, p. 470, 

 pi. 18 fig's I and 2. 



It is quite possible that the little P. sciyitillatus figured and des- 

 cribed by Conrad ( Amer. Jour. Conch., 1865, p. 140, pi. 10, fig. 

 4. ) is but a young or dwarfed specimen of this species. P. clai- 

 bornensis has never been fully characfterized, but was referred to 

 by the writer in his Arkansas Report as follows : ' ' This rather 

 small, thin Pecten appearing smooth to the naked eye, when ex- 

 amined under a microscope is found to contain minute ex-curving 

 radiate lines, especially near the anterior and posterior margins. 

 It is fairl}^ abundant at Moody's branch, near Jackson, Missis- 

 sippi." 



The specimens now under consideration are .somewhat larger 

 than those from Moody's branch, but there seems to be no valid 

 reason for regarding the two forms as specifically distindl. 



The resemblance of this species to P. calvatus Mort. is of course 

 noticeable as Heilprin and others have observed, but if we mis- 

 take not, that species does show freqently well defined costse, 

 this is always smooth both within and without. 



European representative. — P. cornejis Sby.,Min. Conch., pi. 204. 

 Locality ( Lignitic ) . — Alabama : Hatchetigbee Bluff. 

 Speciviens figured. — Hatchetigbee Bluff, Paleont. Museum of 

 Cornell University. 



