29 St. Mauricp: and Claiborne Pelecypoda 29 



mens ver>' similar apparenth- to these we have referred to hereto- 

 fore as A. sg7(afiiu/nvi. The}' are, however, about 40 per cent 

 larger than the Woods Bluff specimens, are perhaps a little more 

 regularly inflated, and have the interior ribbing extending not so 

 near the lower margin. 



Specimens Jigiired.—'^egreet Bayou, La ; deposited in Pal" 

 eont. Mus., Cornell Univ. 



Lima harrisiana Aldrich, PI. 16. Figs, i, 2. 



L. /larrisiana Aid., Nautilus, vol. 24, 1910, p. 74, pi. 4. figs. 10, 11. 



Aldrich's original description. — vShell oblong, slightly oblique, radi- 

 ally sculptured, covered with close-set lines slightly nodular ; between them 

 in the sunken .spaces are fine dotted lines which die out towards the hinge line 

 and umbo. The ribs are very numerous, near the umbo on one side they ap- 

 pearquite nodulous ; ears very unequal, hinge nearly straight, but somewhat 

 inclined to the central axis. In a young specimen the ribs appear to be nod- 

 ulous and the inner margin denticulated. 



Longest axis 17mm. 



Locality. — Smithville, Texas. 



Remarks: This species seems to be rather close to L. vicksbiirgiaiia 

 Dall, but has many more ribs, over 50 in all. 



We have found one specimen belonging to this genus in the 

 Mid- Eocene of. America and that is the one herewith figured. 

 The A. ozarkana djeseri^oe^^hy us in a former Bulletin from the 

 Sabine stage belongs to quite a different type of Lii)ia. 



Type. — Aldrich collection. 



Horizon. — St. Maurice Eocene. 



Specime7is figtircd. — Deposited at Cornell. 



Localities.— '$irm'(\\.v\\\e, Tex. ; Atlanta road six miles W. o^ 

 Winnfield, La., S. E. of the so-called Marble Quarry. 



Spondylus sp. 



Accompanying the Winnfield specimen of Z. harrisiana \s a 



fragment of Spondylus of diiviosian type but too imperfect for 



further characterization. 



Pteria limula Conrad, PI. 16. Figs. 3-7. 



.-Ivicula limula Con., Foss. Sh. Tert. P'orm., Oct. 1833, p. 39. 

 A. claibornensis h&A, Cont. to Geol. Dec. 1833, p. 86, pi 3, fig. 65. 

 A. claibornensis de Greg., Mon. Faun. Eoc 1890, p. 183, pi. 22, fig. 4. 

 A. cardincrassa de Greg., Mon. Faun. Eoc, 1890, p. 184, pi. 22, 



