29 St. Maurice and Claiborne Pelecypoda 29 



mens very similar apparently to these we have referred to hereto-' 

 ior&-A.s A. i>quaimduin. Thej^ 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 figured. — Negreet Bayou, La ; deposited in Pal" 

 eont. Mus., Cornell Univ. 



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



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



Aldrich's original description. — Shell 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 the}- 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. 



IvOngest axis 17 mm. 



Locality. — Smithville, Texas. 



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

 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 Z. <?2'ar/^a;zfl described by us in a former Bulletin from the 

 Sabine stage belongs to quite a different type of Lima. 



Type. — Aldrich collection. 



Horizon. — St. Maurice Eocene. 



Specimens figured. — Deposited at Cornell. 



Localities. — Smithville, Tex. ; Atlanta road six miles W. o^ 

 Winnfield, I^a., S. E. of the so-called Marble Quarry. 



Spondylus sp. 



Accompanying the Winnfield specimen of L. harrisiana is a 



fragment of Spondyhis of dtimosum type but too imperfect for 



further characterization. 



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



Avicula limiila Con., Foss. Sh. Tert. Form., Oct. 1833, p. 39. 

 A. claibornensisl-i&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, 



