470 PROCEEDINGS OF THE ACADEMY OF [1896. 



NEW AND INTERESTING EOCENE MOLLUSCA FROM THE GULF STATES. 



BY GILBERT D. HARRIS. 



The following new or interesting fossils belonging to the Lea 

 Memorial Collection of the Academy of Natural Sciences of Phila- 

 delphia have been put into ray hands for description and illustra- 

 tion by Rev. L. T. Chamberlain, of New York City. The greater 

 part of them were collected by Mr. Q. W. Johnson during the 

 summers of 1894 and 1895. They are not all new species ; but 

 many are in such an excellent state of preservation that it has 

 seemed worth while to have them figured by the skilled pen-artist, 

 Dr. J. C. McConnell, of Washington, B.C. 



JACKSON STAGE. 



Pecten claibornensis Con. PI. XVIII, figs. 1 and 2. 



This species has been frequently referred to, but has not hereto- 

 fore been figured. 



Locality, Jackson, Miss. 



Leda regina-jacksonis n. sp. PI. XVIII, fig. 3. 



This fine species is the Jackson representative of L. opidenta 

 Con. of the Claiborne sand. It differs, however, from that species 



(a) in having finer, rounder and not depressed concentric strise ; 



(b) in having directly below the umbo a peculiar, straight, ventral 

 margin for some distance; (c) in being less nasiite posteriorly, and 

 (d) in having the concentric lines on the post-umbonal slope less 

 strongly marked and less distinctly interrupted and deflected by a 

 radiating depression. 



Locality, Jackson, Miss. 



Meretrix pearlensis n. sp. PI. XVIII, figs. 4 and 5. 



The general characters of the species are shown by the figures. 

 The concentric striation is precisely that of Meretrix perovata var. 

 aldrichi (Bull. Am. Pal., No. 1, p. 48, pi. 1, fig. 1) and the young of 

 these two forms sometimes approach each other closely in outline, 

 yet there is always noticeable in pearlensis a tendency to become 

 elongate, like M. Icevigata of the Paris Basin. 



