6 BrLLETix 33 6 



REMARKS ON VIRGINIA EOCENE FOSSILS 

 By Kathkrine Van Winkle 



The following notes and descriptions are based on material 

 collected by members of the first cruise of the Ianthina in Vir- 

 ginian waters in 1897. Most material, then new, has been sub- 

 sequently described by members of the Maryland Geological Sur- 

 vey ; and interesting geographic data on the Virginian beds have 

 been published by members of the Survey of that State. How- 

 ever, these few additional notes seem worthy of publication. 



Genus LEDA Schumacher 



Leda coelatella, n. sp. PI. i Figs. 4, 5 



Specific characterization . — Size and general form as indicated 

 by the figures and explanations ; rather thick ; of the ccelata 

 stock, but differing from the Claiborne form by its smaller size, 

 less inflation medially, less relative contraction posteriorly and 

 especially by its more primitive surface marking — great diagonal 

 rugae of nearl}' equal strength across the whole valve with only 

 a down-dipping in the young stage as they approach the umbonal 

 ridge, whereas in coelata these rugae are strong only on the sector 

 just posterior to the middle; in advance of the same such mark- 

 ings become fainter, swing upward across the channel from beak 

 to anterio-basal margin and finall^^ resume their former direction 

 till they reach the margin of the shell ; lunule, escutcheon aiTd 

 post-umbonal markings v^xy similar to those of ccBlata, though 

 the radial ribs are more generall}- and coarsely granulate, thus 

 recalling C(jclatoides. 



Types and specimens figured.- — Paleontological Museum, Cor- 

 nell Univ. 



Horizon. — Probably lower St. Maurice Eocene. 



Locality. — New Castle, Va. Collected by ist Ianthina Ex- 

 pedition, '97. 



