St. Maurice and CIvAiborne Pelecypoda 



scarcely a mile above, the ' 'sands' ' give waj'- largely to lignitic 

 deposits. However,' the complete differentiation of these two 

 stages has not been satisfactorily carried out in western Texas 

 and in the Carolinas. Nor even in Georgia do we know to a 

 certainty the distribution of each of these stages. Again, there 

 is an advantage, physical at least, in having species of adjacent 

 stages figured together on the same plate. 



References to the literature together with discussions of local 

 and general stratigraphy^ will follow in due season. Extensive 

 S5'nonymies and discussions of provenance and relationship of 

 species are withheld for publication in PALEONTOGRAPHICA 

 AMERICANA. We are interested here solely in illustrating 

 and describing the mid-Eocene molluscan fauna of our southeast- 

 ern coast. Some species run through several Eocene stages and 

 ma}^ have alreadj^ been referred to and figured in previous Bull- 

 etins on the Midway or Sabine stages. The mid- Eocene facies 

 of such species will be herewith figured, but the original de- 

 scription must be found b}' referring to former Bulletins. 



G. D. Harris. 

 Cornell University, 

 Feb. 17, 1919. 



