A FEW MID-UPPER EOCENE FOSSILS FROM THE 

 CAROLINAS AND TEXAS. 



The following specimens from isolated localities" •wftose^eol- 

 ogic horizons are for the most part not very definitely established 

 seem worth} T of description and illustration. 



Specific cliaracterization . — Size and general form as indicated 

 by the figures and explanations ; rather inflated ; substance of 

 the shell rather thin, showing on molds of the interior the posi- 

 tion of the ribbing ; ribs about 28-30 in number, compound, tri- 

 partite, the middle part strongest, highest and most crentilate or 

 spinose ; interspaces from *4 to 1 3 the width of the compound 

 ribs ; ribs about the umbonal region simple, finely crentilate, dis- 

 tinctly so just in front of the lunule which is small, deeply sunken- 



The ornamentation, or ribbing of this form diifers materially 

 from that of any other species of the genus with which we are ac- 

 quainted. In the usual alticostata type of ribbing there is a central 

 keel superimposed upon a broader foundation, giving a terraced 

 structure on each side. Here there are actually three raised, 

 radiating, nodose, strong riblets upon each rib, the center one 

 being somewhat the strongest, however. This reminds one of 

 the exterior markings on some Pectens. \ \\ 



The ribs in Conrad's V. blandingi are of the very carinate 

 ' " ' wilcoxensis" type and not of the trilinear style of our new form. 

 The "side-ribs" in perantjqua , as, figured by Whitfield in Mon. U. 



G. D. HARRIS 



BY 



Venericardia eutawcolens, 



PI. 2. Fi g. 1 , 2 



