. Bulletins of American paleontology. Paleontology. 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 an
. Bulletins of American paleontology. Paleontology. 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 13 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cornell University; Paleontological Research Institution (Ithaca, N. Y. ). Ithaca, N. Y. : Paleontological Research Institution [etc. ]
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