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583 



TERTIARY FAUNA OF FLORIDA 



In his interesting review of the genera of Lcdidte and Xitcnlidic of the 

 Atlantic coast of the United States (Am. Journ. Sci., Jan., 1897, pp. 51-63) 

 Professor Vcrrill, in his remarks on his subfamily Tindariince (page 58), ob- 

 serves that the writer has proposed the family Ctcnodontidce to include the ex- 

 tinct genera Paleoncilo, Nitcnlites, and others, but that it is doubtful " whether 

 Ctcnodonta itself belongs here." He also cites " Ctcnodontidcc Dall, pars" as 

 synonymous with his subfamily Tindaniiuc. All this expresses a complete 

 misconception of the arrangement made by me (pp. 515-516). None of the 

 members of Tindariiiuc, Vcrrill, are comprised in the group suggested doubt- 

 fully by me as " ? Family Ctenodontidic" and I did not mention Palconeilo, but 

 expressly stated that " many forms" " described under the name of Ctenodonta" 

 " belong in the Nnculidtf or Lcdidtc," and placed all the members of Pro- 

 fessor Verrill's Tindariina:, as he does, under the Ledidte. I had not the 

 slightest intention of combining Tindaria and its allies with Ctenodonta, but 

 indicated their separation as complete. Ctenodonta has been referred to 

 Arcidce by Zittel and several of the older authors, but the indications all 

 point to the derivation of the very modern group of Arcidce through the Pec- 

 tunculoid Taxodonts at a much later period than the appearance of Ctenodonta. 

 Not having a proper series of specimens of the older forms, I have preferred 

 to avoid attempting a revision of the Paleozoic genera, which comprise the 

 beginnings of so many different groups, and require for adequate comprehen- 

 sion a truly monographic treatment. 



Subfamily SAREPTIN^E A. Adams. 



Nuculacea with a more or less developed external ligament in addition 

 to a sunken or internal resilium, a short hinge-plate, a simple pallial line, and 

 a porcellanous shell. The species are usually small and rounded, smooth or 

 concentrically striated externally, not rostrate, and without crenulations on 

 the margins of the valves. 



Genus SAREPTA A. Adams, 1860. 



Shell rounded-ovate, with a feeble remnant of an external ligament 

 above and at the end of the elongated narrow oblique resilium, which latter 

 is seated on a wider triangular area of hinge-plate interrupting the short 

 series of oblique attenuated teeth ; valves closing completely. Type S. spc- 

 ciosa A. Adams, Japan. 



While the resilium is still within the area usually occupied by a chon- 



