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659 

 TERTIARY FAUNA OF FLORIDA 



Ai'ca liinatida ILmmons, 1858, Geol. N. Car., is a typographical error for 

 A. limula Conrad. A. lintca Conrad (in App. Kerr's Geol. N. Car., 1875) is 

 not A. lintca Conrad, 1852 (Rep. Dead Sea Expedition under Lieut. Lynch). 



Pliocene and later. A. DesJiaycsii Hanley is reported by Gabb from the 

 Pliocene of Costa Rica. Nelson has described and figured an A. Larkini from 

 the Pliocene (?) of Peru. Gabb describes and figures A, sidcicosta from the 

 Pliocene of California (1866), but the name had previously been used by Nyst 

 in 1836 for a Belgian fossil, and Gabb's species may take the specific name of 

 schi^otonia. Area velata Sowerby (Indopacific) is reported by Gabb from the 

 Pleistocene of St. Domingo, but his shell is probably a distorted specimen of 

 Area Candida or Helblingi. 



The following is a list of the recent species of Area belonging to the 

 southern coast of the United States, and any of which might be expected to 

 occur in our later Tertiary or Pleistocene beds : 



Area occidentalis Phil., A. nvibonata Lam. ; Barbatia barbata Linne, B. 

 [Calloarca^ Candida Gmel., B. (C) nodulosa Miill., B. (Acar) retietdata Gmel., 

 Barbatia {Fossiilareci) Adanisi (Shuttlew.) Smith; B. i^Cnc^dlarid) aspcrida 

 Dall, B. [Qicidlarid) sagrinata Dall, B. [Qicullana) profundicola Verrill ; No'etia 

 ponderosa Say, No'etia bisidcata Lam. ; Scapharca secticostata Rve., 5. trans- 

 versa Say, S. Deshayesii Hanley, 5". aiiricidata Lam., 6". (Cnneared) ineongrna 

 Say, 5. [Cunearca) Chemnitzii Phil., 5. (Argina) cavipecliensis Dillwyn with 

 varieties pexata Say and americana Gray, S. {Bathyarca) peciiincidoides 

 Scacchi, S. [Bathyarca) polycynia Dall, 5. (Bathyarca) gloinernla Dall. 



Superfamily PTERIACEA. 



Family PINNID^. 



The ancient genus Pinna of Linnaeus, as represented in our Tertiaries, is 

 divided into two genera : 



1. Pinna proper; with the fibrous layer of the valves mesially sulcate longi- 



tudinally while the inner nacreous layer is bilobed deeply by the same 

 (closed) sulci. The type of the genus is P. rudis L., the red Pinna of 

 the West Indies. P. fiabcllnm Lam. and P. carnea Gmelin belong to it. 



2. Atrina Gray ; has the valves unsulcate or without the median carina, and 



the internal nacreous layer is entire. The type is P. nigra Ch., and it is 

 represented in our recent fauna by P. rigida Dillwyn {P. uniricata auct.) 

 and P. serrata Sby. 



