FREE INSTITUTE OF SCIENCE 



■ 745 



TERTIARY FAUNA OF FLORIDA ' ^"^ 



over the line, and separated from the present species more by its outline than 

 by any other important character, is the shell I have called Aimisiiun ocalannvi, 

 all of which, with the aid of A. Lyoni Gabb, form a complete connecting series 

 between the most typical Amusiiim and undoubted Cldainys. 



Pecten (Plagioctenium) gibbus Linne. 

 Osirca gibba L., Syst. Nat., Ed. x., No. 172, p. 698, 175S; Ed. xii., No. 203, p. 1147, 



1767. Jamaica. 

 Not Ostrca gibba Born, Test. Vindo., p. 107, 1780; nor 

 Pecteii rubicundiis gibbostts Ch., Conch. Cab., vii., p. 321, pi. 65, figs. 619-20, 1784; 



nor of Dilhvyn, Cat. Rec. Sh., i., p. 267, 1S17 (in part). 

 Ostrca lufea Gmelin, Syst. Nat., vi., p. 3320 ; -|~ O plana Gmelin, /. c. ; -f- O. flabeUiim 



Gmel., op. cit., p. 3321. 

 Pecten gibbits Sowerhy, Thes. Conch., i., fig. 17 (only), 1843. 

 Pecten gibbtis Reeve, Conch. Icon., pi. 9, figs, yj b, yj c, not fig. 3717, 1852. 

 Pecteii Soverbii Q,m\.^\Xi%, 1826, not of Reeve, 1852. 

 Pecten dislocattis Say, Journ. Acad. Nat. Sci. Phila., ii., p. 260, 1822 ; Am. Conch., Ivi., 



fig. 2, ia, 1834. 

 Pecten. pitrpuratus Conrad, Am. Mar. Conch., p. 10, pl.ii., fig. i, 1831 ; DeKay, Zool. 



N. Y., v., p. 174, 1843 ; not of Lamarck. 

 Pecten dislocattis Hohnes, Post-PL Fos. S. Car., p. 13, pL ii., fig. 13, 1858. 

 Pecten circularis Guppy, Paria Fauna, p. 155, 1877 ; not of Sowerby. 

 Pecten gibbns Orb., Moll. Cuba, ii., p. 352, 1845 ; Krebs, W. I. Mar. Sh., p. 134, 1864; 



Arango, Fauna Mai. Cubana, ii., p. 270, 1878. 

 Pecten irradiatis var. dislocattis Dall, Bull. U. S. Nat. Mus., No. 37, p. 34, No. 24, 1889. 

 Pecten niicletts Heilprin, Trans. Wagner Inst., L, p. 102, 1886. 



Fossil in the later Miocene of the Nansemond River, Suffolk, Virginia, 

 Burns ; in the Pliocene of Florida, in the Caloosahatchie marls on the Caloosa- 

 hatchie, Shell Creek, Myakka River, and Alligator Creek, Willcox and Dall ; 

 in the Pleistocene of North Creek, Osprey, Florida, Dall, and of the Caro- 

 linas ; also in the raised coral reefs of the Antilles. The Miocene specimens 

 are of the typical variety gihhus ; the Caloosahatchie marls contain var. gibbns 

 and var. ainplicostatiis in about equal numbers ; the Pleistocene of North 

 Creek has var. gibbns and var. borcalis, an indication of the more southerly 

 extension of the latter during the low temperatures of that epoch. 



This species is at present widely distributed, and is found living from 

 Cape Hatteras south to the Greater Antilles and Brazil, and on the continental 

 shore to Vera Cruz and the Bay of Campeachy ; also on the northwest coast 

 of Africa, according to various authors. 



