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TERTIARY FAUNA OF FLORIDA 



Pecten (Amusium) papyraceus Gabb. 



This species, described from the Tertiary of St. Domingo, appears to 

 be identical with the recent species of the Gulf of Mexico and the Antilles. 

 I formerly referred it to P. Mortoni, to which it is closely related, but it is 

 generally less orbicular and smaller than the typical P. Mortoni, and in default 

 of a full and completely intergrading series it is probably better to retain 

 Gabb's name. 



Pecten (Amusium) Mortoni Ravenel. 



Pecten J/rvWv// Rav., Proc. Acad. Nat. Sci. Phila., ii., p. 96, 1844 ; Tuomey and Holmes, 

 I'leioc. Fos. S. Car., p. 27, pi. 10, figs. 1,2, 1855 ; Emmons, Geol. N. Car., p. 281, 

 1858. 



Miocene of Fairhaven and Drum Point, Maryland; Duplin County, North 

 Carolina ; Cooper River and Goose Creek, South Carolina, and in the upper 

 bed at Alum Bluff, Chattahoochee River, Florida ; Pliocene of the Caloosa- 

 hatchie marls on the Caloosahatchie and Shell Creek, Florida ; Burns, Willcox, 



and Ball. 



Pecten (Propeamusium) alabamensis Aldrich. 



J't'i/i-it (I'/cunnicc/iii) iiliibanicnsis Aldr., Bull. Geol. Surv. Ala., p. 40, pi. 4, fig. 8, 1886 ; 



Harris, Bull. Pal., iv., p. 162, pi. 2, fig. 3, 1896. 



/'irfi-n u/dfiiMii-nsis Harris, Geol. Surv. Ark., Rep. for 1892, ii., p. 41. 

 /<</(// (.liiiHs.'iiitiii) iita/>iiiiii-iisis de Gregorio, Mon. Claib. Fauna, p. 183, pi. 21, fig. 26, 



1890. 



Basal or Midwayan Eocene of Dale's Branch, Matthews Landing, and 

 Nahcola, Alabama, and of Marshall's Well, Little Rock, Arkansas. 



This interesting little species reaches less than five millimetres in extreme 

 height, has the right valve concentrically striated or nearly smooth, the left 

 with sparse, partly obsolete radial threads crossed by elevated, concentric, 

 distant lines, with a tendency to nodulation at the intersections. Internally 

 there are about eight or ten well-developed lira; and the auricular crura. The 

 byssal ear has sparse radii and a distinct byssal notch. 



Pecten (Propeamusium) squamula Lamarck ? 

 .'/',;/<7i ii/iiiuinila Lam., Ann. du Mus., viii., p. 354, No. 3, 1806; Hist. An. s. Vert., 



vi., p. 183, 1819; Desh., Descr. Coq. Fos. Km. Paris, i., p. 304, pi. xlv., figs. 



16-18, 1824.. 



.'. \mitssiinn at/iiainu/a Cossm., Ann. SIM . Roy. Mai. <le P.Hi;., \xii., |>. 188, 1887. 

 .liiiiissiiiin si/iiiiiiiH/inii Harris, Bull. Pal., ix., p. 44, pi. 7, figs. 2, 3, 1897. 



Chickasawan (or Lignitic) Eocene of Wood's Bluff, Alabama ; Harris. 



