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TERTIARY FAUNA OF FLORIDA 



Miocene of the James River, near Smith field, Virginia, and of Maryland, 

 near Skipton ; Conrad and Harris. 



Shell with four large and two smaller lateral simple ribs, internally lirate; 

 submargins narrow, minutely scabrous, not radiated ; the rest of the disk 

 entirely covered with fine, squared, elevated, minutely scaly radial threads ; 

 ears subequal, finely radiated; sinus well-marked; ctenolium and cardinal 

 crura developed. Alt. of type 20, lat. 19 mm. 



This is not the Pecten (Pseudamusium f) Rogersi Clark, Bull. U. S. Geol. 

 Surv., No. 141, p. 85, pi. 34, figs, la-b, 1896, from the Eocene of Potomac 

 Creek, Front Royal, Virginia. For the latter the specific name oS. frontalis is 

 suggested, since there is already a species named for Professor Clark. 



Pecten (Nodipecten) caloosaensis n. s. 

 Plate 29, Figure 12. 



Caloosahatchie Pliocene marl of the Caloosahatchie River and Shell 

 Creek; Willcox and Dall. 



Shell moderately large, with four principal ribs and sometimes a sub- 

 sidiary, much smaller, rib at the inner edge of the submargins ; backs of the 

 ribs strongly radially striated or even threaded, the interspaces smooth or with 

 only obsolete traces of striation, equal to or wider than the ribs; concentric 

 sculpture usually weak, of close-set concentric elevated or incremental lines ; 

 submargins wide, the outer margins smooth, the inner threaded like the backs 

 of the ribs ; ears large, triangular, widest at the cardinal margin and pointed at 

 the distal cardinal angle, their sculpture radial, not crowded ; feeble, except 

 upon the byssal ear, where the threads are strong and concentrically scabrous ; 

 byssal notch wide, shallow, the fasciole conspicuous ; ctenolium distinct ; in- 

 terior reflecting the external ribs ; hinge with the crura present but feeble in 

 the young ; the old specimens have them obsolete, but on the cardinal margin 

 a relatively broad ligamentary area is formed. Alt. 83, lat. 80, diam. 30 mm. 



This is one of the finest and most characteristic species of the Pliocene, 

 remarkable for its wide, acute ears, and for having the interspaces of the ribs 

 nearly smooth, although the ribs are striated. 



Pecten (Nodipecten) antillarum Recluz. 

 Pecten aiitillariim Recluz, Journ. de Conchyl., iv., p. 153, pi. 5, %. i, 1853 (May) ; Beau, 



Cat. Coq. Guadalupe, p. 21 ; Arango, Fauna Mai. Cubana, ii., p. 209, 1878. 

 Pecten fucaius Reeve, Conch. Icon., Pecten, pi. xxxi., fig. 139^-15, 1853 (June); Krebs, 



W. I. Mar. Shells, p. 134, 1864. 



