FREE INSTITUTE OF SCIENCE 



635 



TERTIARY FAUNA OF FLORIDA 



Pliocene marls of the Caloosahatchie, Florida ; Heilprin, Willcox, and 

 Ball. 



This magnificent species is the largest and most distinct of the entire 

 group, and so far has been obtained only on the Caloosahatchie River. The 

 S. iiicottgnia has not yet been found in these marls. 



Scapharca (Cunearca) incongrua Say. 



Area hiion^rua Say, Journ. Acad. Nat. Sci. 1'hila., ii., p. 268, 1822 ; Reeve, Conch. 



Icon., Area, pi. viii., fig. 50, 1844. 



Not Ana braziliana Reeve, Conch. Icon., Area, pi. iii., fig. 17, 1844, =A. nodosa Wood. 

 ? Area braziliana Lam., An. s. Vert., vi., p. 44, 1819; Phtlippi, Abbild. u. Beschr., i., 



Area, p. 2, pi. i, fig. 3, 1843. 



Upper Miocene of the Galveston artesian well (?), Singley ; Pliocene of 

 Port Union, Costa Rica, Gabb; typical specimens from Pleistocene of Wailes 

 Bluff, Maryland, Simmons Bluff, South Carolina, Burns, and Brunswick, 

 Georgia, Couper; recent from North Carolina south to Texas, and (var. ? 

 brarjliana) from Texas south and east to Cape Roque and south to Rio, Rio 

 Grande do Sul, San Paulo, and Santa Caterina, Brazil (Ihering). 



This species is a very puzzling one, and a large geographical series is 

 required to determine its exact limits. The figure given by Reeve is poor, 

 and has probably helped to continue the confusion. 



The typical //. incongrua is quite variable in form, and I have not seen 

 specimens which could be unhesitatingly referred to it from older beds than 

 the Pleistocene, or more southern localities, living, than the coast of Texas. 

 Here it is mixed with specimens of the braziliana type, towards which the 

 incongrua tends to vary. The Costa Rica Pliocene fossils are exactly like 

 braziliana ; the Antillean shells also, while varying a good deal, retain the 

 dimensions of braziliana and more or less of its other characters. It is 

 probable that the two forms would better be kept apart, at least until more is 

 known. 



Scapharca (Cunearca) alcima Dall n. s. 

 PLATE 31, FIGURKS 5, 7. 



Pliocene marls of the Caloosahatchie at Alligator Creek, Florida; Dall. 



Shell of moderate size, short, high, inflated, with elevated prosogyrate 

 beaks ; left valve with thirty strong, squarely nodulous, radial ribs somewhat 

 narrower than the interspaces, without obvious concentric sculpture, front 

 edge rounded, posterior less rounded and longer, meeting the base at a rather 



