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1415 



TERTIARY FAUNA OF FLORIDA 



Shell robust, solid, inequilateral, subovate, the beaks low and slightly proso- 

 gyrate, near the anterior fifth of the valve ; lunule narrow, deeply impressed ; 

 sculpture of about fifteen broad, slightly rounded radial ribs separated by 

 channelled interspaces and crossed by rather thick, elevated threads or elongated 

 nodules, imbricated towards the beaks and less prominent near the posterior 

 base ; the interspaces are only concentrically striated ; hinge well developed, 

 the laterals prominent, the inner margins coarsely fluted. Length 40, height 27, 

 diameter 18 mm. 



This recalls C. iioridana Conrad, but is larger, proportionally higher, and 

 with fewer and much broader ribs. 



Cardita ( Carditamera ) Prestoni n. sp. 

 Plate 53, Figure 14. 



Miocene limestone of Preston's Sink, near Waldo, Alachua County, 

 Florida ; L. C. Johnson. 



Shell large, heavy, subovate, with low beaks near the anterior sixth of the 

 valve, with a strong and heavy hinge ; sculpture of about six very broad ribs 

 in the middle of the disk and eight or nine smaller ones distally ; deep muscular 

 impressions; margin very coarsely fluted. Length 60, height 35, diameter 

 about 36 mm. 



This species is only represented by an internal cast in a friable Miocene 

 limestone, but it is so markedly different from any other Tertiary American 

 species that it seemed inadvisable to ignore it. It seems to have been somewhat 

 of the type of C. Vaughani, but much larger, more inflated, and with the ribs 

 on the middle of the disk exceptionally wide. 



Cardita. (Carditamera) floridana Conrad. 



Plate 56, Figure ii. 



Carditamera floridana Conrad, Fos. Medial Tert., p. 12, 1838; Am. Journ. Sci., 2d Ser., 



ii-, P- 393. 1846. 

 Cypricardia nodulosa Mighels, Proc. Bost. Soc. Nat. Hist., i., p. 188, 1844. 

 Cardita gibbosa Reeve, Conch. Icon., i., Mon. Cardita, pi. iv., fig. 21, 1843 ; Krebs, West 



India Marine Shells, p. 123, 1864. 

 Cardita Aoridana Dall, Bull. 37 U. S. Nat. Mus., p. 46, No. 178, 1889. 



Pliocene of the Caloosahatchie beds, Florida ; Pleistocene of North Creek, 

 near Osprej', West Florida ; recent from Cape Canaveral, Florida, to the Keys, 

 the Gulf of Mexico, and south to Yucatan. 



C. laticostata Sowerby, of the Pacific coast, is externally much like this 

 species, but it has no lateral teeth. 



