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621 



TERTIARY FAUNA OF FLORIDA 



.-hnr imbncata (Brug.) Dall, Hull. U. S. Nat. Mus., No. 37, p. 40, 1889; Heilprin, Trans. 



Wagner Inst., i., p. 118, 1887. 



Area Listeri (Tryon) Heilprin, Trans. Wagner Inst., i., p. 118, 1887. 

 Barbatia Ilonat -jyi Gabb, Geol. San Domingo, p. 254, 1873. 



Oligocene of the Chipola beds, Calhoun County, Florida ; of the Ballast 

 Point silex beds, Tampa Bay, Florida ; of the Alum Bluff sands at Oak Grove, 

 Santa Rosa County, Florida. Also in the Pleistocene of the Florida Keys 

 and the Antilles, and living from Cape Hatteras, North Carolina, south to 

 Santa Caterina, Brazil, and throughout the Antilles. 



Like all the group, this nestling species is variable in form according to 

 its station, but I have been unable to find any characters to separate the fossil 

 and recent shells when allowance is made for the deformations alluded to. It 

 may be distinguished from A. aquila Heilprin by the less alate anterior end 

 and smoother ribs, otherwise they are closely allied. The name imbricata, 

 cited as of Bruguiere, is somewhat doubtfully applicable to this shell, and no 

 diagnosis was given in the Encyclopedic Methodique. It probably retreated 

 to warmer waters during the Miocene invasion of Florida and did not succeed 

 in returning until the end of the Pliocene, as it has not turned up in the 

 Caloosahatchic marls. The form doubtfully identified by Professor Heilprin 

 with A. Listen is connected by a fuller series with the others. 



Area aquila Heilprin. 



PLATE 31, FIGURE 12. 

 Area aquila Heilprin, Trans. Wagner Inst., i., p. 97, pi. 12, fig. 31, 1887. 



Pliocene marls of the Caloosahatchie River, Florida ; Willcox and Dall. 

 This very neat species appears to be somewhat rare, and has only been 

 found at the original locality as yet. 



Area paratina n. s. 

 PLATE 33, FIGURE 14. 



? = A. (Byssoarca) protracta Conr., Journ. Acacl. Nat. Sci. Phila., 2d Ser., i., p. 126, pi. 

 '3. n S- 36, 1848 (not of Rogers, 1837) = subprotracta Heilprin, 1881. 



Oligocene of the Chipola beds on the Chipola River, and of the lower 

 bed at Alum Bluff, Calhoun County, Florida; Dall and Burns. 



Shell elongated, not very thick or high, not much distorted, but with a 

 variable byssal gape, inequilateral, the beaks at or near the anterior fourth ; 

 moderately alate in front and behind ; beaks low, pointed, not inflated, their 



