120 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Oligocene of the Tampa silex beds at Ballast Point (fragment) ; 

 Pliocene marls of the Caloosahatchie River, Alligator Creek, and 

 Shell Creek, south Florida; Dall and Burns. U. S. Nat. Mus. No. 

 348949. 



The fragment from Ballast Point collected by Mr. Willcox appears 

 to accord specifically with the typical Pliocene form. 



BARBATIA (CALLOARCA) ARCULA Heilprin. 

 Plate 17, flg. 5. 



Area nrcula Heilprin, Trans. Wagner Inst., vol. 1, p. 118, pi. 16, flg. 65, 1887. 

 Barhatia (Calloarca) arcula Dall, Trans. Wagner Inst., vol. 3, pt. 4, p. 624, 

 pi. 33, fig. 4, 1898. 



Tampa silex beds at Ballast Point, Tampa Bay ; Willcox and Post. 



U. S. Nat. Mus. No. 107718. 



Section AGAR (Gray) Adams. 



Acar (Gray) H. and A. Adams, Gen. Rec. Moll., vol. 2, p. 535, 1857; Area 

 donaciformis Reeve. — Dall, Trans. Wagner Inst., vol. 3, pt. 4, 1898, 

 p. 615. 



Daphnoderma Morch, 1853, not of Poll, 1795. 



BARBATIA (ACAR) RETICULATA Gmelin. 



Area reticulata Gmklin, Syst. Nat., vol. 6, p. 3311. 1702. — Chemnitz, Conch. 



Cab., vol. 2, p. 193, pi. 54, fig. 540. 

 Area squamosa Lamarck, Anim. s. Vert., vol. 6, p. 35, 1819. 

 Area domingensis Lamarck, Anim. s. Vert., p. 40, 1819. 

 Area elathrata Lamarck, Anim. s. Veit., p. 46, 1819. 

 1 Area gradata Broderip and Sowerby, Zool. Journ., vol. 4, p. 365, 1829. 

 Area divaricata Sowebby, Proc. Zool. Soc, 1833, p. 18. — Reeve, Conch. Icon. 



Area, pi. 16, fig. 108, 1844. 

 Bariatia (Acar) reticulata Dall, Trans. Wagner Inst., vol 3, pt. 4, p. 



629, 1898. 



Eocene of the Jacksonian at Moody's branch, Jackson, Missis- 

 sippi; Oligocene of the Bowden beds, Jamaica, West Indies, of 

 the island of Trinidad, at Matura ; of the Tampa silex beds at Bal- 

 last Point, Tampa Bay, and of the Chipola River marls; Pliocene 

 of the Caloosahatchie River, Florida, and of Limon, Costa Rica; 

 Pleistocene of the Antilles, generally; and living from Cape Hat- 

 teras. North Carolina, North Carolina, south to Barbados and the 

 Gulf of Campeche, Mexico. U. S. Nat. Mus. No. 165178. 



The fossils are identical with the living shells, and there can be 

 no doubt that the species has existed, with its mutations essentially 

 as at present, in the Antillean region since the upper Eocene. 



