124 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



This fine 03^stei' does not agree witli any of the described species 

 of the Oligocene of the coastal plain, and is named in honor of Dr. 

 T. Wayland Vaiighan, who has been in charge of the geological 

 exploration of that region for some years. 



Family PECTINIDAE. 



Genus PECTEN Muller. 



Pecten (Klein, 1753) Muller, Zool. Don. Prodr., p. ^8, 1766.— Da Costa, 

 Brit, Coneh., p. 140, 1778. — Bolten Mus. Bolt., p. 165, 1798. — Lamarck, 

 Prodrome d'uu Nouveau Class. Coq., p. 88, 1799. — Verrill, Trans. Conn. 

 Acad. Sci., vol. 10, pp. 41-47, 1897. — Dall, Trans. Wagner Inst., vol. 3, 

 pt. 4, pp. 689-758, 1898. Type P. maximus Muller i=^Ostrea maxima 

 Linnaeus). 



Subgenus CHLAMYS Bolten. 



Chlamys Bolten, Mus. Bolt., p. 161, 1798. Type, Pecten islandicus Muller. 



Section AEQUIPECTEN Fischer. 



Aequipecten Fischer, Man. de Conchyl., p. 944, 1886. Type, Pecten oper- 

 culars Linnaeus. 



PECTEN (AEQUIPECTEN) CHIPOLANUS Dall. 

 Plate 23, fig. 2. 



Pecten (Aequipecten) chipolanus Dall, Trans. Wagner Inst., vol. 3, p. 733, 

 pi. 29, fig. 9, 1898. 



Oligocene of the Tampa silex beds at Ballast Point; of the lower 

 bed at Alum Bluff, Chattahoochee River; and the Chipola marl of 

 the Chipola River, Calhoun County, Florida; Dall and Burns. 

 U. S. Nat. Mus. No. 114T84. 



Family SPONDYLIDAE. 



Genus SPONDYLUS Linnaeus. 



Spondylus Linnaeus, Syst. Nat., ed. 10, p. 610, 1758. Type, Spondylus 

 gaederopufi Linnaeus. 



SPONDYLUS BOSTRYCHITES Guppy. 

 Plate 19, fig. 4. 



Spondylus Ufrons Sowerby, Quart. Journ.. Geol. Soc. Lond., vol. 6, p. 53, 

 1849; not of Goldfuss, Petref., vol. 2, p. 99, pi. 106, figs. 10 a^c, 1835. 



Spondylus hostrychites Guppy, Proc. Sci. Soc. Trinidad, p. 176, 1867.— 

 Gabb, Geol. Santo Domingo, p. 257, 1873. — Dall, Trans. Wagner lust., 

 vol. 3, pt. 4, p. 758, 1898. 



Oligocene of the Tampa silex beds and of the limestone of White 

 Beach, near Osprey, Florida; of Santo Domingo at Ponton; the 

 Bowden beds of Jamaica and of Anguilla, West Indies. U. S. N. 

 Mus. No. 165182. 



