Fauna op orthaulax pugnax zone. 105 



Family XENOPHOEIDAE. 



Genus XENOPHORA Fischer de Waldheim. 



Xenophora Fischer de Waldheim, Tab. Syn. Zoogn.. p. 113, 1808. 



XENOPHORA CONCHYLIOPHORA Born. 



Plate 15, figs. 1, 3. 



Trochus conchyUophorus Born, Mus. Caes. Vind., index, p. 333, 1778. 

 Xenophora laevigata Fischer de Waldheim, Tab. Syu. Zoogu.. p. 113, 1808. 

 ? Trochus leprosus Morton, Syu. Org. Rem., p. 46, pi. 15, fig. 6, 1834. 

 Phones reclusus Conrad, Proc. Acad. Nat. Sci., vol. 7, p. 262, 1855; Wailes' 



Geol. Miss., p. 289, pi. 17, figs. 6o, 6&, 1854. 

 Onustus reclusus Conrad, Amer. Jouru. Conch., vol. 1, p. 33, 1865. 

 Xenophora agglutinans De Gregorio, Mon. Eoc. Ala., p. 144, 1890, not of 



Lamarck. 

 Xenophora reclusa De Gregobio, Mon. Eoc. Ala., p. 144. 

 Xenophora humilis Dall, Trans. Wagner Inst., vol. 3, pt. 1, p. 182, figs. 



10, lOo, 1890, not of Conrad. 

 Xenophora conchyliophora Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 360, 



1892. 



In the " Ripley *' Cretaceous of Alabama, at Prairie Bluff, Morton 

 and Conrad; the Eocene of Woods Bluff, iVlabama, and of Jackson, 

 Mississippi, Aldrich, Wailes, and Conrad; Oligocene of the Tampa 

 silex beds, of the superincumbent limestone at Bartow, and of the 

 Chipola River marl in Florida; the Miocene of Cape Fear River, 

 North Carolina, at Mrs. Purdy's marl bed, C. W. Johnson ; Pliocene 

 of the Caloosahatchie River and Shell Creek, Florida ; and living in 

 moderate depths of water off the eastern coast of the United States 

 from Cape Hatteras to the Gulf of Mexico, and through the Antilles. 



The groups Xenophora s. s. and Tugurium which are sufficiently 

 distinct in the existing fauna, as we recede in Tertiary time become 

 merged so far as to be indistinguishable. 



Family NATICIDAE. 

 Genus NATICA Scopoli. 



Natica (Adanson) Scopoli, Intr. Hist. Nat., p. 392, 1777. — BruguiJ:re, 

 Encycl. Metli., vol. 1, p. XVI, 1789. — Lamarck, Prodrome, p. 77, 1799. — 

 Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 366, 1892. 



Cochlis Bolten, Mus. Bolteu, p. 146, 1798. 



Nacca Risso, Hist. Nat. Eur. Merid., vol. 4, 1826, p. 148. Nerita fulniinea 

 (Linnaeus) Gmelin. 



Subgenus CRYPTONATICA Dall. 



Cryptonatica Dall, Trans. Wagner Inst., vol. 3, pt. 2, pp. 362, 366, 1892. 

 Type, 2V. clausa Broderip and Sowerby. 



This group has the shelly operculum smooth and without grooves, 

 and the umbilicus completely filled with a smooth callus. 



