38 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



whorls flattened on the spire, narrow, bordered at the shoulder by a 

 slightly rounded keel, and separated by a distinct but not deep 

 suture ; the whorls on the spire are not spirally sculptured, but show 

 faint traces of incremental, concavely arcuate lines; last whorl in 

 front of the shoulder smooth, acutely conic, the only sculpture being 

 in the anterior third, which has about a dozen fine spiral threads 

 with wider interspaces becoming more crowded and feebly minutely 

 nodulous anteriorly; on the smooth posterior part of the whorl in 

 certain lights can be seen spiral lines distant and fine, but which 

 appear rather to be in the substance of the shell and do not sculpture 

 the surface; aperture narrow elongate, the canal short and wide; 

 the outer lip sharp, simple and very slightly convexly arcuate. 

 Length of shell 23.8, of aperture 21.5, maximum diameter 12 mm. 



Tampa silex beds at Ballast Point, Tampa Bay, Florida. 



Type-specimen from the Post collection, U. S. Nat. Mus. No. 

 165031. 



Family TUKKITIDAE. 



Genus TURRIS Bolten. 



Turris Bolten (after Rumphius, 1704) Mns. Bolt. 1798, p. 123. First species, 

 Murex bahyloiiiiis Linuaeus (after Turris hahylonica of Rumptiius). — 

 Gray, Proc. Zool. Sec. Lond. for 1847, p. 134, type, T. Mbylonius (Lin- 

 naeus). — H. and A. Adams, Gen. Eec. INIoll., vol. 1, 1853, p. 87. — Gabb, 

 Journ. Acad. Nat. Sci. Phila., vol. 4, 1860, p 378.— Dall, Jonrn. Copch. 

 (Leeds), vol. 11, April, 1906, p. 291; Bull. Mus. Comp. Zool., vol. 43, 

 Ko. 6, 1908, p. 255, not Turris Montfort, 1910, or Turris Lesson, 1837. 



Pleurotoma Lamarck, Prodrome, 1799, p. 73. Sole example, Murex hahy- 

 lonius Linnaeus. 



TURRIS ALBIDA Perry. 



Plate 5, fig. 13 ; plate 14, fig. 7. 



Pleurotoma albida Perry, Couch, expl., pi. 32, fig. 4. 1811. — Dall, Trans. 



Wagner Inst., vol. 3, pt. 1, p. 28, pi. 4, fig. Sn, 1890. 

 Pleurotoma virgo Lamarck, An. s. Vert., vol. 7, p. 94. 1822. 

 Pleurotoma cochlearis Conrad, Journ. Acad. Nat. Sci. Pbila., ser. 2, vol. 1, 



p. 115, pi. 11, fig. 23, 1848. 

 Pleurotoma haitensis Sowerby, Quart. Journ. Geol. Soc. London, vol. 6, p. 



50, 1849. 

 Pleurotoma barretti Guppy, Quart. Jour. Geol. Soc. London, vol. 22, p. 290, 



pi. 17, fig. 6, 1866. 



Oligocene of Vicksburg, Mississippi ; of Santo Domingo and Bow- 

 den, Jamaica; of the Tampa silex beds. Ballast Point, Tampa Bay, 

 Florida ; Pliocene of the Caloosahatchie River, Florida ; living in the 

 Gulf of Mexico and the Antilles in 26 to 125 fathoms. IT. S. Nat. 

 Mus. No. 112083. 



Conrad's figure is very bad, but I have compared specimens with 

 his types. 



