FAUNA OF OBTHAULAX PUGNAX ZONE. 79 



There is more or less variation in the amplitude of the umbilicus. 

 Ecphora quadricostata is unknown from the Oligocene. 



RAPANA BICONICA. new species. 

 Plate 13, fig. 10. 



Shell heavy, solid, biconic, of 5 or 6 whorls (the nucleus defective 

 in the specimen) ; spire less than half as long as the aperture, short 

 conic with flattish slopes; suture distinct, on the early whorls a 

 little undulated as if by obsolete ribs; axial sculpture chiefly of 

 rather prominent incremental lines, which give a rough feel to the 

 surface; spiral sculpture of a well-marked carina at the periphery 

 and between the sutures about 10 revolving threads, of which the 

 anterior half are rather smaller than the others; in front of the 

 periphery of the last whorl are 4 more flattened cords separated by 

 narrow grooves and mostly with a smaller groove dividing the 

 flattened surface of the cord; in front of these are 10 or 12 wider 

 straplike revolving ridges, of which the surface is divided usually 

 by two smaller grooves and which extend to the canal ; aperture 

 subquadrate ; outer lip thin, sharp, crenulate by the spiral sculpture ; 

 body with the sculpture erased; pillar smooth, slightly twisted; 

 siphonal fasciole strong with a deep chinlc between it and the an- 

 teriorly reflected pillar; canal wide, rather long, and a little re- 

 curved. Height of shell 51, of aperture 32, maximum diameter of 

 shell 25 mm. 



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

 Post, TJ. S. Nat. Mus., No. 165092. 



Family EULIMIDAE. 



Genus MELANELLA Bowdich. 



Melanella Bowdich, Elem. Conch., vol. 1, p. 27, 1822, type, M. dufresnii 

 Bowdich, Elem. Conch., vol. 1, pi. 6, fig. 17. — Dall, Rep. BlaJce Gastr. 

 Bull. Mus. Comp. Zool., vol. 18, p. 326, June, 1889. — Fischee, Journ. de 

 Conchyl., vol. 25, 1887, p. 197. Not Melanella Bory St. Vincent, 1824, 

 Swainson, 1840, or Morch 1852. 



Eulima Risso, Hist. Nat. Eur. Mer., vol. 4, 1826, p. 123; first species, E. 

 elegantissima Risso { = TurJ)o poUtns Gmelin, fide Jeffreys) ; only 

 figured species E. suhulata Brocchi, 1814, which is a fossil extremely 

 close to Turho sithulata Donovan, 1804. 



Balcis (Leach MS. 1S19) Gray, Ann. Mag. Nat. Hist., vol. 20, 1847, 

 p. 271. First species. Helix polita Montagu' (as B. montagui Leach) ; 

 Proc. Zool. Soc. London, 1847, p. 160, example named by Gray, "Helix 

 stihulata." 



Leiostraca H. and A. Adams, Gen. Rec. Moll., vol. 1, 1S53, p. 237. Type, L. 

 vietcalfei A. Adams. Gen. Rec. Moll., vol. 3, pi. 25, fig. 3a. Not Leio- 

 stracus Albers, 1850, nor Liostracits Martens, 1860. 



