FAUNA OF ORTHAULAX PUGNAX ZONE. 109 



Genus SINUM Boltcn. 



Sinum Bolten, Mus. Boltenianum, 1798, p. 14. Type, Heliop haliotoidea 

 (Linnaeus) Gmelin, Syst. Nat., vol. 6, p. 3663, 1792, ex parte.— Ball, 

 U. S. Geol. Surv. Prof, paper No. 59, p. 91, 1909. 



Sigaretus Lamarck, Prodrome, 1799, p. 77. Same type. 



Gnjptostoma Blainvilt.e, 1817. 



Catinus H. and A. Adams, 1853 ; not of Oken, 1815. 



SINUM CHIPOLANUM Ball. 

 Plate 12, fig. 29; plate 16, fig. 1. 



Siffftretus chipolaniis Dall, Trans. Wagner Inst., vol. 3, pt. 2, p. 379, pi. 

 17, fig. 7, 1892. 



Oligocene of the Tampa silex beds at Ballast Point, also of the 

 Chipola marl, Calhoim County, Florida ; Dall. U. S. Nat. Mus. No. 

 165135. 



This species is most nearly related to the /S. declive Conrad, of the 

 Claibornian Eocene, from which it is separable by its closed umbili- 

 cus and the absence of the emargination of the pillar, which is a 

 characteristic of S. declive. The Chipola specimens are larger and 

 finer than any yet obtained at Ballast Point. 



SINUM IMPERFORATUM, new species. 



Plate 5, fig. 8. 



Shell small, elevated, solid, of about 5 whorls, of which the nuclear 

 2^ appear smooth; subsequent whorls sharply densely grooved, the 

 grooves having a tendency to pair, and the interspaces flattened; 

 both grooves and interspaces are minutely zigzagged by the inter- 

 section with them of the incremental lines; spire moderately ele- 

 vated, suture distinct; aperture oblique, the outer lip joining the body 

 above the periphery of the preceding whorls; inner or pillar lip 

 thickened, with a slight depression behind it, but no umbilical chink. 

 Height of shell 13.2, of aperture 11.7, maximum diameter 11 mm. 



Tampa silex beds from the vicinity of the Hillsboro river, Florida, 

 collected by E. J. Post. U. S. Nat. Mus. No. 166107. 

 " This species has some resemblance to S. fragile Conrad, but is 

 much more solid and the characters of the sculpture and of the 

 lunbilical region differ. 



Family TURBINIDAE. 



Genus TURBO (Linnaeus) Lamarck. 



Turbo Linnaeus, Syst. Nat., ed. 10, p. 761, 1758. — Lamarck, Prodrome, p. 74, 

 1799. Type, T. marmoratics Linnaeus. 



The original group was very heterogeneous, but by common con- 

 sent the name has been restricted to shells of the type of T. marmo- 

 ratus Linnaeus, which was Lamarck's monotype in 1799. 



