304 BULLT'ITIX T)!}, UNITKD STATP:S NATIONAL MUSEUM. 



249. Helcion sexsulcatus Meek and Hayden. Holotype. 



Montana (Cret. ). Yellowstone River, near Miles City, 

 Montana. 

 Meek and Hayden, Proc. Acad. Nat. Sci. Pliila., VIII, 1856, p. 68. 

 = Anisoniyon sexsulcatus. 



244. Helcion subovatus Meek and Hayden. Holotype. 



Montana (Cret.). Yellow.stone River, Montana. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., VIII, 1S56, p. 68. 

 = Anisoniyon subovatus. 



45827. Helcionopsis striata Ulricli. Holotj'pe. 



Richmond (Ord.). Marion County, Kentucky. 



Ulrich, Geol. and Nat. Hist. vSnrv. Minn., Final Rept., Ill, Pt. II, 

 1897, p. 827, pi. 61, fifjs. 29, 30. 



45828. Helcionopsis subcarinata Ulrich and Scofield. Cotypes. 



Trenton (Ord.). Goodhue County, Minnesota. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Pt. II, 1897, p. S27, pi. 61, fig. 28. 



18324. Helenia bella Walcott. Cotype. 



lyower Cambrian. Conception Bay, Newfoundland. 



Walcott, Proc. U. S. Nat. Mus., XII, 1889, p. 39; Tenth Ann. Rept. 

 U. vS. Geol. Surv., 1890, p. 616, pi. 78, figs. 4-4b. 



111939. Helicina ballista Dall. Cotypes. 



111941. Oligocene. Ballast Point, Tampa, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, p. 3, 

 pi. I, figs. 2, 2a. 



1 1 1943. Helicina ballista tampae Dall. Cotypes. 



Oligocene. Ballast Point, Tampa, Florida. 



Dall, Trans. Wagner Free Inst. vSci. Phila., Ill, Pt. I, 1890, p. 4. 



474. Helicoceras angulatum Meek and Hayden. Holotype. 



Fort Pierre ( Cret. ). Head of .south branch of Cheyenne 

 River, South Dakota. 

 Meek and Hayden, Proc. Acad. Nat. vSci. Phila., for i860, p. 176. 

 = Heteroceras ? angulatum. 



22934. Helicoceras ? corrugatum Stanton. Holotype. 



Colorado ( Cret. ). Turkey Creek, Huerfano Park. Colorado. 



vStanton, Bull. No. 106, U. S. Geol. Surv., 1893, p. 165, pi. 35, fig. 5. 



473. Helicoceras mortoni tenuicostatum Meek. Cotypes. 



Fort Pierre (Cret.). Great Bend of the Mi.s.souri, below 

 •* Fort Pierre, vSouth Dakota. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1876, p. 487, pi. 22, figs. 

 3a-c. 



See Helicoceras tenuico.status. 



