1112 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Rhlpldomella hybrida (Sowerby). 



Orthia hybrida Sowerby, Murcbison's Sil. Syat., 1839, p. 630, pi. 13, fig. 11.— 

 Hall, Geol. New York; Rep. 4th Dist., 1843, p. 105, fig. 7; Pal. New York, 

 2, 1852, p. 253, pi. 52, fig. 4. — Roemer, Die Sil. Fauna West. Tennessee, 

 1860, p. 63, pi. 5, fig. 6.— Emmons, Man. Geol., 1860, p. 109, fig. 99.— Meek 

 and Worthen, Geol. Surv. Illinois, 1868, p. 371, pi. 7, fig. 7.— Hall, 28th 

 Rep. New York State Mus. Nat. Hist., 1879, p. 149, pi. 21, figs. 18-25; 11th 

 Rep. State Geol. Indiana, 1882, p. 285, pi. 21, figs. 18-25; 2d Ann. Rep. New 

 York State Geol., 1883, pi. 36, figs. 1-5,— Foerste, Bull. Sci. Lab. Denison 

 Univ., 1, 1885, p. 83, pi. 13, fig. 10.— Beecher and Clarke, Mem. New York 

 State Mus., 1, 1889, p. 17, pi. 1, figs. 13-18.— Nettelroth, Kentucky Fossil 

 Shells, Mem. Kentucky Geol. Surv., 1889, p. 39, pi. 32, figs. 32-35.— Lesley, 

 Geol. Surv. Pennsylvania, Rep. P 4, 1889, p. 517, figs. 



Orthis hybrida? Hall, Trans. Albany Inst., 4, 1863, p. 209. 



Rhipidomella hybrida Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 210, 

 224, pi. 6, figs. 1-5.— Grabau, Bull. New York State Mus., 45, 1901, p. 188, 

 fig. 98; Bull. Buffalo Soc. Nat. Sci., 7, 1901, p. 188, fig. 98.— Kindle and 

 Breger, 28th Rep. Ann. Dep. Geol. Nat. Res. Indiana, 1904, p. 433, pi. 2, 

 fig. 8.— Grabau and Shinier, N. A. Index Fossils, 1, 1907, p. 263, fig. 315.— 

 Savage, Bull. Geol. Surv. Illinois, 23, 1913, pi. 7, fig. 10. 



Orthis (Rhipidomella) hybrida Foerste, Geol. Ohio, 7, 1895, p. 584, pi. 25, fig. 10. 



Dalmanella cf. hybrida Clarke and Ruedemann, Mem. New York State Mus., 5, 

 1903, pi. 4, p. 42, figs. 7, 8. 



Silurian: Europe; many localities in the Niagaran of the United States and 

 Canada. 



Plesiotype— Cat. No. 51346, U.S.N.M. 



Rhipidomella lenticularis Foerste. 



Rhipidomella lenticularis Foerste, Jour. Geol., 11, 1903, p. 711; Bull. Sci. Lab. 

 Denison Univ., 14, 1909, pi. 2, figs. 28A, B, p. 72. 



Niagaran (Brownsport) : Brownsport Furnace, 3 miles west of Vice Landing, Ten- 

 nessee. 



Rhipidomella niagnicardinalis Foerste. 



Rhipidomella magnicardinalis Foerste, Cincinnati Soc. Nat. Hist. Jour., 21, 1909, 



p. 27, pi. 1, fig. lla-d, pi. 2, fig. 12A, B. 

 Clinton (W>est Union): Big Salt Lick Creek, Lewis County, Kentucky. 



Rhipidomella media Schuchert. See Dalmanella elegantula media. 



Rhipidomella newsomensis Foerste. 



Rhipidomella newsomensis Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 



73, pi. 4, figs. 72A, B. 

 Niagaran (Waldron): Newsom, Tennessee; Hartsville, Waldron, etc., Indiana. 



Rhipidomella preoblata Weller. 



Rhipidomella preoblata Weller, Geol. Surv. New Jersey, Pal., 3, 1903, p. 232, 



pi. 20, figs. 25, 26. 

 Helderbergian (Decker Ferry): Two miles south of Tristates, New York. 



Rhipidomella rhynchonellipobmis Schuchert. See Rhipidomella uberis rhyncho- 

 nelliformis. 



Rhipidomella saffordi Foerste. 



Rhipidomella saffordi Foerste, Jour. Geol., 11, 1903, p. 711; Bull. Sci. Lab. 



Denison Univ., 14, 1909, p. 72, pi. 1, figs. 17A-C. 

 Niagaran (Brownsport): Gant Place, Pegram, Bath Springs, and near Savannah, 

 Tennessee. 



