BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 1147 



Schlzotreta pelopea (Billings). 



Discina Pelopea Billings, Pal. Fossils, 1, Geol. Surv. Canada, 1865, p. 52, fig. 56 



(adv. sheets, 1862); Geol. Canada, 1863, p. 159, fig. 124. 

 Discina concordensis Sardeson, Bull. Minnesota Acad. Nat. Sci., 3, 1892, p. 328, 



pi. 4, figs. 13, 14. 

 Schizotreta pelopea, Winchell and Schuchert, Geol. Minnesota, 3 ; 1893, p. 365, 



pi. 29, figs. 26-28. Grabau and Shimer, N. A. Index Fossils, 1, 1907, p: 205, 



fig. 241a-b. 



Trenton: Montreal, etc., Canada; Minnesota; Iowa; Wisconsin. 

 ?Richmond (Maquoketa) : Spring Valley, Minnesota. 



Schizotreta tenuilamellata (Hall). 



Orbicula tenuilamellata Hall, Pal. New York, 2, 1852, p. 250, pi. 53, fig. 3. 

 Discina forbesi Nicholson (not Davidson), Pal. Prov. Ontario, 1875, p. 62. 

 Discina solitaria Ringueberg, Amer. Nat., 1882, p. 175, figs. a-e. 

 Discina clara Spencer, Bull. Univ. State Missouri, 1, 1884, p. 56; Trans. St. Louis 



Acad. Sci., 4, 1886, p. 606, pi. 8, fig. 5. 

 Schizotreta tenuilamellata Beecher, Amer. Jour. Sci., 3d ser., 41, 1891, p. 357, 



pi. 17, fig. 11. Grabau and Shimer, N. A. Index Fossils, 1, 1907, p. 205. 

 Orbiculoidea (Schizotreta?) tenuilamellata Hall and Clarke, Pal. New York, 8, 



pt. 1, 1892, pp. 127, 135, pi. 4E, figs. 9-11; pi. 4F, figs. 2-6. 

 Niagaran: Lockport, New York (Lockport); Hamilton, Ontario (Rochester); 



Arisaig, Nova Scotia (Arisaig). 



SCHMIDTELLA Ulrich. Genotype: S. crassimarginata Ulrich. 



Schmidtella Ulrich, Amer. Geol., 10, 1892, p. 269. Miller, N. A. Geol. Pal., 1st 

 App., 1892, p. 711. Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 639. Grabau 

 and Shimer, N. A. Index Fossils, 2, 1910, p. 343. 



Schmidtella afflnis Ulrich. 



Schmidtella affinis Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 641, pi. 43, figs. 45-47. 

 Trenton (Prosser): Near Cannon Falls, Minnesota. 

 Coupes. Cat. No. 41296, U.S.N.M. 



Schmidtella brevis Ulrich. 



Schmidtella brevis Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 642, pi. 45, figs. 



34, 35. 



Black River (Decorah): Near Fountain, Minnesota. 

 Holotype.Cat. No. 41299, U.S.N.M. 



Schmidtella crassimarginata Ulrich. 



Schmidtella crassimarginata Ulrich, Amer. Geol., 10, 1892, p. 269, pi. 9, figs. 

 27-30. Miller, N. A. Geol. Pal., 1st App., 1892, p. 711, fig. 1265. Ulrich, 

 Geol. Minnesota, 3, pt. 2, 1894, p. 640, pi. 43, figs. 42-44. Grabau and Shimer, 

 N. A. Index Fossils, 2, 1910, p. 343, figs. 1656o-q. Raymond, Ann. Carnegie 

 Mus., 7, 1911, p. 256, fig. 27. 



Black River (Platteville) : Mineral Point, Wisconsin; Dixon, Illinois. 



Chazyan (Valcour) : Valcour Island, New York. 



Holotype.C&t. No. 41295, U.S.N.M. 



Schmidtella crassimarginata ventrilabiata Ruedemann. 



Schmidtella crassimarginata var. ventrilabiata Ruedemann, Bull. New York 



State Mus., 49, 1901, p. 75, pi. 7, figs. 12-18. 



Mohawkian (Rysedorph) : Rysedorph Hill, Rensselaer County, New York. 

 84243 Bull. 92 vol 215 28 



