BIBLIOGRAPHIC LIST OF GENERA AXD SPECIES. 1147 



Schizotreta 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 Scliuchert, 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. 

 ?Richniond (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., 18S2, 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 eer., 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 Uhich. 



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

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

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



Schmidtella afflnis Uhich. 



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

 Trenton (Prosser): Near Cannon Falls, Minnesota. 

 Coty pes. —Cat. No. 41296, U.S.N.M. 



Schmidtella brevis Ulrich. 



Schmidtella brevis Uhich, 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 Uhich. 



Schmidtella crassimajghiata 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.— Cat. 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 2—15 28 



