BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 457 



DIplotrypa walkeri Bassler. 



Diplotrypa walkeri Bassler, Bull. U. S. Geol. Surv., 292, 1906, pp. 47-48, pi. 16, 



figd. 1-5; pi. 25, fig. 4. 

 Clinton (r.,ochester) : Lockportand Rochester, New York; Grimsby, Ontario. 

 Cotype3—C2i,i. No. 35527, U.S.N.M. 



Diplotrypa westonl Ulrich. 



Diplotrypa westoni UWch, Contr. Micro-Pal. Cambro-Sil., pt. 2, 1889, p. 30, 

 pi. 8, figs. 4-4b; Zittel's Textb. Pal. (Engl, ed.), 1896, fig. 457 (p. 274).— 

 Whiteaves, Pal. Fobs., 3, pt. 3, 1897, p. 163.— Bassler, Bull. U. S. Nat. Mus., 

 77, 1911, p. 323, fig. 201; Zittel-Eastman Textb. Pal., 1913, p. 338. 



Black river or Richmond: Big Island, Lake Winnipeg, Manitoba. 



Ordovician (Chasmops): Nittsjo Ratvik, Dalarne, Sweden, and south of Boda- 

 hamn, island of (Eland, Baltic Sea. 



Part of holotype.—Q&t. No. 43810, U.S.N.M. 



DiPRiON FOLiACEUs Harkness. See Diplograptus foliaceua. 



DisciNA HaU. See Orbiculoidea D'Orbigny. 



DisciNA ciECE Billings. See Orbiculoidea lamellosa. 



DisciNA CLARA Spencer. See Schizotreta tenuilamellata. 



DisciNA coNCORDENSis Sardeson. See Schizotreta pelopea. 



DisciNA DEFORMis Lincklaen. See Archinacella deformata. 



Discina?? fletcheri Ami. 



Discina iletcheri Ami, Proc. and Trans. Nova Scotian Inst. Sci., 8, 1895, p. 412. 

 Silurian: Antigonish County, Nova Scotia. 



Discina forbesi, Nicholson. See Schizotreta tenuilamellata. 



Discina lamellosa Hitchcock. See Orbiculoidea lamellosa. 



Discina?? novascotica Ami. 



Discina novascotica Ami, Proc. and Trans. Nova Scotian Inst. Sci., 8, 1895, 



p. 412. 

 Silurian: Antigonish County, Nova Scotia. 



Discina?? orientalis Ami. 



Discina orientalis Ami, Proc. and Trans. Nova Scotian Inst. Sci., 8, 1895, p. 413. 

 Silurian: Antigonish County, Nova Scotia. 



Discina parmulata Lincklaen. See Orbiculoidea parmulata. 



Discina pelopea Billings. See Schizotreta pelopea. 



Discina solitaria Ringueberg. See Schizotreta tenuilamellata. 



Discina sublamellosa Ulrich. 



Discina sublamellosa Ulrich, Jour. Cincinnati Soc. Nat. Hist., 1, 1S78, p. 97, pi. 

 4, fig. 11.— Miller, N. A. Geol. Pal., 1889, p. 344.— Schuchert, Bull. U. S. 

 Geol. Surv., 87, 1897, p. 218. 

 Eden (Economy): Covington, Kentucky. 

 Observation. — Probably not a brachiopod; possibly a pelecypod. 



Discina tenuilamellata var. subplana Hall. See Orbiculoidea subplana. 



Discina tenuistrlata Ulrich. See Orbiculoidea tenuistriata. 



