BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 457 



Diplotrypa walkerl Basaler. 



Diplotrypa walked Basaler, BuU. U. S. Geol. Surv., 292, 1906, pp. 47-48, pi. 16, 



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



Clinton (Hochester) : Lockportand Kochester, New York; Grimsby, Ontario. 

 Cotypes Oat. No. 35527, U.S.N.M. 



Diplotrypa westonl Ulrich. 



Diplotrypa westoni Ulrich, 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). 

 Wldteaves, Pal. Foss., 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 Liver 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 Cat. No. 43810, U.S.N.M. 



DIPRION FOLIACEUS Harkness. See Diplograptus foliaceus. 

 DISCINA Hall. 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?? fletcherl Ami. 



Discina fletcheri 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 pannulata. 



DISCINA PELOPEA Billings. See Schizotreta pelopea. 



DISCINA SOLITARIA Ringueberg. See Schizotreta tenuilamellata. 



Discina sublamellosa Ulrich. 



Discina sublamellosa Ulrich, Jour. Cincinnati Soc. Nat. Hist., 1, 1878, p. 97, pi. 

 4, fig. 11. Miller, N. A. Geol. Pal., 1889, p. 344. Schuchert, BuU. 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 TENUISTRIATA Ulrich. See Orbiculoidea tenuistriata. 



