BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 597 



Helfcotoma perstrfata Billings. 



Helicotoma perstriata Billings, Canadian Nat. Geol., 4, 1859, p. 356. 

 Chazyan (Mingan): Mingan Islands, Quebec. 



Helicotoma planulata Salter. 



Helicotoma planulata Salter, Can. Org. Hem., Geol. Surv. Canada, dec. 1, 1859, 

 p. 14, pi. 2, figs. 5-7. Hall, Rep. Geol. Surv. Wisconsin, 1862, p. 39, 

 fig. 3; p. 439. Chamberlin, Geol. Wisconsin, 1, 1883, p. 157. Whiteaves, 



I Canadian Rec. Sci., 5, 1893, p. 323 (loc. occ.). Ulrich and Scofield, Geol. 



Minnesota, 3, pt. 2, 1897, p. 1033, pi. 74, figs. 16-17. Grabau and Shimer, 

 N. A. Index Fossils, 1, 1909, p. 658, figs. 906h, i. 

 Black River: Allumette Island, Ottawa River, etc. (Leray), Canada; Lincoln 

 County, Missouri; Wisconsin; New York. 

 Plesiotypes Cat. No. 45831, U.S.N.M. 



HELICOTOMA PLANULATA var. MURICATA Salter. See Helicotoma muricata. 



Helicotoma planulata robusta Ulrich and Scofield. 



Helicotoma planulata var. robusta Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 



1897, p. 1033, pi. 74, fig. 15. 



Black River (Platteville) : Jo Daviess County, Illinois. 

 Holotype.C&t. No. 45832, U.S.N.M. 



Helicotoma planulatoides Ulrich. 



Helicotoma planulatoides Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 1034, pi. 74, 



figs. 28-30. 



Black River (Lowville): High Bridge, Kentucky; Tennessee. 

 Holotype Cat. No. 45833, U.S.N.M. 



Helicotoma proserpina Billings. 



Helicotoma Proserpina Billings, Pal. Fossils, 1, Geol. Surv. Canada, 1865, p. 247, 



fig. 233. 

 Canadian (Quebec G): Cape Norman, Newfoundland. 



Helicotoma slmllls Whitfield. 



Helicotoma similis Whitfield, Bull. Amer. Mus. Nat. Hist., 3, 1890, p. 31, pi. 1, 



figs. 1, 2. Sardeson, Jour. Geol., 11, 1903, p. 481, fig. 19. Seely, Vermont 



State Geol., Rep. 7, 1910, pi. 56, fig. 2. 

 Canadian (Beekmantown): Providence Island, Lake Champlain, Vermont. 



Helicotoma? spinosa Salter. 



Helicotoma? spinosa Salter, Geol. Surv. Canada, dec. 1, 1859, p. 15, pi. 2, 



figs. 9, 10. 

 Black River (Leray) : Allumette Island, Ottawa River, Canada. 



Helicotoma subquadrata Ulrich. 



Helicotoma subquadrata Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 1034, pi. 70, 



figs. 31-33. 



Stones River (Murfreesboro) : Murfreesboro, Tennessee. 

 Cotypes.C&t. No. 46058, U.S.N.M. 



Helicotoma tennesseensts Ulrich and Scofield. 



Helicotoma tennesseensis Safford, Geol. Tennessee, 1869, p. 288 (nom. mid.). 



Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 1034, pi. 74, figs. 



20-24. Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 659, figs. 906j, k. 

 Stones River (Murfreesboro): Murfreesboro, Tennessee. 

 Cotypes. Cat. No. 46059, U.S.N.M. 



