BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 595 



HELCION ORBICULATUS D'Orbigny. See Archinacella orbiculatus. 

 HELCION PATELLIFORMIS D'Orbigny. See Archinacella patelliformis. 



HELCIONOPSIS Ulrich and Scofield. Genotype: H. striata Ulrich. 



Helcionopsis Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, pp. 821, 826. 

 Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 604. 



Helcionopsis striata Ulrich. 



Helcionopsis striata Ulrich, Geol. Minnesota, 3, pt. 2, 1897, p. 827, pi. 61, figs. 29 

 and 30. (H. fissicostata in error, p. 821.) Grabau and Shimer, N. A. Index 

 Fossils, 1, 1909, p. 604, fig. 805a, b. Foerste, Jour. Geol., 11, 1903, p. 37. 

 Triblidium striatum Miller, N. A. Geol. Pal., 2d App., 1897, p. 771 (gen. ref.). 

 Richmond: Marion County, Kentucky. 

 Maysville: Cincinnati, Ohio. 

 Eolotype.C&t. No. 45827, U.S.N.M. 



Helcionopsis subcarinata Ulrich and Scofield. 



Helcionopsis subcarinata Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, p. 



827, pi. 61, fig. 28. 



Trenton (Prosser): Goodhue County, Minnesota. 

 Cotypes. Cat. No. 45828, U.S.N.M. 



HELENTEROPHYLLUM Grabau. Genotype: H. caliculoides Grabau. 



Helenterophyllum Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, p. 95. 



Helenterophyllum caliculoides Grabau. 



Helenterophyllum caliculoides Grabau, Michigan Geol. Surv., Geol. Ser., 1, 1909, 



p. 95, pi. 11, figs. 2-3. 



Upper Monroan (Anderdon): Anderdon quarry near Amherstburg, Ontario. 

 Cayugan (Manlius): Manlius, New York. 



HELICOGRAPSUS Nicholson. See Nemagraptus Emmons. 



HELICOPORA Claypole. Genotype: H. latispiralis Claypole. 



Helicopora Claypole, Proc. Amer. Assoc. Adv. Sci., 30, 1881, p. 191; Quar. Jour. 

 Geol. Soc. London, 39, 1883, p. 32. Waagen and Pichl, Pal. Indica, ser. 13, 

 1885, p. 774. Ulrich, Contr. Amer. Pal., 1, 1886, p. 5. Miller, N. A. Geol. Pal., 

 1889, p. 308. Ulrich, Geol. Surv. Illinois, 8, 1890, p. 396. Simpson, 13th 

 Ann. Rep. State Geol. New York for 1893, 1895, pp. 722, 726; 47th Ann. Rep. 

 New York State Mus., pp. 916, 920. Ulrich, Zittel's Textb. Pal. (Engl. ed.), 

 1896, p. 282. Simpson, 14th Ann. Rep. State Geol. New York for 1894, 1897, 

 pp. 517, 522. Nickles and Bassler, Bull. U. S. Geol. Surv., 173, 1900, p. 39. 



Helicopora latispiralis Claypole. 



Helicopora latispiralis Claypole, Proc. Amer. Assoc. Adv. Sci., 30, 1881, p. 191; 

 Quar. Jour. Geol. Soc. London, 39, 1883, p. 32, pi. 4, figs. 1, la. Simpson, 

 14th Ann. Rep. State Geol. New York for 1894, 1897, fig. 70, 1 (p. 518). 



Niagaran: Cedarville, Greene County, Ohio. 



HELICOTOMA Salter. Genotype: H. planulata Salter. 



Helicotoma Salter, Canadian Org. Rem., Geol. Surv. Canada, dec. 1, 1859, p. 13. 

 Nicholson, Rep. Pal. Prov. Ontario, pt. 1, 1874, p. 120. Miller, N. A. Geol. 

 Pal., 1889, p. 405. Koken, Neues Jahrb. f. Min., Pal., 1, 1898, p. 24; Bull, de 

 1'Acad. Imp. Sci. St. Petersburg, 7, 1897, p. 159. Ulrich and Scofield, Geol. 

 Minnesota, 3, 1897, p. 1032. Grabau and Shimer, N. A. Index Fossils, 1, 1909, 

 p. 658. 



