BIBLIOGRAPHIC LJST OF GENERA AND SPECIES. 73 



Arthrorhachis galba (Billings). 



Agnostus Galba Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 297, fig. 288. 



Vogdes, Amer. Geol., 9, 1892, p. 395, pi. 9, fig. 6. Bassler, Bull. Geol. Surv. 



Virginia, 2a, 1909, p. Ill, figs. 10, 2-5. 

 Chazyan: Table Head, Pistolet Bay, and four miles northeast of Portland Creek, 



Newfoundland (Quebec M, N, P); Lexington, Virginia (Liberty Hall). 



ARTHROSTYLUS Ulrich. Genotype: Helopora tenuis James. 



Arthronema (preoccupied) Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, pp. 

 151, 160; Pocta, Syst. Sil. Centre Boheme, 8, pt. 1, 1894, p. 14. 



Arthrostylua Ulrich, American Geologist, 1, 1888, p. 230. Miller, N. A. Geol. 

 Pal., 1889, p. 293. Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 188; 

 Geol. Surv. Illinois, 8, 1890, p. 400; Geol. Minnesota, 3, 1893, p. 187; Zittel's 

 Textb. Pal. (Engl. ed.), 1896, p. 280. Simpson, 14th Ann. Rep. State Geol. 

 New York for 1894, 1897, p. 527. Nicklea and Bassler, Bull. U. S. Geol. 

 Surv., 173, 1900, p. 42. Graban and Shimer, N. A. Index Fossils, 1, 1907, 

 p. 152. Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1908, 

 p. 740. Bassler, Bull. U. S. Nat. Mus., 77, 1911, p. 147; Zittel-Eastman 

 Textb. Pal., 1913, p. 342. 



Arthrostylus conjunctus Ulrich. 



Arthrostylus conjunctus Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 

 189, fig. 14; Geol. Minnesota, 3, 1893, p. 188, pi. 3, figs. 13, 14. Simpson, 

 14th Ann. Rep. State Geol. New York for 1894, 1897, p. 526, figs. 78, 79, 79a. 

 Bassler, Bull. U. S. Nat. Mus., 77, 1911, pp. 147, 148, fig. 70; Zittel-Eastman 

 Textb. Pal., 1913, p. 343, fig. 501d, e. 



Black River (Decorah): Near Fountain, Minnesota. 



Ordovician (Wassalem): Uxnorm, Esthonia, Russia. 



Holotype.C&t. No. 43636, U.S.N.M. 



Arthrostylus curtus (Ulrich). 



Arthronema curtum Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, p. 161, pi. 



6, fig. 9. 

 Arthrostylus curtus Miller, N. A. Geol. Pal., ]889, p. 293. Nickles and Bassler, 



Bull. U. S. Geol. Surv., 173, 1900, p. 171. 

 Maysville (Mount Hope): Covington, Kentucky. 

 Holotype.Czt. No. 43639, U.S.N.M. 

 Observation. Probably the basal segment of some species of Arthropora. 



Arthrostylus obliquus Ulrich. 



Arthrostylus obliquus Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 190, 

 figs. 14c, d; Geol. Minnesota, 3, 1893, p. 188, pi. 3, figs. 15, 16. Grabau and 

 Shimer, N. A. Index Fossils, 1, 1907, p. 152, fig. 205i. Bassler, Bull. U. S. 

 Nat. Mus., 77, 1911, p. 148, fig. 71. 



Black River (Decorah): Minneapolis, Minnesota. 



Ordovician (Echinospherites limestone): Wolchow River, St. Petersburg, Russia. 



Holotype.V&t. No. 43639, U.S.N.M. 



Arthrostylus teuuis (James). 



Helopora tenuis James, Paleontologist, No. 1, 1878, p. 3. 



Arthronema tenuis Ulrich, Jour. Cincinnati Soc. Nat. Hist., 5, 1882, p. 160, pi. 

 6, figs. 8-8c. 



Arthrostylus tenuis Ulrich, Geol. Minnesota, 3, 1893, pi. 3, fig. 16e; Jour. Cin- 

 cinnati Soc. Nat. Hist., 12, 1890, pp. 189, 190, figs. 14e, f. Bassler, Proc. 

 U. S. Nat. Mus., 30, 1906, p. 15. Cumings, 32d Ann. Rep. Dep. Geol. Nat. 

 Res. Indiana, 1908, p. 768, pi. 26, figs. 8-8c. 



