70 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Arthroclema billingsi Uh-ich. 



Arthroclema billingsi Ulrich, Geol. Siirv. Illinois, 8, 1890, p. 642; Geol. Minnesota, 

 3, 1893, p. 197, pi. 2, fig. 7.— Simpson, 14th Ann. Rep. State Geol. New York 

 for 1894, 1897, p. 547, fig. 105.— Grabau and Shimer, N. A. Index Fossils, 1, 

 1907, p. 153, fig. 205k.— Bassler, Zittel-Eastman Textb. Pal., 1913, p. 343, 

 fig. 501a. 



Trenton: Ottawa, Ontario. 



Holotype.—Qat. No. 43415, U.S.N.M. 



Arthroclema cornutum Ulrirh. 



Arthroclema cornutum Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, p. 193, 

 fig. 18; Geol. Minnesota, 3, 1893, p. 200, pi. 2, figs. 16-21, 23, pi. 3, fig. 34.— 

 Simpson, 14th Ann. Rep. State Geol. New York for 1894, 1897, p. 547, figs. 

 106-108, 112. 



Black River (Decorah): Minneapolis, Minnesota. 



Coty pes. —Ca.t. No. 43634, U.S.N.M. 



Arthroclema piilchellum Billings. 



Arthroclema pukhellum Billings, Pal. Foss., 1, 1865, p. 54, fig. 60 (adv. sheets, 



1862); Geol. Canada, Geol. Surv. Canada, 1863, p. 157, fig. 119.— Ulrich, 



Geol. Surv. Illinois, 8, 1890, p. 642, pi. 29, fig. 6c; Geol. Minnesota, 3, 1893, 



pi. 2, figs. 12-15. 

 Arthroclema armatum (part) Ulrich, Jour. Cincinnati Soc. Nat. Hist., 12, 1890, 



p. 194, fig. 19e-h (not 19a-d). 

 Trenton: Ottawa, Ontario. 



Arthroclema spiniforme Ulrich. See Helopora spiniformis. 



Arthroclema ntriatum Ulrich. 



Arthroclema striatum Ulrich, Geol. Minnesota, 3, 1893, p. 198, pi. 2, figs. 22, 24, 



pi. 3, figs. 28-33.— Simpson, Hth Ann. Rep. State Cieol. New York for 1894, 



1897, p. 547, figs. 109, 110. 

 Black River (Decorah): Mmneapolis and St. Paul, Minnesota, 

 Cotypes.—C&t. No. 43498, U.S.N.M. 



Arthronema Ulrich. See Arthrostylus Ulrich. 



ARTHROPHYCUS Hall. Genotype: Fucoides harlani Conrad . 



Arthrophycus Hall, Pal., New York, 2, 1852, p. 4.— Dawson, Canadian Nat. 

 and Geol., n. s., 1, 1864, p. 366.— Nathorst, Kongl. Sven. Vet.-Akad. Handl., 

 18, No. 7, 1881, pp. 32, 86.— James, Jour. Cincinnati Soc. Nat. Hist., 16, 1893, 

 p. 82; Proc. Amer. Assoc. Adv. Sci., 42, 1894, p. 172.— Grabau, Bull. Buffalo 

 Soc. Nat. Sci., 7, 1901, p. 132; Bull. New York State Mus., 9, 1901, p. 132.— 

 Sarle, Proc. Rochester Acad. Sci., 4, 1906, p. 203.— Grabau and Shimer, N. A. 

 Index Fossils, 2, 1910, p. 247. 



Harlania Goeppert, Zeits. d. d. Geol. Gesell., 3, 1851, p. 189.— Roemer. Leth. 

 geog., 1 Theil, Leth. Pal., Erste Lief, 1880, p. 135.— Nathorst, Kongl. Sven. 

 Vet.-Akad. Handl., 21, No. 14, 1886, p. 32. 



Arthrophycus alleghaniensis (Harlan). 



Fucoides alleghaniensis Harlan, Jour. Acad. Nat. Sci., 6, 1831, p. 289, pi. 15.— 

 Taylor Trans. Geol. Soc. Pennsylvania, 1, 1834, p. 5.— Harlan, Medical and 

 Physical Researches, 1835, p. 393, fig. 1 on plate.— Unger, Gen. et Sp. Foss. 

 Plants, 1850, p. 30. 



Arthrophycus alleghaniensis James, Jour. Cincinnati Soc. Nat. Hist., 16, 1893, 

 p. 86.— Proc. Amer. Assoc. Adv. Sci., 42, 1894, p. 172.— Sarle, Proc. Roches- 

 ter Acad. Sci., 4, 1906, p. 203.— Bassler, Bull. Geol. Surv. Virginia, 2a, 1909, 

 pi. 8, fig. 4.— Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 247. 



