6 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Acidaspis perarmata ^Miiteaves. 



Acidaspis perarmata Whiteaves, Canadian Rec. Sci., 4, 1891, p. 300, pi. 3, fig. 6; 



Geol. Surv. Canada, Pal. Foss., 3, pt. 4, 1906, p. 289, pi. 42, fig. 3. 

 Niagaran: Long Point, Lake Winnipegosis, Saskatchewan, Canada. 



Acidaspis quinquespinosa Lake. 



Acidaspis quinquespinosa Lake, Quart. Jour. Geol. Soc. London, 52, 1896, p. 240, 



pi. 7, figs. 3, 4.— Van Ingen, School of Mines Quart., 23, 1901, p. 50, fig. 12, 



pi., figs. 7, 8.— Grabau and Shimor, N. A. Index Fossils, 2, 1910, p. 311, fig. 



1621h. 

 Silurian: Dudley, England (Wenlock); St. Clair Spring, Independence County, 



Arkansas (Niagaran-St. Clair). 



Acidaspis rhyncocrphalus Meek. See Ceratocephala cincinnatiensia. 



Acidaspis spiniger Hall. See Bathyurus spiniger. 



Acidaspis trentonensis Hall. See Odontopleura trentonensis. 



Acidaspis vanhornel Weller. 



Acida.spis vanhornei Weller, Bull. Chicago Acad. Sci., 4, pt. 2, 1907, p. 251, pi. 23, 



figs. 3, 4. 

 Niagaran (Racine) : Bridgeport, Illinois. 



AcLEiSTOCERAS Hyatt. See Poterioceras McCoy. 



Acroculia Phillips. See Platyceras Conrad. 



ACROTHELE Linnarsson. Genotype: A. coriacea Linnarsson. 



Acrothele Linnarsson, Bihang till K. svensk. Vet.-Akad. Handl., 3, No. 12, 1876, 

 pp. 20-21.— Zittel, Handbuch d. Pal., 1, Abth. 1, 1880, p. 665.— Davidson, 

 British Foss. Brach., 5, pt. 2, 1883, pp. 213-214.— Walcott, Bull. U. S. Geol. 

 Surv., 30, 1886, pp. 107-108.— (Ehlert, Man. Conch., 1887, p. 1269.— Hall and 

 Clarke, 11th Ann. Rep. State Geol. New York, 1892, pp. 249, 250; 45th Ann. 

 Rep. New York State Mus., 1892, pp. 565, 566; Pal. New York, 8, pt. 1, 1892, 

 pp. 98-101.— Schuchert, Zittel-Eastman Textb. Pal., 1, 1900, p. 308.— Mat- 

 thew, Geol. Surv. Canada, Rep. Cam. Rocks Cape Breton, 1903, pp. 103-105. — 

 Grabau and Shinier, N. A. Index Foss., 1, 1907, p. 200.— Walcott, Smiths. 

 Misc. Coll., 53, 1908, pp. 142 and 146; Mon. U. S. Geol. Surv., 51, 1912, p. 630. 



Acrothele levisensls Walcott. 



Acrothele levisensis Walcott, Smithsonian Misc. Coll., 53, No. 3, 1908, p. 85, pi. 8, 



fig. 13; Mon. U. S. Geol. Surv., 51, 1912, p. 646, pi. 81, figs. 12, 12a, b. 

 Canadian (Levis, Didymograptus zone): Point Levis, Quebec. 



Acrothele pretiosa (Billings). 



Obolella pretiosa Billings, Pal. Foss., 1, 1862, p. 68, fig. 61; Geol. Canada, 1863, 



p. 230, fig. 239.— Chapman, Canadian Jour., n. s., 8, 1864, p. 191, fig. 160c.; 



Expos. Min. Geol. Canada, 1864, p. 163, fig. 160b.— Walcott, Bull. U. S. Geol. 



Surv., 30, 1886, p. 111. 

 Billingsia pretiosa Ford, Amer. Jour. Sci., 3d ser., 31, 1886, p. 467 (gen. ref.). 

 Elkania pretiosa Ford, Amer. Jour. Sci., 3d ser., 32, 1886, p. 325 (gen. ref.). 

 Linnarssonia pretiosa Schuchert (part) Bull. U. S. Geol. Surv., 87, 1897, p. 262. — 



Walcott, Proc. U. S. Nat. Mus., 23, 1901. p. 673.— Grabau and Shinier, Index 



Fossils, 1, 1907, p. 200. 

 Acrothele pretiosa Walcott, Proc. U. S. Nat. Mus., 21, 1898, p. 402; Mon. U. S. 



Geol. Surv., 51, 1912, p. 652, pi. 58, figs. 1, la-g. 



