6 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Acidaspis perarmata Whiteaves. 



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 Shimer, N. A. Index Fossils, 2, 1910, p. 311, fig. 



1621h. 

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



Arkansas (Niagaran-St. Clair). 



ACIDASPIS RHYNCOCEPHALUS Meek. See Ceratocephala cincinnatiensis. 



ACIDASPIS SPINIGER Hall. See Bathyurus spiniger. 



ACIDASPIS TRENTONENSIS Hall. See Odontopleura trentonensis. 



Acidaspis vanhornei Weller. 



Acidaspis vanhornei Weller, Bull. Chicago Acad. Sci., 4, pt. 2, 3907, p. 251, pi. 23, 



figs. 3, 4. 

 Xiagaran (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, llth 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 Shimer, 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 levisensis 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 Shimer, 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. 



