4 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



ACER VU LABI A Continued. 



(Arch. Mus. Hist. Nat., 5, 1851), pp. 171, 414. Pictet, Traite de Pal., 2d ed., 

 4, 1857, p. 457. Hall, Geol. Surv. Iowa, 1, pt. 2, 1858, p. 476. Milne-Ed- 

 wards, Hist. Nat. d. Corall., 3, 1860, p. 407. Dybowski, Archiv. f. Natur. 

 Liv.-Ehst. und Kurl., 5, 1873, p. 338. Zittel, Handbuch Pal., 1, 1879, p. 233. 

 Roemer, Leth. geog., pt. 1, Leth Pal., 1883, p. 350. Koch, Pakeontographica, 

 29, 1883, pp. 330, 342. Miller, N. A. Geol. Pal., 1889, p. 170. Sherzer, 

 Amer. Geol., 7, 1891, pp. 284-289. Koken, Die Leitfossilien, Leipzig, 1896, 

 p. 311, fig. 234. Lindsfcrom, Kongl. Sven. Vet.-Akad. Handl., 32, No. 1, 

 1899, p. 17. Zittel-Eastman Textb. Pal., 1, 1900, p. 79. Lambe, Cont. Can. 

 Pal., Geol. Surv. Canada, 4, pt. 2, 1901, p. 163. 



Acervularia austini (Salter). 



Strephodes? Austini Salter. Sutherland's Jour. Voyage in Baffins Bay, etc., 2, 



1852, p. ccxxx, pi. 6, figs. 6, 6a. Etheridge, Quart. Jour. Geol. Soc. 



London, 1878, p. 587. Woodward, Geol. Mag., dec. 2, 5, 1878, p. 386, pi. 10, 



figs. 1, 2. 

 Clisiophyllum austini? Houghton, Jour. Geo. Soc. Dublin, 1, 1857, p. 246, pi. 10, 



figs. 2, 2a. 

 Acervularia austini Lambe, The Cruise of the "Neptune," App. 4, 1906, p. 322; 



Cruise of the " Arctic" in 1908-9, 1910, p. 479. 

 Niagaran: Cornwallis, Beechey and Griffith's Islands, and Cape Hilgard, Arctic 



America. 



Acervularia clintonensis Nicholson. 



Acervularia clintonensis Nicholson, Geol. Surv. Ohio, Pal. 2, 1875, p. 227, pi. 



23, figs. 2, 2a. Miller, N. A. Geol. Pal., 1889, p. 170, fig. 129. 

 Upper Medinan (Brassfield?): Yellow Springs, Ohio. 



ACERVULARIA COMMUNIS Simpson. See Prismatophyllum inequalis. 



Acervularia gracilis (Billings). 



Strombodes gracilis Billings, Geol. Canada, Geol. Surv. Canada, 1863, p. 306, 



fig. 309; Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 113 (Adv. sheets, 1862). 



Chamberlin, Geol. Wisconsin, 1, 1883, p. 190, fig. Lesley, Geol. Surv. 



Pennsylvania, .Rep. P. 4, 1890, p. 1109, fig. 

 Acervularia gracilis Lambe, Ottawa Nat., 12, 1899, p. 221; Cont. Can. Pal., Geol. 



Surv. Canada, 4, pt. 2, 1901, p. 163, pi. 14, figs. 2, 2a. 

 Upper Medinan (Cataract): Manitouaning, Grand Manitoulin Island, Lake Huron. 



ACERVULARIA INEQUALIS Sehuchert. See Prismatophyllum inequale. 



ACHRADOCRINUS Schultze. Genotype: A. ventrosus Schultze. 



Achradocrinus Schultze, Denk. d. Kais. Akad. der Wiss., Math.-Naturw. Cl. 24, 

 Abth. 2, p. 213, fig. 19. Zittel, Handb. Pal., 1, 1879, p. 364. Wachsmuth and 

 Springer, Proc. Acad. Nat. Sci. Philadelphia, 1886, pp. 115, 151. (Rev. Pal., 

 pt. 3, sec. 2, pp. 191, 272.) Bather, Ann. Mag. Nat. Hist., 6 ser., 5, 1890, p. 

 324, pi. 14, fig. 22; Treatise on Zool., pt. 3, Echinoderma, 1900, p. 178, fig. 95. 

 Slocom, Field Columbian Mus., 2, 1908, p. 287. Zittel, Handb. Pal., 1, 1910, 

 p. 152. 



Achradocrinus patulus Slocom. 



Achradocrinus patulus Slocom, Field Columbian Mus., 2, 1908, p. 288, pi. 85, 



figs. 1-4. 

 Niagaran (Racine): Romeo, Illinois. 



