808 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Michelinia louisvillerisis Greene. 



Michelinia louisvillensis Greene, Cont. Indiana Pal., pt. 3, 1899, p. 20, pi. 8, figs. 



10-12. 

 Niagaran (Louisville): Near Louisville, Kentucky. 



Michelinia niagarensis Davis. 



Michelinia niagarensis Davis, Kentucky Foss. Corals, Geol. Surv. Kentucky, 



pt. 2, 1885, pi. 39, fig. 2. 

 Niagaran (Louisville): Near Louisville, Kentucky. 



Michelinia prima Davis. 



Michelinia prima Davis, Kentucky Foss. Corals, Geol. Surv. Kentucky, pt. 2, 



1885, pi. 39, figs. 3-5; pi. 40, fig. 1. 

 Niagaran (Louisville): Louisville, Kentucky. 



MICROCERAS Hall. Genotype: M. inoruatum Hall. 



Microceras Hall, Amer. Jour. Sci., 48, 1845, p. 249. Meek, Geol. Surv. Ohio, 



Pal. 1, 1873, p. 148. Miller, Cincinnati Quart. Jour. Sci., 1, 1874, p. 



311. Koninck, Ann. Mus. Royal d'Hist. Nat. de Belgique, 8, 1883, p. 123, 



footnote. Miller, N. A. Geol. Pal., 1889, p. 410. Ulrich and Scofield, Geol. 



Minnesota, 3, pt. 2, 1897, p. 847. Cumings, 32d Ann. Rep. Dep. Geol. Nat. 



Res., Indiana, 1908, p. 951. 

 Discolites Emmons, Amer. Geology, 1, pt. 2, 1855, p. 234 (Genotype: D. ininutus 



Emmons). 



Microceras inornatum Hall. 



Microceras inornatus Hall, Amer. Jour. Sci. Arts, 48, 1845, p. 294. Miller, Cin- 

 cinnati Quart. Jour. Sci., 1, 1874, p. 312. Cumings, 32d Ann. Rep. Dep. 

 Geol. Nat. Res. Indiana, 1908, p. 970, pi. 40, figs. 9, 9a. 



Cyrtolites (Microceras) inornatus Meek, Geol. Surv. Ohio, Pal. 1, 1873, p. 147, 

 pi. 13, figs. 4a, b. 



Cyrtolites subcompressus Meek, Geol. Surv. Ohio, Pal. 1, 1873, p. 147 (under 

 C. inornatus). 



Discolites minutus Emmons, Amer. Geology, 1, pt. 2, 1855, p. 234. 



Maysville and Richmond: Cincinnati, Ohio, and vicinity; Indiana; Kentucky; 

 Tennessee; etc. 



Microceras minutissimum Ulrich. 



Microceras minutissimum Ulrich, Jour. Cin. Soc. Nat. Hist., 2, 1879, p. 13,' pi. 7, 



fig- 8. 



Maysville (Fairmount): Hamilton, and Cincinnati, Ohio. 

 Cotypes.^i. No. 46048, U.S.N.M. 



MICRODISCUS Emmons. See Ampyx Dalman. 

 MICROPORA Eichwald. See Stictoporella Ulrich. 

 MICROSPONGIA Miller and Dyer. See Hindia Duncan. 

 MILLEPORA REPENS Fought. See Alveolites repens. 

 MILLERIA Davis. See Dictyostroma Nicholson. 



MIMULUS Barrande. Genotype: M. perversus Barrande. 



Mimulus Barrande, Syst. Sil. du Centre Boheme, 5, pt. 1, 1879, p. 109, pi. 9 

 (Ext. ibid., p. 173). Zittel, Handb. Pal., 1, p. 684. Hall and Clarke, Pal. 

 New York, 8, pt. 1, 1892, p. 272; llth Ann. Rep. New York State Geol., 

 1894, p. 289. Schuchert, Zittel-Eastman Textb. Pal., 1, 1900, p. 315; ibid., 

 2d ed., 1913, p. 388. 



