784 BULLETIN 02, UNITED STATES NATIONAL MUSEUM. 



MACROSTYLOCRINUS WALDRONENSIS Wachsmuth and Springer. See Dimerocrinus 

 waldronensis. 



MADREPORA INTERSTINCTA Linnaeus. See Heliolites interstinctus. 

 MADREPORA ORGANUM Linnaeus. See Syringophyllum organum. 

 MADREPORITES ARTICULATUS WAHLENBERG. See Cyathophyllum articulatum. 



M^ELONOCERAS Hyatt. Genotype: Phragmoceras praematurum Billings. 



Mselonoceras Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 280. Miller, N. A. 



Geol. Pal., 2d App., 1897, p. 775. Grabau and Shimer, N. A. Index Fossils, 2, 



1910, p. 118. 



Meloceras Foord, Cat. FOBS. Ceph. British Mus., 1, 1888, p. 262, footnote, p. 269. 

 Meloceras (Melonoceras) [subgenus of Oncoceras] Hyatt, Zittel-Eastman Textb. 



Pal., 1900, p. 530; 2d ed., 1913, p. 611. 



Maelonoceras arcticameratum (Hall). 



Cyrtoceras arcticameratum Hall, Pal. New York, 2, 1852, p. 349, pi. 84, figs. 7a-d. 



Whiteaves, Pal. Foss., Geol. Surv. Canada, 3, pt. 2, 1895, p. 103. Clarke and 



Ruedemann, Mem. New York State Mus., 5, 1903, p. 87, pi. 15, figs. 1, 2; pi. 



16, figs. 1-7. 

 Cyrtoceras (Meloceras) arcticameratum Foord, Cat. Foss. Ceph. British Mus., 1, 



1888, p. 288. 

 Maelonoceras arcticameratum Grabau and Shimer, N. A. Index Fossils, 2, 3910, p. 



119, fig. 1356. 

 Niagaran (Guelph): Gait, Ontario; Rochester, New York; Cedarburg, Wisconsin. 



Maelonoceras falx (Billings). 



Cyrtoceras falx Billings, Geol. Surv. Canada, Rep. Progr. for 1853-1856, 1857, p. 



314. Salter, Geol. Surv. Canada, dec. 1, 1859, p. 32, pi. 7, fig. 1-4. 

 Cyrtoceras (Meloceras) falx Foord, Cat. Foss. Ceph. British Mus., 1, 1888, p. 270. 

 Black River (Leray): Pauquettes Rapids, Ottawa River, Canada. 



Maelonoceras metellus (Billings). 



Cyrtoceras Metellus Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 191, fig. 



175. 

 Maelonoceras metellus Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 280 (gen. 



ref.). 

 Canadian (Levis-Limestone): Point Levis, Quebec. 



Mselonoceras neleus (Hall). 



Cyrtoceras neleus Hall, Rep. Supt. Geol. Surv. Wisconsin, 1861, p. 40. Whitfield, 

 Mem. Amer. Mus. Nat. Hist., 1, pt. 2, 1895, p. 65, pi. 9, figs. 10, 11. Clarke 

 Geol. Minnesota, 3, pt. 2, 1897, p. 804, pi. 59, figs. 17-20. 



Maelonoceras neleus Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 118, fig. 

 1355. 



Black River (Platteville): Beloit, Wisconsin; Cannon Falls, etc., Minnesota. 



Trenton (Prosser): Wykoff, Minnesota. 



Maelonoceras prramaturum (Billings). 



Phragmoceras prsematurum Billings, Canadian Nat. Geol., 5, 1860, p. 173, figs. 



19, 20. Chapman, Canadian Jour., n. s., 8, 1863, p. 22, fig. 133; p. 198, fig. 



175; Expos. Min. Geol. Canada, 1864, p. 130, fig. 133; p. 170, fig. 175. 

 Maelonoceras prsematurum Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 280 



(gen. ref.). 

 Black River: Le Cloche Island, Lake Huron; La Petite Chaudiere Rapids and 



Pauquette's Rapids, Ottawa River, Canada (Leray). 



