784 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Macrostylocrinus waldronensis Wachsmuth and Springer. See Dimerocrinus 

 waldronensis. 



Madrepora interstincta Linnaeus. See Heliolites interstinctus. 



Madrepora organum Linnaeus. See Syringophylluni organum. 



Madreporites artioulatus Wahlenberg. See Cyathophyllum articulatum. 



MiELONOCERAS Hyatt. Genotype: Phragrnoceras praematurum Billings. 



Maelonoceras 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. Foss. Ceph. British Mus., 1, 1888, p. 262, footnote, p. 209. 

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



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



Maelonoceras arcticanieratum (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, 1910, p. 



119, fig. 1356. 

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



Mselonoceras 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. 



Mselonoceras metellus (Billings). 



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



175. 

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



ref.). 

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



Maelonoceras 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 praematuruin (Billings). 



Phragmoceras praematurum 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 praematuruin 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). 



