986 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Platyceras niagarense (Hall). 



Acroculia niagarensis Hall, Pal. New York, 2, 1852, p. 288, pi. 60, fig. 3. Roemer, 

 Sil. Fauna West. Tennessee, Breslau, 1860, p. 76, pi. 5, fig. 16. 



Platyceras niagarensis Hall, 20th Rep. New York State Cab. Hist., 1868, p. 341; 

 rev. ed., 1870, p. 390. Grabau, Bull. Buffalo Soc. Nat. Sci., 7, 1901, p. 211, 

 fig. 139; Bull. New York State Mus., 45, 1901, p. 211, fig. 139; Amer. Nat., 

 36, 1902, p. 939. Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 680, 

 fig. 954. 



Niagaran: Lockport, Rochester, etc., New York; Ontario (Rochester); West 

 Tennessee (Brownsport) ; etc. 



PLATYCBRAS NIAGARENSE var. CLINTONENSE Foerste. See Diaphorostoma niagarense 

 clintonense. 



PLATYCERAS (PLATYSTOMA) NIAGARENSIS Foerste. See Diaphorostoma niagarense. 



Platyceras proclive Ringueberg. 



Platyceras proclive Ringeberg, Buffalo Soc. Nat. Hist., Bull. 5, 1886, p. 14, 



pl. 2, fig. 2. 



Clinton (Rochester): Lockport, New York. 

 Observation. Apparently a Crania. 



Platyceras pronum Foerste. 



Platyceras pronum Foerste, Bull. Sci. Lab. Denison Univ., 14, 1909, p. 65, pl. 3, 



fig. 40. 

 Clinton (Osgood): Clifton, Tennessee. 



Platyceras senex (Winchell and Marcy). 



Porcellia senex Winchell and Marcy, Mem. Boston Soc. Nat. Hist., 1, 1865, p. Ill, 



pl. 3, fig. 6. 



Platyceras senex Miller, N. A. Geol. Pal., 1889, p. 417 (gen. ref.). 

 Niagaran (Racine): Chicago, Illinois. 



Platyceras tenuiliratum Hall. 



Platyceras tenuiliratum Hall, Pal. New York, 3, 1859, p. 317, pl. 48, figs. 1-5; 

 pl. 49, figs. 6a, b. Maynard, Maryland Geol. Surv., Lower Dev., 1913, 

 p. 476, pl. 85, figs. 1, 2. 



Helderbergian: Albany County, New York (New Scotland); Cash Valley, Mary- 

 land (Keyser). 



Platyceras unguiforme Hall. 



Platyceras unguiforme Hall, Pal. New York, 3, 1859, p. 322, pl. 59, figs. 1-4. 



Nettelroth, Kentucky FOBS. Shells, Geol. Surv. Kentucky, 1889, p. 168. 

 Helderbergian (New Scotland) : Albany and Schoharie Counties, New York. 

 ?Niagaran (Louisville): Louisville, Kentucky (Nettelroth). 

 Plesiotype.C&t. No. 51342, U.S.N.M. (Nettelroth). 



Platyceras vetulum Sardeson. 



Platyceras vetulum Sardeson, Bull. Minnesota Soc. Nat. Sci., 4, 1896, p. 76, pl. 4, 



fig. 1. 

 St. Peter: South St. Paul, Minnesota. 



Platyceras(?) wisconsinense Ulrich and Scofield. 



Platyceras(?) wisconsinensis Ulrich and Scofield, Geol. Minnesota, 3, pt. 2, 1897, 



p. 1068, pl. 61, figs. 49-54. 

 Black River (Platteville) : Beloit, Wisconsin. 

 Cotypes.C&t. No. 45955, U.S.N.M. 



