1911] Teller, Fossils from the Palwosoic Formations. 249 



Orthoceras medullare Hall. Niagara (Sil.) 



Geol. Surv. Wis., Eept. of Prog., Hall, 1860, p. 4. 

 Twentieth Ann. Eept. N. Y. State Cab. of Nat, Hist., Hall, 1867, 

 p. 353, pi. 20 (11.), figs. 1, 2. 



Obs. 0. scammoni, McChesney is probably identical 

 with, this species. 



Locality — Waukesha, Wis. 

 Type — Am. Mus. of Nat. Hist. 



Orthoceras niagarense Hall. Niagara (Sil.) 



Twentieth Ann. Eept. N. Y. State Cab. of Nat. Hist., Hall, 1867, 

 p. 356, pi. 20 (11.), fig. 3. 



Locality — Waukesha, Wis. 

 Type— Am. Mus. of Nat. Hist. 



Orthoceras orus (Hall.) Niagara (Sil.) 



Orthoceras columnare, Geol. of Wis., Eept. of Prog., Hall, 1S60, 



p. 4. 

 Orthoceras, columnare, Eighteenth Ann. Eept. N. Y. State Cab. 



of Nat. Hist., Hall, 1864, p. 351, pi. 19 (10.). figs. 4, 6. 8. 

 Orthoceras orus, Am. Pal. Fossils, Miller, 1S77. p. 245. 



Locality — Eacine, Wis. 



Types — Am. Mus. of Nat. Hist. 



Orthoceras planoconvexum Hall. Trenton (Ord.) 



Geol. of Wis., Eept. of Prog., Hall. 1861, p. 47. 

 Geol. of Wis., Whitfield, 1882, Vol. 4, p. 228, pi. 7. fig. 14. 

 Mem. Am. Mus. of Nat. Hist., Whitfield 1895, Vol. 1. Pt. 2, p. 72, 

 pi. 8, figs. 24, 25 and pi. 9, figs. 1, 2. 



Locality — Eeloit and Mineral Point, Wis. 

 Types — Am. Mus. of Nat. Hist. 



•Orthoceras socialis (Hall.) Lorraine (Ord.) 



Orthoceras gregarium, Geol. Surv. Wis.. Eept, of Prog.. Hall. 



1861, p. 46. 

 Orthoceras socialis,. Am. Pal. Fossils, Miller, 1877. p. 245. 



Locality- — ? 



Types — Am. Mus. of Nat, Hist. 



