CEPHALOPODA. 
223 
Prof. Swallow described 0. Chesterense, from the St. Genevieve group == Car¬ 
boniferous {Trans. St. Louis Acad. Sci.). 
Prof. Winchell described 0. heterocinctum and 0. Whitei, from the Kinder- 
book group = Waverly group ( Proc. Acad. Nat. Sci. Phila.). 
In 1865 Mr. Billings described 0. Atticus, 0. Catalina, 0. Cato, 0. Catullus, 
0. explorator, 0. Flavius, 0. hcesitans, 0. Missisquoi, 0. Perseus, 0. piscator, 0. 
Priamus, 0. repens, 0. Sayi, 0. servile, 0. Tityrus and 0. Xerxes, from the Quebec 
group; 0. dijfidens, 0. Drummondi and 0. velox, from the Chazy group; 0. edax, 
O. furtivum, 0. Gla-ucus, 0. indagator, 0. ordinatum and 0. veterator, from the Cal- 
ciferous group {Palaeozoic Fossils). 
Meek and Worthen described 0. crebristriatum and 0. Jolietense, from the 
Niagara group {Proc. Acad. Nat. Sci. Phila.). 
In 1866 Mr. Billings described 0. bcllatulum, O. infelix and 0. Medon, from 
the Clinton group; 0. Brontes, 0. Cadmus, 0. Oberon, O. Pylades, O. Remus and 
0. Varro, from the Niagara group; 0. Crocus and 0. fulger, from the Hudson- 
river group; 0. ferum and 0. Sieboldi, from the Hudson-river and Anticosti 
groups; and 0. pileolum and 0. raptor, from the Medina group {Catalogue Silur. 
Foss. Anticosti). 
Prof H. B. Geinitz described 0. cribrosum, from the coal measures {Carb. und 
Dyas in Nebraska). 
Mr. H. A. Worthen published 0. subaculum (not defined), from the Niagara 
group {Geolog. Surv. Illinois, vol. 1). 
Messrs. Meek and Worthen described 0. Winclielli, from the Devonian {Proc. 
Acad. Nat. Sci. Phila.). 
Mr. Winchell described 0. pustulosum, from the Hamilton group {Rep. Lower 
Penin. Mich). 
M. J. Barrande described Or thorn'as {Endoceras) Rottermundi, from the Trenton 
limestone; and Huronia distincta {=Huronia sp. ? Stokes, 1840), from the Nia¬ 
gara limestone {Syst. Silur. du centre de la Boheme). 
Mr. Hall described 0. abnorme, 0. alienum , 0. crebescens, 0. Niagarense, and 
recognized 0. angulatum, of Wahl., from the Niagara group; also 0. Loxias, 
from Lower Silurian {Twentieth Rep. N. Y. State Cab. Nat. Hist.). 
