CEPHALOPODA. 357 
Niagara group (Mem. Bost. Soc. Nat. Hist., vol. 1). [Referred to Cijrtoceras: S. 
A. Miller, Catalogue of Palaeozoic Fossils, 1877.] 
Mr. Winch ell described C. Pockfor dense, from the Kinderhook group ( Proc. 
Acad. Nat. Sci. Phila.). 
In 1866 Mr. Billings described C. Clitus, C. Corydon and C. fragile, from the 
Anticosti and Niagara groups (Cat. Silur. Foss. Anticosti). 
Messrs. Meek and Worthen described C. sacculus \= Gomphoceras sacculum ], 
from the Hamilton group (Proc. Acad. Nat. Set. Phila.). 
In 1867 J. Hall described C. amplicorne, C. brevicorne, C. laterale, C. Lucillus, 
C. pusillum and C. rigidum, from the Niagara group of Wisconsin (Twentieth Rep. 
N. Y. State Cab. Nat. Hist.). 
In 1869 Mr. J. M. Safford described C. Bondi and C. Massiense, from the 
Nashville group, and C. Stoncnse, from the Trenton group (Geology of Tennessee). 
M. J. Barrande described C. surgens, from the Quebec group of Canada (Syst. 
Silur. du centre de la Boheme). 
In 1871 Mr. Meek described C. Ohioense, from the Corniferous group (Proc. 
Acad. Nat. Sci. Phila.). 
In 1874 Mr. S. A. Miller described C. Vallandighami, from the Hudson-river 
group (Cin. Quart. Journ. Sci.). 
In 1875 Mr. Worthen described C. Carrollense, from the Galena group (Geolog. 
Surv. of Illinois, vol. 6). 
Messrs. Hall and Whitfield described C. Hertzeri and C. Myric.e, from the 
Niagara group of Ohio (Geolog. Surv. of Ohio: Pal., vol. 2). 
Mr. Billings described C. Ligarius, from the Hudson-river group (Palaeozoic 
Fossils, vol. 2). 
Mr. S. A. Miller described C. magister and C. ventricosum, from the Hudson- 
river group (Cin. Quart. Journ. Sci., vol. 2). 
In 1876 J. Hall illustrated C. absens [=Gomphoceras absens\, C. clavatum 
[= Gomphoceras clavatum ] and C. Orion \=Trochoceras Orion\, from the Upper 
Helderberg group; C. undulatum [= C. alternatum\ and C. gibbosum [= Gompho¬ 
ceras oviforme], from the Hamilton group (Ildus. Devon. Fossils). 
Mr. C. A. White described C. dictyum, from the Devonian system (Proc. 
Acad. Nat. Sci. Phila.). 
