356 
PALEONTOLOGY OF NEW YORK. 
In 1859 Mr. J. W. Salter described C. Billingsi, from the Chazy and Black- 
river groups ( Canadian Organic Remains , Decade 1). 
Mr. Billings described C. Maccoyi, from the Chazy group ( Canadian Naturalist 
and Geologist, vol. 4). 
J. Hall described C. subrectum, from the Lower Helderberg group {Palaeon¬ 
tology of New York, vol. 3). 
In 1860 Messrs. F. B. Meek and H. A. Worthen described C« curium and C. 
dilatatum, from the upper Coal Measures ( Proc. Acad. Nat. Sci. Phila.). 
Mr. Billings described C. exiguum, from the Trenton group ( Canadian Natu¬ 
ralist and Geologist, vol. 5). 
Mr. J. H. McCiiesney described C. giganteum [—Nautilus cancellatus, McC., 
1861], from the Niagara group (New Palaeozoic Fossils). 
In 1861 J. Hall described C. eugium and C. Neleus, from the Chazy and 
Black-river groups; C. loculosum, from the Niagara group; C. Whitneyi, from 
the Iludson-river group; and C. Dardanus, C. Fosteri and C. Orcas (subsequently 
referred to Oncoceras = Cyrtoceras?), from the Niagara group of Wisconsin 
( Geolog. Survey of Wisconsin: Report of Progress). 
In 1862 J. Hall described C. corniculum (not C. corniculum, Barrande, 1848) 
[=C. tenuistriatum, Hall, 1877], from the Trenton group (Rep. Geolog. Surv. of 
Wis., vol. 1); C. eugenium, C. Jason, C. metula and C. morsum, from the' Upper 
Helderberg group; and C. liratum, from the Hamilton group (Fifteenth Rep. N. 
Y. State Cab. Nat. Hist.). 
Mr. Billings described C. Lysander, from the Hudson-river group, and C. 
Orodes, from the Guelph group (Palaeozoic Fossils, vol. 1). 
Mr. A. Winciiell described C. unicorne, from the Chemung group (Proc. Acad. 
Nat. Sci. Phila.). 
In 1865 Mr. Billings described C. Alethes, C. Aristides, C. Dictys, C. Metellus, 
C. Missisquoi and C. Syphax, from the Quebec group; C. IJuronense and C. Isidorus, 
from the Black-river and Trenton groups ; C. Juvenalis, from the Trenton group; 
C. Orestes, from the Niagara group; and C. Postumius, from the Hudson-river 
group (Palaeozoic Fossils, vol. 1). 
Messrs. A. Winchell and 0. Marcy described Lituites Hercules, from the 
