$56 PALMONTOLOQY 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 (Paleon- 

 tology of New York, vol. 3). 



In 1860 Messrs. F. B. Meek and H. A. Worthen described C. curtum and C. 

 dilatalum, 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. McChesnev described C. giganteum [= Nautilus cancellatus, McC, 

 1801], from the Niagara group (New Paleozoic 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 Hudson-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. meiula and C. morsum, from the Upper 

 Helderberg group ; and C. liratum, from the Hamilton group (Fifteenth Rep. N 

 Y. State Cab. Nat. Hist.). 



Mr. Bi i.i.i nos described C. Lysander, from the Hudson-river group, and C. 

 Orodes, from the Guelph group (Paleozoic Fossils, vol. 1). 



.Mr. A. Winchell described C. unicorne, from the Chemung group (Proc. Acad. 

 Nal. Sci. Phila.). 



In 1865 Mr. Billings described C. Alelhes, C. Aristides, C. Dictys, C. Melellus, 

 C. Missisquoi and C. Syphax, from the Quebec group ; C. Huronense 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 (Paleozoic Fossils, vol. 1). 



Messrs. A. Winchell and 0. Marct described Lituites Hercules, from the 



