CEPHALOPODA. 225 
Mr. Worthed described 0. rectum and 0. Unionense, from the Niagara group 
( Geolog. Surv. III., vol. 6). 
In 1876 Mr. Hall published 0. luxum and 0. procerus, from the Schoharie 
grit; 0. molestum, 0. Pelops var. Ohioense and 0. rudicula, from the Upper Ilel- 
derberg limestone; 0. Bebryx and 0. robustum {=0. Eriense, H., 1877), from the 
Hamilton group; and identified 0. typus , Saemann {=0. Marcellense, Vanuxem), 
from the Marcellus shale {Ulus. Devon. Foss.) ;* and 0. simulator, from the Nia¬ 
gara group {Twenty-eighth Rep. N. Y. State Mus. Nat. Hist.). 
In 1877 Mr. Hall proposed the following names for species before published 
by him under preoccupied names: Orthoceras Clintoni .for 0. subarcuatura II., 
1847 ; 0. Olorus for 0. vertebrate II., 1847; 0. sociale for 0. gregarium 11., 1861; 
0. Orus for 0. columnare H., 1860; 0. subcancellatum for 0. cancellatum H., 1852; 
0. desideratum for 0. clavatum 11., 1852; 0. stylus for 0. baculum II., 1862 (S. 
A. Miller’s Catalogue of American Palaeozoic Fossils). 
In 1879 Mr. Hall described Orthoceras Amycus, from the Niagara group at 
Waldron, Indiana {Trans, of the Albany Institute, vol. X). 
Mr. C. D. Walcott described Orthoceras Oneidaense, from the Utica slate of 
New York {Trans, of the Albany Institute, vol. X). 
The following American species of Orthoceras have been identified in Great 
Britain, according to Morris’ Catalogue of British Fossils, 1854: 
Orthoceras arcuoliratum . Hall . Lower Silurian, Broughton. 
0. bilineatum . “ Lower Silurian, Ayrshire. 
0. Brongniarti . . . Troost . Lower Silurian, Tyrone. 
0. laqueatum . . . Hall . Upper Silurian, Westmoreland. 
0. vertebrale “ . Upper Silurian, Presteign. 
* In 1853 Dr. L. Saemann described Orthoceras typus, from the limestone of the Marcellus shale, near 
Cazenovia, N. V. (Dunlcer and Von Meyer: PalcBontograpldca). This species was recognized as identical 
with 0. Marcellense of Vanuxem, in the Thirteenth Report on the /State Cabinet of Natural History, 1860. 
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