CEPHALOPODA. 
219 
Mr. L. Vanuxem described Orthoceras primigeniurri, from the Calciferous group ; 
the “ Marcellus Orthocera” [=0. Marcellensis], from the Marcellus shale; and 
0. constrictum, from the Hamilton group (Geol. Surv. of N. Y., Third Dist.). 
In 1843 M. F. de Castelnau described and illustrated the following as new 
species: Orthoceras Hercules, 0. conicum, and 0. filiformis, from Drummond 
Island, Lake Huron; Adinoceras Blainvillei, and A. Cordieri, from Manitouline 
Island, Lake Huron; A. Beaudanti, A. Beaumonti, and A. Dufresnoyi, from Drum¬ 
mond Island; A. Deshayesi, Green Bay; Huronia obliqua, from Drummond 
Island; and H. Stokesi, from the “ Calcaires schisteux de Schoharie.” He also 
described and illustrated Adinoceras Richardsoni (?) Stokes, from Manitouline 
Island, Lake Huron; and A. Lyoni, Stokes, from Lac des Bois. 
He also described two new genera, Sidemina and Nelimenia, which he places 
under the Cephalopoda, and the species, S. infundibiliformis, from Manitouline 
Island, and N. incognita, from the Falls of Montmorensi ( Essai sur le Systeme 
Silurien de V Amirique). 
Mr. Conrad described Orthoceras anellum, from the Black-river and Trenton 
limestones (Jour. Acad. Nat. Sci. Bhilai). 
James Hall described Orthoceras lave [=0. sublave, d’Orbigny, 1850], from 
the Onondaga Salt group; 0. subulatum, from the Marcellus shale; and 0. aci- 
cula [=Coleolus acicula ], from the Portage group (Geol. Surv. of N. Y., Fourth 
District). 
In 1847 Mr. Hall described Orthoceras laqueatum, from the Calciferous and 
Trenton limestone; 0. moniliforme, 0. subarcuatum (=0. Clintoni, Hall, 1877), 
and 0. tenuiseptum, from the Chazy limestone; 0. rectiannulatum, from the Chazy 
and Birdseye; 0 . recticameratum, from the Birdseye limestone; 0 . arcuoliratum 
and 0. fusiforme, from the Black river and Trenton limestones; 0. coralliferum, 
from the Utica slate and Hudson-river group; 0. bilineatum, from the Chazy, 
Black-river, Trenton and Hudson-river groups; 0. laqueatum var. a, 0. latian- 
nulatum, 0. strigatum, 0. teretiforme, O. textile, 0. vertebrate (=0. Olorus, II., 1877), 
0 . bilineatum var. a, 0 . clathratum, 0 . undulostriatum, and 0 . junceum , from the 
Trenton limestone; and 0. lamellosum, from the Hudson-river group; also the 
following species of Ormoceras : Ormoceras (?) gracile, 0. tenuifdum and 0. tenui- 
filum var. distans, from the Black-river limestone; and 0. crebriseptum, from the 
