CEPHALOPODA. 219 



Mr. L. Vanuxem described Orthoceras primigenium, from the Calciferous group ; 

 the " Marcellus Orthocera" [=0. Marcellensis], from the Marcellus shale; and 

 O. constriction, 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; Actinoceras 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 Actinoceras 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 Systime 

 Silurien de V Ami rique). 



Mr. Conrad described Orthoceras anellum, from the Black-river and Trenton 

 limestones (Jour. Acad. Nat. Sci. Phila.). 



James Hall described Orthoceras leave [=0. sublceve, d'Orbigny, 1850], from 

 the Onondaga Salt group ; 0. subulatum, from the Marcellus shale ; and 0. aci- 

 cula [=Coleotus 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; O. moniliforme, 0. subarcualum (=0. Clintoni, Hall, 1877), 

 and 0. lenuiseptum, from the Chazy limestone; 0. rectiannulatum, from the Cliazy 

 and Birdseye ; O. recticameratum, from the Birdseye limestone ; 0. arcuoliratum 

 and O. 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, O. strigatum, 0. teretiforme, O. textile, 0. vertebrate (= 0. Olorus, H., 1877), 

 0. bilineatum var. a, 0. clathralum, O. undulostriatum, and O. junceum, from the 

 Trenton limestone ; and O. lamellosum, from the Hudson-river group ; also the 

 following species of Ormoceras: Ormoceras (?) gracile, 0. tenuifilum and 0. tenui- 

 filum var. distans, from the Black-river limestone ; and 0. crebriseptum, from the 



