Maryland Geological Survey 487 



way formation and locally in the \ipper part of the Keyser member of the 

 Helderberg. 



Length 5.6 mm.; diameter .7 mm. 



Occurrence. — Helderberg Formation, Keyser Mejibek. Keyser, 

 West Virginia ; Dawson, Devil's Backbone, Tonoloway, Maryland. 



Collection. — Maryland Geological Survey. 



[Maynard.] 



Class CEPHALOPODA 



Subclass TETRABRANCHIATA 



Order NAUTILOIDEA 



Suborder ORTHOCHOANITES 



Family ORTHOCERATIDAE 



Genus ORTHOCERAS Breyn 



Orthocekas longicameratum Hall 

 Plate LXXXVIII, Figs. 1-3 



Orthoceras longicameratum Hall, 1859, Nat. Hist. N. Y., Pal., vol. ill, p. 343, 

 pi. Ixx, fig. 1; pi. Ixxi, figs. 1, 5, 1861. 



Description. — "Shell elongated, very gradually tapering; chamber ex- 

 tremely elongated. Septa numerous, highly arched, about four or five in 

 the space of the diameter of the shell. Siphuncle moniliform. Surface 

 unknown." Hall, 1859. 



The exact horizon is unknown. 



Occurrence. — Helderberg Formation. Cumberland. 



Collection. — U. S. National Museum. 



[Ohern.] 



Orthoceras schucherti n. sp. 

 Plate LXXXVIII, Fig. 1 

 Description. — Shell subcylindrieal, tapering very gradually; septa con- 

 vex, siphuncle not observed. Surface marked by numerous simple rounded 



