...minute erect tubercle; cerci simple, conical. This genus is very distinct from anything known to me, and I have been in some doubt as to whether it should be placed in Melanopli, especially as in the only male I have seen there were but eight spines on the outer side...

...caly.r. Smith, TJ. S. Oeol. Surv., Mon. 42, p. 62, pl. IS, figs. 1-11. Lower Carboniferous : Moorefleld, Ark. This species attains a medium size, with a crescentic...in some doubt as to whether it should be placed in Gastnoceras at all, rather than in Goniatites ss It is narrower than the typical species of the genus,...

...strong, when the elevations have the appearance of being sublamellose. Gastrioceras richardsonianuiti is by no means a typical representative of the genus,...nodes. Except for the umbilicus, which is somewhat largo, the configuration is rather that of Goniatites, and certain members of that genus appear to...

...minute erect tubercie; cerci simple, conical. This genus Is very distinct from anything known to me, and I have been in some doubt as to whether it should be placed in Melanopli, especially as in the only male I have seen there were but eight spines on the outer side...

...minute erect tubercle; cerci simple, conical. This genus is very distinct from anything known to me, and I have been in some doubt as to whether it should be placed in Mclanopli, especially as in the only male [ have seen there were but eight spines on the outer side...

...relatively to the size much less strong, when the elevations have the appearance of being sublarnellose. Gastrioceras richardsonianum is by no means a typical representative of the genus, and I have l)een in some doubt as to whether it should be placed in Gastrioceras at all, rather than in Goniatites...