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conch, of Calocyrtoceras is generally characteristic of its family, the Paraphragmitidae, an annulated cyrtocone. In the case of Calocyrtoceras striated...

close spaced and transverse and the surface is transversely striated. Calocyrtoceras from the Middle Silurian of both Europe and North America is striated...

profile. Annulations slope dorso-ventally to the rear as they do in Calocyrtoceras. Striations on the surface, fine goove-like features, are longitudinal...

†Buttsoceras †Byronoceras †Calchasiceras †Calhounoceras †Callaionautilus †Calocyrtoceras †Cameroceras †Campbelloceras †Campendoceras †Campyloceras †Capriocornites...