Revision and internal structures of Leurocycloceras

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Abstract
Leurocycloceras is revised on the basis of internal and external shell features to include Silurian spp. formerly included in Cycloceras and Geisonoceras. Internal structure is uniform and of the type of "Orthoceras" brucense, which species falls within the genus as redefined. The known American spp. are summarized and one new one is descr. Mention is made of European forms. The nomen-clatorial problem and isomorphism of early Paleozoic "Cycloceras" is summarized. A dolomitized internal mold shows details of the cameral deposits. A new type of lobation of cameral deposits, evidence of vascular tubes in the cameral mantle and of parasitic organisms living in cavities in the cameral deposits are discussed.

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