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THE PALEONTOLOGY OF MINNESOTA. 
| List of Cephalopoda. 
LIST OF SPECIES OF CEPHALOPODA HERE DESCRIBED. 
Pilocerus newlon-winchelli, Sp. DOV. 
Nunno aulema, Ciarke. 
Cyrlocerina (?) schoolerafti, sp. DOV. 
Cameroceras proteiforme, Hall. 
Cameroceras hennepini, Sp. DOV. 
Cameroceras, Sp. 
Cameroceras, Sp. DOV. 
Actinoceras bigsbyi, Stokes. 
Actinoceras beloitense, Whittield. 
Actinoceras remotiseptum, Hall. 
Orthoceras nicoleti, sp. nov. 
Orthoceras anellus, Conrad. 
Orthoceras perroti, Sp. NOV. 
Orthoceras lesueuri, Sp. NOV. 
Orthoceras bilineatum, Hall. 
Orthoceras olorus, Hall. 
Orthoceras tenuistriatum, Hall, 
Orthoceras sociale, Hall. 
Orthoceras beltrami, sp. nov. 
Orthoceras multicameratum, Emmons. 
Orthoceras junceum, Hall. 
Orthoceras ef. amplicameratum, Hall. 
Triptoceras planoconvecum, Hall. 
Triptoceras planodorsatum, Whitfield. 
Triptoceras oweni, Sp. NOV. 
Triptoceras lambi, Whiteaves. 
Triptoceras, sp. ? 
Gonioceras anceps, Hall. 
Gonioceras becidentale, Hall. 
Poterioceras apertum, Whiteaves. 
Olinoceras mumiceforme, Whitfield. 
Oncoceras exiguum, Billings. 
Oncoceras minnesotense, Sp. BOY. 
Oncoceras lycum, Hall. 
Oncoceras carveri, Sp. NOV. 
Oncocerds douglassi, sp. nov. 
Oncoceras pandion, Hall. 
Cyrtoceras neleus, Hall. 
Cyrtoceras camurum, Whitfield. 
Cyrtoceras hallianum, D’Orbigny. 
Cyrtoceras billingsi, Salter. 
Oyrtoceras houghtoni, sp. nov. 
Oyrtoceras featherstonhaughi, sp. DOV. 
Cyrtoceras minneapolis, sp. nov. 
Cyrtoceras corniculum, Hall. 
Oyrtoceras norwoodi, sp. nov. 
Cyrtoceras shumardi, sp. nov. 
Oyrtoceras scofieldi, sp. NOV. 
Gyroceras duplicicostatum, Whitfield. 
Eurystomites undatus var. occidentalis, Hall. 
Nore ro PAGE 769.—Since recording the observations given upon the structure of Nanno aulema, 
the original material has been placed in the hands of Professor Alpheus Hyatt for further elucidation. 
Prof. Hyatt’s conclusions, not wholly confirmatory of my inferences, will be published in the “ American 
Geologist” for July, 1895. 
Nore to Page 774.—The Endoceras-atfinities of the genus Cyrtocerina have been confirmed by 
Holm’s discovery by of large species of this genus with dorsal siphcnes of great size and typical structure. 
(Om tvenne Gyroceras-formight bojda Endoceras-arter; Geol. Foren. i Stockh. Férhandl. vol. 14, 1892). 
Errata for the Chapter on Cephalopoda. 
Page 766, line 14, after filaments, insert or canals. 
Page 774; the application of the terms dorsal and ventral on this page should be reversed. 
Page 777, reference to plates, second line omit 4. 
Page 784, reference to plates; for LI read LV; for XLII read XLVI, 
