Cephalopods of the Pierre formation of Wallace County, Kansas, and adjacent area

THE UNIVERSITY OP KANSAS SCIENCE BULLETIN Vol. XXL] March, 1933. [No. 9. Cephalopods of the Pierre Formation of Wallace County, Kansas, and Adjacent Area MAXIM K. ELIAS TABLE OF CONTENTS Introduction 290 Stratigraphic range of the described species 290 Methods of drawing sutures of Baculites and other Ammonoidea 290 Description of the species 294 Baculites 297 Heteroceras 313 Scaphiles 314 Acanthoscaphites 320 Discoscaphites 323 Placcnticeras 33 1 Plates 334 Abstract : The paper is devoted chiefly to the description and to the discus-sion of stratigraphic vakie of some of the Upper Cretaceous ammonoids of the Baculites and Scaphites group in western Kansas and adjacent part of Colorado. The following new names are introduced : Baculites pseudovatus Elias, n. sp. Baculites pseudovatus var. A. Elias, n. var. Bacidites conipressus var. reesidei Elias, n. var. Baculites compressus var. corrugatus Elias, n. var. Baculites clinolohatus Elias, n. sp. Baculites meeki Elias, n. sp. Discoscaphites nicolleti v^ar. saltgrassensis Elias n. var. The specific name compressus Say is very narrowly restricted to the topotype of the species Baculites compressus as described by Meek (1854, 1876). Sca-phites nodosus var. plenus Meek is removed from the Acantoscaphites nodosus group and is elevated to the rank of species of the genus Scaphites sensu stricto : Scaphites plenus (Meek). (289)