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adult specimens varies alveoli antetheca average heights average number average thicknesses average tunnel angles Axial section Axial section.—The fluting Brewster County chamber cavity chomata are strong convex lateral slopes DIAMETER LENGTH FORM diaphanotheca Dunbar and Condra Economic Geology Coll Exterior.—Test fibers fifth figs Figured specimens.—Bureau foraminifera furrows are shallow Fusulina fusulinid Galloway and Ryniker genus Glass Mountains Harpersville individual variations Jack County Jacksboro Keechi Creek last whorls later whorls LENGTH FORM RATIO limestone M. P. White Median section miles by road number of septa Ontogenetic series Palo Pinto County Pecos County ratio with growth Schwagerina second sample septa per volution septal furrows Septal pores seventh whorl shale sixth whorl specimens shows specimens.—Bureau of Economic STAGE DIAMETER LENGTH Stephens County straight axis successive volutions successive whorls thin sections thin tectum third sample tion Variation Average wall in successive wall is composed whorl of specimens whorl respectively young to gerontic