Report of the United States Geological Survey of the territories . PLATE 23. 1. Placenticeeas placenta, var. intercalaris 468 1, a. A side view of the septate type-specimen of the variety. l,h. A different view of same, showing the narrowly truncated and flattened, or slightly concave, periphery, and the sagittate form of the aperture, as indicated by a section of one of the , c. A septum, magnified about one and a half diameters. -U,5\(|:uo[0atL\it^U!! I g»o. I .. PLATE 2-4. Page. Pig. 1. Ammonites complexus 447 l,a. A side view of a small specimen, consisting enti
Report of the United States Geological Survey of the territories . PLATE 23. 1. Placenticeeas placenta, var. intercalaris 468 1, a. A side view of the septate type-specimen of the variety. l,h. A different view of same, showing the narrowly truncated and flattened, or slightly concave, periphery, and the sagittate form of the aperture, as indicated by a section of one of the , c. A septum, magnified about one and a half diameters. -U,5\(|:uo[0atL\it^U!! I g»o. I .. PLATE 2-4. Page. Pig. 1. Ammonites complexus 447 l,a. A side view of a small specimen, consisting entirely of septate volutions. 1, b. An outline peripheral and aperture view of ,e. A septum of same, magnified. Fig. 2. Placenticeuas placenta 465 2, a. A side view of a small specimen, consisting of the iuner septate volutions. 2, 6. Another view of same, showing the very narrowly truncated periphery, the sagittate form of the aperture as indicated by a section of one of the inner volutions, and the sur-face of a septum, with its numerous 3. Piiyllocekas ? Halli _ 458 3, a. A side view of the type-specimen, which retains a part of the distorted outer , b. A peripheral view of the same, with the outer volutiou too much distorted by pressure to show the form of the aperture accurately by its , c. A septum of the same, magnified to about one aud a half diameters iUl1uk;U§k i I (>rl Iicitc Group I- LVIli! 2b
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1876
