Report on paleontology . vOLUTID/E OF THE EOCENE LAYERS OF THE UPPER BED GREENSAND MARLS. PLATE XXXII. EXPLANATION OF PLATE XXXII. VOLUTA Nkwcombiana Wliitf. (p. 211). Figs. 1,2. Two views of a specimen of the ordinary form. 3. View of a shorter spired form showing cavities of the columellar folds. These are fromthe collection Am. Mus. Nat. Hist. VoLUTA. Vesta Whitf. (p. 210). 4,5. Two views of an imperfect cast. 6. Represents the lower part of specimen shown by the faint line on Fig. 4, removed to showth e folds on its lower surface. Am. Mus. Nat. U. S, GEOLOGICAL ^.URVEY MOriOGRAPH
Report on paleontology . vOLUTID/E OF THE EOCENE LAYERS OF THE UPPER BED GREENSAND MARLS. PLATE XXXII. EXPLANATION OF PLATE XXXII. VOLUTA Nkwcombiana Wliitf. (p. 211). Figs. 1,2. Two views of a specimen of the ordinary form. 3. View of a shorter spired form showing cavities of the columellar folds. These are fromthe collection Am. Mus. Nat. Hist. VoLUTA. Vesta Whitf. (p. 210). 4,5. Two views of an imperfect cast. 6. Represents the lower part of specimen shown by the faint line on Fig. 4, removed to showth e folds on its lower surface. Am. Mus. Nat. U. S, GEOLOGICAL ^.URVEY MOriOGRAPH XVIII PLATE XX. VOLUTID/E OF THE EOCENE LAYERS OF THE UPPER BED GREENSAND MARLS, PLATE XXXIII EXPLANATION OF PLATE XXXIII. Cancellaria rodis Whitf. (p. 214).Figs. 1,2. Opposite sides of the oast sliowiiig the featares described. Pledrotoma surcultiformis Whitf. (p. 215). 3. View of a specimea of the ordinary form. 4. View of a larger and more robust specimen. SURCULA perobesa Whitf. (p. 217). 5,6. Opposite sides of the best specimens observed. Plburotoma regularicostata Whitf. (p. 215). 7-9. Views of three casts referred to the species. The last, showing no plicae on the last volu-tion, is from the collection Am. Mus. Nat. Hist., New York City. Plburotoma (Surcula) altispira Whitf. (p. 216). 10,11. Opposite sides of the same cast. Am. Mus. Nat. Hist., New York City. 12. View of a fragment showing the striae more strongly. 13. View of another specimen doubtfully of this species. Sdrculiies annosus Conrad (p. 218). 14. View of the back of the specimen upon which Mr. Conrad founded his species and genus
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