PLATE 26 FIGURES 1-2. Calliostoma nottowayense Gardner, n. sp. (p. 186). 1. Apertural view of holotype (U. S. Nat. Mus. 325466), from the Yorktown formation at Sycamore, Nottoway River, Southampton County, Va.; height 9.3 millimeters; diameter 11.1 millimeters. X 4. 2. Basal view of holotype. X 4. FIGURES 3- 4. Calliostoma carolinense Gardner, n. sp. (p. 184). 3. Basal view of holoLype (U. S. Nat. Mus. 325472, from the Yorktown formation at Hamilton Bluff, Roanoke River, Martin County, N. C.; height 9.8 millimeters; diameter 11.2 millimeters. X 4. 4. Apertural view of holotype. X 4. FIGURE 5. Calliostoma conradi Gardner, n. sp. (p. 186). Basal view of holotype (U.S. Nat. Mus. 325468), from Yorktown formation at Yorktown, Va.; height 9.8 millimeLers; diameter 11.9 millimeters. X 3. FIGURE 6. Calliosloma armillatum (Tuomey and Holmes) (p. 186). Apertural view of specimen (U. S. Nat. Mus. 113060), from near the Katural Well, Duplin County, N. C.; height 6.2 millimeters; diameter 8.8 millimeters. X 4. FIGURES 7-8. Calliostoma cyclum Dall (p. 186). 7. Apertural view of holotype (U.S. Nat. Mus. 113062), from the Natural Well, Duplin County, N.C.; height 3.6. millimeters; diameter 5.2 millimeters. X 7. (After Dall.) 8. Basal view of holotype. X 7. (After Dall.) FIGURE 9. Calliostoma conmdi Gardner, n. sp. (p. 186). Apertural view of holotype shown in figure 5. X 3. FIGURE 10. Calliostoma labrosum (Conrad) (p. 185). Apertural view of topotype (U. S. Nat. Mus. 113050), from the James River, Va.; height 7.3 millimeters; diameter 9.3 millimeters. X 4. FIGURE 11. Calliostoma basicwn Dall (p. 184). Apertural view of holotype (U.S. Nat. Mus. 113022), from the Yorktown formation at Petersburg, Va.; height 15.4 millimeters, diameter 14.5 millimeters. X 2. FIGURE 12. Calliostoma virginicum (Conrad) (p. 185). Apertural view of specimen (U. S. Nat. Mus. 113036), from Yorktown, Va.; height 12.8 millimeters; diameter 13.2 millimeters. X 3. (After Dall.) FIGURES 13-14. Callios.toma hertjordense Gardner, n. sp. (p. 185). 13. Apertural view of holotype (U.S. Nat. Mus. 325469), from Yorktown formation, l)lz miles above Murfreesboro, Hertford County, N. C.; height 7.3 millimeters; diameter 8.8 millimeters. X 4. 14. Basal view of holotype. X 4. FIGURE 15. Calliostoma philanthropum pontoni Mansfield (p. 184). Apertural view of holotype (U.S. Nat. Mus. 370482), from the Choctawhatchee formation at Harveys Creek, half a mile above abandoned mill, Leon County, Fla.; height 17 millimeters; diameter 17 millimeters. X 2. (After Mansfield.) FIGURES 16- 17. Calliostoma virginicum gizehi Gardner, n. subsp. (p. 185). 16. Apertural view of holotype (U. S. Nat. Mus. 325467), from Yorktown formation, zone 2, at Yorktown, Va.; height 9.2 millimeters; diameter 10.5 millimeters. X 3)1z. 17. Basal view of holotype. X 3}f. FIGURE 18. Calliostoma ruffinii (H. C. Lea) (p. 184). Apertural view of holotype (Acad. Nat. Sci. Philadelphia 1548), from the Yorktown formation at Petersburg, Va. X 4. FIGURE 19. Calliostoma milchelli (Conrad) (p. 184). Apertural view of holotype (Acad. Nat. Sci. Philadelphia), from James River, Va. X 2. FIGURES 20- 21. Calliostoma cheopsi Gardner, n. sp. (p. 183). 20. Basal view of holotype (U. S. Nat. Mus. 325470), from the Yorktown formation, 8 to 9 miles southeast of Greenville, Pitt County, N. C.; height 11.1 millimeters; diameter 10.0 millimeters. X 4. 21. Apertural view of holotype. X 4. FIGURE 22. Calliostoma harrisii Dall (p. 186). Apertural view of holotype (U. S. Nat. Mus. 113052), from Bellefield, near Yorktown, Va.; height 10.4 millimeters; diameter 11.6 millimeters. X 3)1z. (After Dall.) FIGURE 23. Calliostoma mitchelli (Conrad) (p. 184). Basal view of holotype shown in figure 19. X 2. 284
GEOLOGICAL SURVEY PROF'ESSIONAL PAPER 199 PLATE 26 13 5 1 17 2 3 14 GASTROPODS 7 8 12