222 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



24563. Dicellocephalus finalis Walcott. Cotypes. 



Upper Pogonip (Ord.)- Ridge east of Hamburg Ridge, 

 Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 18S4, p. 89, pi. 12, figs. 

 12, 12a, 22. 



24569. Dicellocephalus flabellifer Hall and Whitfield. Cotypes. 



Upper Cambrian. West side of Pogonip Mountain, White 

 Pine District, Nevada. 



Hall and Whitfield, Rept. U. S. Geol. Expl. 40th Par., iv", Pt. II, 

 1877, p. 227, pi. 2, figs. 29, 30. 



8563. Dicellocephalus ? flagricaudus White. Cotypes. 



15452. Middle Cambrian. Schellbourne, Schell Creek Range, 



Nevada. 



White, Prelim. Rept. U. S. Geogr. Surv. W. 100th Merid., 1874, 

 p. 12; Rept. U. S. Geogr. Surv. W: 100th Merid., IV, Pt. I, 

 1877, p. 60, pi. 3, figs. 8a, 8b. 



= Zacanthoides flagricaudus. 

 See Olenoides? flagricaudus. 



15447. Dicellocephalus? gothicus Hall and Whitfield. Holotype. 

 Middle Cambrian. Canyon above Calls Fort, Wahsatch 

 Range, Utah. 



Hall and Whitfield, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. II, 

 1S77, p. 242, pi. 1, fig. 36. 



= Olenoides wahsatchensis. 



See Dicellocephalus wahsatchensis. 



24564. Dicellocephalus inexpectans Walcott. Cotypes. 



Lower Pogonip (Ord.). Ridge east of Hamburg Ridge, 

 Eureka District, Nevada. 

 Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 90, pi. 1, fig. 10. 



24566. Dicellocephalus iole Walcott. Cotypes. 



Upper Cambrian. Near Bull whacker Mine, Eureka Dis- 

 trict, Nevada. 

 Walcott, Mon. VIII, U. S. Geol. Surv., 1SS4, p. 43, pi. 10, fig. 19. 



17870. Dicellocephalus iowensis Owen. Cotypes. 



Middle Cambrian. Below mouth of Miniskah River, 

 Minnesota. 



Owen, Rept. Geol. Surv. Wis., Iowa, and Minn., 1852, p. 575, 

 pi. 1, fig. 4. 



= Crepicephalus ? iowensis. 



24565. Dicellocephalus marica Walcott. Cotypes. 



Upper Cambrian. Eureka District, Nevada. 



Walcott, Mon. VIII. U. S. Geol. Surv., 1884, p. 44, pi- 10, fig. 13. 



