224 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



24616. Dicellocephalus richmondensis Walcott. Cotypes. 



Middle Cambrian. New York Canyon, Eureka District, 

 Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 41, pi. 10, fig. 7. 



= Ptychoparia richmondensis. 



15447. Dicellocephalus wahsatchensis Hall and Whitfield. 



Cotypes. 

 Middle Cambrian. Canyon above Calls Fort, Wahsatch 

 Range, Utah. 



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

 II, 1877, p. 241, pi. 1, fig. 35. 



= Olenoides wahsatchensis. 

 See Dicellocephalus gothicus. 



1025. Dicellomus nanus (Meek and Hayden). Cotypes. 



Upper Cambrian. Central portions of Black Hills, South 

 Dakota. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 447, 

 pi. 60, figs. 3b, 3d. 



See Obolella nana. 



35209. Dicellomus nanus (Meek and Hayden). Plesiotypes. 



35210. Gallatin (Upper Cambrian). Gallatin Range, Yellowstone 



National Park, and Little Rocky Mountains, Montana. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 447, pi. 

 60, figs. 3, 3a, 3c. 



See Obolella nana. 



35211. Dicellomus politus (Hall). Plesiotypes. 



Middle Cambrian. Wisconsin. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1S99, p. 446, pi. 

 60, figs. 4, 4a. 



15S300. Dichoccenia alabamensis Yaughan. Holotype. 



Midway (Eocene). Prairie Creek, Alabama. 



Vaughan, Mon. XXXIX, U. S. Geol. Surv., 1900, p. 139, pi. 15, 

 figs. 4-4C. 



35092. Dichocrinus inornatus Wachsmuth and Springer. 



Plesiotype. 

 Kinderhook (Miss.). Quarry, Marshall County, Iowa. 



Grabau, Araer. Journ. Sci. (4), XVI, 1903, p. 297, figs. 9, 10 on 

 p. 29S. 



43749. Dichotrypa elegans Ulrich. Cotypes. 



St. Louis (Miss. ). Elizabethtown, Kentucky. 



Ulrich, Geol. Surv. 111., VIII, 1890, p. 500, pi. 76, figs. 8, 8b, Sc, 8d. 



433S7. Dichotrypa foliata Ulrich. Cotypes. 



Middle Devonian. Buffalo, Iowa. 



Ulrich, Geol. Surv. 111., VIII, 1S90, p. 499, pi. 42, figs. 2-2g. 



