350 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 5/ 



FORMER GENERIC REFERENCE. PRESENT GENERIC REFERENCE. 



Dikeloccphalus ccJiicus Salter (Mem. Geol. 



Surv. Great Britain. Vol. 3. 1866, p. 304) Undt. genus. Species founded 



on distorted pygidia. 

 Dikelocephaliis cristatus Billings (Canadian 



Nat. Geol., Vol. 5, i860, p. 312, text fig. 10) . . Conokephalina Brogger ? 

 Dikelocephaliis {?) corax Billings (Geol. Surv. 



Canada, Pal. Foss., Vol. i, 1865, p. 334. text 



fig. 3220-^) Genus undt. 



Dikelocephaliis crassimargiiiatus Whitfield 



(Geol. Wisconsin, Vol. 4, 1882, p. 344, pi. 27, 



fig. 14) Saukia Walcott. 



Dikelocephaliis dcvinei Billings (Geol. Surv. 



Canada, Pal. Foss., Vol. i, 1865, p. 195, fig. 



180) Ptychoparia ? Corda. 



Dikelocephalus dicraeurus (Angelin) (Lin- 



narsson) Brogger (Die Sil. Etagen 2 und 3, 



Kristiania, 1882, p. 126) Dikelokephalina dicracura. 



Dikelocephalus discoidalis Salter (Mem. Geol. 



Surv. Great Britain, Vol. 3, 1866, p. 304) . .. .Genus undt. Species founded 



on fragments of distorted cranidia. 

 Dikelocephalus dubius (Linnarsson) Brogger 



(Nyt Mag. for Naturvid., Vol. 35, 1897, P- 



175, figs, 5a-fc) Apatokephaliis dubius. 



Dikelocephalus eatoni Whitfield (Ann. Rep. 



Surv. Wisconsin for 1877, 1878, p. 65) Platycolpus Raymond. 



Dikelocephalus (f) expansus Walcott (Monogr. 



U. S. Geol. Surv., Vol. 8, 1884, p. 45, pL 9, 



fig. iq) DoHchometopus Angelin. 



Dikelocephalus Unalis Walcott (Monogr. U. S. 



Geol. Surv., Vol. 8, 1884, p. 89) ipatokcphalus Brogger (1896). 



Dikelocephalus Hagricaudiis White (Geog. and 



Geol. Expl. and Surv. West looth Merid., 



Vol. 4, pt. I, 1875, p. 60) Zacanihoides Walcott. 



Dikelocephalus HabelUfer Hall and Whitfield 



(U. S. Geol. Expl. 40th Pari., Vol. 4, 1877, p. 



227, pi. 2, figs. 29, 30) Apatokephalus Brogger (1896). 



Dikelocephalus florentinensis Etheridge (Rec- 

 ords Australian Museum, Sydney, Vol. 5, 



1905, p. 99, pl. 10, fig. 4) Dikelokephalina Brogger. 



Dikelocephalus {Centra pie lira ?) furca Salter 



(Mem. Geol. Surv. Great Britain, Vol. 3, 



1866, p. 303) Dikelokephalina Brogger. 



Dikelocephalus ? gothicus Hall and Whitfield 



(U. S. Geol. Expl. 40th Pari., Vol. 4, 1877, 



p. 242) Olenoides wasatchensis Hall 



and Whitfield. 

 Dikelocephalus grauiilosiis Owen (Rept. Geol. 



Surv. Wis., Iowa, and Minn., 1852, p. 57s) ■ -Ptychaspis Hall (1863). 



