438 INDEX 



Dikclocephalus — Continued. page 



f dalyi Walcott, new species described 367 



figured, pi. 64, figs. i-S .' 400 



associated with Illcenurus elongata n. sp 368 



compared with Anomocare and Anomocarella 2)^7 



Dikelocephahts hartti 367 



Dikclocephalus minnesotcnsis 367 



formation and locality 368 



listed under description of genus 367 



stratigraphic position unknown 359 



eatoni (^Platycolpus), species referred by Whitfield 366 



Aabellifer Hall and Whitefild (=Apatokephalus ?) 366 



granulosus (^Ptychaspis), species named by Owen in 1852 365 



referred by Hall to Ptychaspis 366 



hartti (Walcott), described and discussed 273, 368 



figured, pi. 44, figs. 1-7, 7a 294 



pi. 63. figs. 1-7, 7a 398 



compared with Dikclocephalus ? dalyi 367 



Dikclocephalus minnesotcnsis and Lonchoccphalus cal- 



cifcrus 274 



Dikclocephalus tribulis 274 



Dikclocephalus ? tribulis 2i72 



formation and locality 368, 369 



from " Kittatinny " limestone 255 



in synonymy 273, 368 



listed from Potsdam-Hoyt fauna 254 



" Saratogian," Hoyt quarry 253 



under description of genus 2)(>7 



Protichnites tracks left by 278 



surface of, described 364 



iowensis (^ Crepicephalus), species named by Owen in 1852 365 



referred by Hall to Conocephalitcs 366 



? linibatus Hall, described 369 



figured, pi. 65, figs. 5-8 402 



about Devils Lake, Wisconsin 360 



compared with Dikclocephalus minnesotcnsis 369 



Dikclocephalus sp. undt. (footnote) 391 



in synonymy 369 



listed from locality 78 361 



from locality 78b 361 



under description of genus 367 



with St. Lawrence fauna 356 



cf. limbatus Hall, in association with Saukia pepinensis 382 



listed from Jordan formation 355 



lodcnsis (Whitfield), compared with Ptychaspis speciosus 273 



genotype of Saukia 374 



magnificus (^ Apatokephalus ff), species referred by Billings.... 365 



megalops {^= Anomocarella) , species referred by Billings 365 



miniscaensis {-^^ Ptychaspis) , species named by Owen in 1852 365 



referred by Hall to Ptychaspis 366 



