478 INDEX 



Protichnites — Continued. page 



species listed 275, 276 



tracks, left by Dikclocephalus 278 



Neolenus serratus (Rominger) 277 



trails compared with Climactichnites (synonymy) 259 



alternans, mentioned under genus 276 



latus, mentioned under genus 275 



lineatus, mentioned under genus 276 



logananus Marsh, described 279 



figured, pis. 48, 49 302=304 



in synonymy 279 



listed from Potsdam-Hoyt fauna 254 



miiltinotatus, mentioned under genus 275 



octo-notaius, mentioned under genus 275 



septemnotatus Owen, described 278 



figured, pis. 46, 47 298=300 



in synonymy 278 



tracks made by species of Dikclocephalus 278 



mentioned under genus 275 



jwilsoni Logan, listed from Potsdam-Hoyt fauna 254 



Protocaris, single specimen of 157 



Protolenus Matthew, occurrence of 240 



Protopodite, thoracic appendage 159 



Protozoa, listed from Potsdam-Hoyt fauna 254 



Protypus fieldcnsis Walcott, absent from new Lower Cambrian subfauna. . 310 



Ptarmigan Peak, changed to Titkana (bird) Peak 331 



Pterocephahis, generic name bracketed by Hall and Whitfield with Dikclo- 

 cephalus 366 



busiris Walcott, compared with Pterocephalus ? liches 80 



f liches Walcott, new species described and discussed 80 



figured, pi. 14, fig. 12 102 



compared with Pterocephalus busiris Walcott 80 



listed, Cambrian faunas of China 73 



Pteropoda, listed from Potsdam-Hoyt fauna ^ 254 



Pterygotus, branchial fringes of, mentioned 20 



compared with Amiella 27 



Amiella ornata 28 



and Eurypterus, related to Beltina 21 



bilobus Salter, compared with Sidneyia inexpectans 206 



bilobus Salter var. inornatus Woodward 28 



compared with Amiella ornata 28 



Ptychaspis Hall, genus named 272 



association of, with Conokephalina 362 



Owen's species of Dikclocephalus referred by Hall to 366 



baubo (Walcott) (= Dikclocephalus ? baubo Walcott), present and 



former generic reference 71 



briso (Walcott) {^Dikclocephalus ? briso Walcott), present and 



former generic reference 71 



granulosa (Owen), compared with Ptychaspis speciosus 273 



listed from Franconia formation 357 



