INDEX 475 



PAGE 



" Pelmatozoic stage," Echinodermata passed through 44 



" Peltato-digitate " . tentacles, characterizing Eldonia hidwigi 49 



Peltiira (Pygidia), listed in stratigraphic section 336 



Pemphigaspis btdlata Hall, listed from Eau Claire formation 358 



Pennsylvania, Lower Cambrian localities I2V and I2w, Lancaster ..246, 314 



Lower Ozarkian localities 5911 and 590 384 



pepinensis, see Dikcloccphalus and Saukia. 

 perattcniiata, see Lingulella. 

 perfecta, see Callavia and Hymenocaris. 

 perseus, see Conaspis and Conocephalites. 



Peytoia Walcott, new genus described 55 



genotype, Peytoia nathorsti 56 



geographic distribution 56 



stratigraphic range 56 



nathorsti Walcott, new species described 56 



figured, pi. 8, figs, i, 2 58 



associated with Eldonia ludwigi 51 



Eldonia ludwigi 57 



Ptychoparia cordillera 57 



Neolenus serratus 57 



Sidneyia inexpectans 57 



compared with Laotira cambria and Mcdusina costata 57 



dimensions 56 



stratigraphic position and association 153 



Phillips Mountain, Robson Peak district, new name Z2>i 



locality described 329 



illustrated, pi. 57, fig. 2 338-339 



pl. 58, fig. I 340-341 



Phyllocarida, descendant from Branchiopoda 164 



first known in Lower Cambrian by Isoxys 155 



foreshadowed by Burgess shale fauna 165 



represented by Nebalia 162 



mentioned 162 



Phyllopod bed, described and subdivided 152 



locality defined (footnote) 130 



Physa, ancestors of ' 166 



Pika Mountain, Alberta, generic name derived from 132 



Pikaia Walcott, new genus described 131 



genotype, Pikaia gracilens 131 



geographic distribution 132 



stratigraphic range 132 



gracilens Walcott, new species described 132 



figured, pi. 20, figs, i, 2 138 



suggests Nephthydidse 132 



compared with Polychseta 132 



stratigraphic position and association 152 



Pikaidie Walcott, new family described 131 



Pincher Post Office, Alberta, Canada, Algonkian locality 14Z 40 



pinnaformis, see Lingulella. 

 planifrons, see Dikelocephalus. 



