486 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Protypus, mentioned 279, 318, 345 



Heldensis, mentioned . 318 



stratigraphic position and association 215 



new species, stratigraphic position and association 213, 215 



sp. undt., stratigraphic position and association 214 



Pseudo-area, defined 158 



Pseudo-pedicle groove, defined 158 



PseudochiHdium, defined 158 



Pseudocruralium, defined 158 



Pseudodeltidium, defined 158 



Pseudospondylium, defined 158 



Ptarmigan Lake, view of ridge near pl- 46, fig. i 



Ptarmigan Pass, fossils from 319, 330, 331 



Ptarmigan Peak, Hector shales on 429 



Lower Cambrian conglomerate on 426 



Pterocephalus ?, stratigraphic position and association 204 



Ptychaspis, stratigraphic position and association 176 



Ptyclioparia, mentioned 21, 102, 300, 315, 318 



cordillercB, mentioned 25 



stratigraphic position and association 211 



kingi, stratigraphic position and association 180, 181 



palliseri, stratigraphic position and association 211 



piochensis, mentioned 25 



stratigraphic position and association 183, 197 



subcoronata, stratigraphic position and association 196 



sp. undt., stratigraphic position and association. .175, 176, 178, 179, 180, 



181, 182, 183, 189, 192, 193, 194, 195, 196, 197, 198, 199, 201, 202, 204, 

 205, 208, 209, 210, 211, 212, 213, 214, 215. 

 pugio, see Neolenus intermedins. 

 pulchra, see Botsfordia. 

 pupa, see Bathyttriscus. 

 pusillus, see Paradoxides. 



Pygidium of the Mesonacidse discussed 245-246 



pyxidicula, see Acrotreta. 

 quadriceps, see Dorypyge. 

 quadrilineata, see Acrothele. 



Quehecia, classification of 142, 145 



evolution of pi. 11 (pp. 140-141) 



nature of shell substance 150 



Rafinesquinas, classification of 142 



defined 148 



Raphistoma sp., stratigraphic position and association 173 



rara, sec Nisusia. 



Raw, Frank, acknowledgments 235, 283 



bibliographic reference ^77 



manuscript notes copied 283 



Reagan formation, Oklahoma, fossils in 97 



Redlich, K. A., bibliographic reference 114 



