576 INDEX 



Ptychostegium — Continued. page 



congeneris (Walcott) 467 



fulvia Walcott | 472 



idahoensis Walcott 474 



mccoyi Walcott 467 



robsonensis Walcott 474 



robsonensis valaltum Walcott 474 



spinosum Walcott 474 



zrictori Walcott 472 



Pygidial endopodites of Triarthrus 415 



Pygidium, use of, in swimming 428 



Ranger Canyon 460 



Raphistoma melius Walcott 47 2 



menos Walcott ' 474 



Rauff, Hermann '. 220, 306, 309 



Raymond, Dr. Percy E....118, 169, 176, 378, 379, 380, 382, 384, 387, 388, 



389, 413, 415, 424, 425, 429, 430 



Raymond Memoir 379 



Red Algae, genera and species listed 222 



Reed, Frank S 219 



Resser, Dr. Charles E 481 



Rhaphidophlus, compared 282 



Rhaphidophlus filifer Ridley and Dendy, compared 285 



Rhodophyceae (Red Algae) 236 



Rhodophyceae, genera and species listed 222 



Ridley and Dendy 269 



Ridley, Stuart O., species named for 294 



Robson Peak District 22, 458 



Rogeria ? ephorus Walcott 473 



Ross Lake cirque, illustrated 14 



ridge above, section illustrated 15 



shale fauna 19, 22 



member, Ptarmigan formation 4 



Ruedemann, Rudolph 236, 366, 368, 369, 371, 380, 389 



St. Charles formation 474 



fauna 474, 475 



St. Piran formation 16 



Salpa, Brooks' memoir on (footnote) 169 



Sarbach formation (Ordovician) 459 



fauna 459 



Sarceen formation 480 



Sarceen (Ozarkian, Lower) 471 



Saukia ? glaucus Walcott 473 



marica Walcott (5411) 475 



oneidacnsis Walcott 475 



splendens Walcott 6411 473 



Sawback Range 465 



Sayce, cited 171, 172 



Schizambon typicalis Walcott 467 



