INDEX 571 



PAGE 



Neolenus constans Walcott, described 45 



figured, pi. 6, figs. 7, ja 59 



serratus Rominger 126, 369-375, 380-394, 420, 421 



compared with Anaspides tasmamce 166 



Calymcnc and Triarthrus 203, 204 



Ptychoparia and others 126 



figured, pis. 14-23 180=189 



figured, pi. 91, figs. 1, 2 434 



pi. 92, figs. 1-6 435 



pi. 93, figs. 1, 2 436 



pi. 94, fig. 1 437 



text fig. 11 371 



fig. 12 372 



fig. 13 373 



figs. 14, 14a 375 



fig. IS 383 



fig. 21 421 



individual specimens of, notes on 387 



notes on ventral appendages of 366 



restoration of ventral surface of 392 



Nevadia weeksi Walcott 431 



Niobe ? echidcs Walcott 473 



? nonius Walcott 473 



? phormis Walcott 473 



Nisusia alberta Walcott, compared 499 



figured, pi. in, figs. 1, la 538 



burgessensis, new species, Middle Cambrian, described 499 



figured, pi. no, figs. 1-8 538 



cf . alberta Walcott, described 26 



figured, pi. 4, fig. 9 S3 



festinata (Billings), Atlantic Province and Mount Whyte fauna.... 66 



compared 499 



transversa Walcott, compared 499 



(Jamesella) oriens, new species, described 500 



figured, pi. no, figs. 9-14 538 



per pasta (Pompecki), compared 500 



spinigcra, new species, Upper Cambrian, described 498 



figured, pi. 109, figs. 15-17 537 



Nomenclature of some post-Cambrian and pre-Cambrian formations 



(Walcott) 457, 479 



Nostoc Vaucher, compared 226 



commune Vaucher, compared 222 



parmeloides Kutzing, compared 222 



sphaericum Vaucher, compared 223, 230 



Nostocaceae, family described 225 



Notostraca Sars 530 



Novaya Zemlya, Russia, brachiopods of 481 



Obolella nuda Walcott 480 



(L. ) pretiosa Billings 268 



