INDEX 569 



PAGE 



Marpolia 222 



aequalis Walcott, new species, compared 235 



described 2 35 



figured, pi. 55, fig- 1 2 56 



spissa Walcott, new species, described 234 



figured, pi. 52, figs. 1, \a,b 253 



Walcott, new genus, described 233 



genotype, Marpolia spissa Walcott 233 



Marrella, compared with Calymene and Ceraurns 152 



Triarthrus becki I37> 140 



compared with trilobite 170 



exopodites of 375 



splendens Walcott 375, 376, 4i5» 427 



Maryvillia galeria Walcott 47 2 



Matthew, Dr. G. F., cited 263, 305, 307 



McDonnell, Dr. R. G 463 



Meagher limestone 17 



Megalapsis 47° 



? eucerus Walcott 472 



? sp. undt 47 2 



Menomonia gyges Walcott 474 



Merrill, Dr. George P., opinion quoted 232 



Mesonacidas, dorsal shield 176 



fusing of segments 127 



Mesonacis, in Mount Whyte fauna 62 



gilberti 21 



fauna 431 



(Meek), from British Columbia 66 



vermontana (Hall), from Atlantic Province 66 



Mickwitzia muralensis Walcott 480 



Microdiscus 43* 



Micromitra (Iphidella) pannula (White), Middle Cambrian, compared.. .. 69 



described 482 



figured, pi. 106, figs. 16-17 534 



(Paterina) charon Walcott 480 



described 69 



figured, pi. 10, figs. 3, 3a, b 108 



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



wapta Walcott 20, 21, 69 



zenobia Walcott, described 481 



figured, pi. 106, figs. 1-7 534 



Moberg and Segerberg 306 



Modocia ibicus Walcott 473 



Monactinellida Zittel, order described 269 



Mons formation (Ozarkian, Lower) 459 



fauna 460, 472, 473 



Alberta 472 



Moosia degener Walcott 471 



grandis Walcott 471 



