572 INDEX 



PAGE 



Obolus cf. Leda Walcott, 6411 473 



tetonensis Walcott, Ozarkian, described 486 



damo Walcott 480 



described 69 



figured, pi. 10, figs. 6, 6a 109 



dolatus Sardson, compared 487 



(Fordinia) gilberti Walcott, compared 488 



nestor, new species, Upper Cambrian, described 488 



figured, pi. 106, figs. 1, 2 536 



ino Walcott 473 



ion, new species, Ozarkian, described 482 



figured, pi. 106, figs. 8-10 534 



leda Walcott, Ozarkian, described 483 



figured, pi. 106, figs. 12-15 . . : 534 



(Lingulobolus) spissus (Billings), compared 493 



matinalis (Hall), compared 486 



mcconnelli decipiens Walcott, compared 484 



Walcott, compared 484, 487, 496 



mollisonensis Walcott 471, 480 



myron, new species, Upper Cambrian, described 484 



figured, pi. 107, figs. 1-3 535 



parvus Walcott 20 



perone Walcott, figured, pi. 107, figs. 1-3 534 



sp. undt. (fragments) „• 473 



tetonensis Walcott, compared 483, 485 



figured, pi. 107, figs. 4, 5 535 



teuta, new species, Ozarkian, described 486 



figured, pi. 107, fig. 6 535 



(Westonia) ella Hall, compared 488 



findlandensis Walcott, compared 523 



iphis Walcott 467 



ollius, new species, Upper Cambrian, described 487 



figured, pi. 121, figs. 8-10 549 



sp. undt., Ozarkian 481 



described 523 



stoneanus (Whitfield) , compared 487 



tertia, new species, Ordovician, described 487 



figured, pi. 107, figs. 7, 8 535 



whymperi, new species, Lower Cambrian, described 487 



figured, pi. 121, figs. 4-7 549 



Obolus wortheni Walcott 475 



Octactinellidae Hinde, family described 322 



Odontopleura, thoracic limbs 160, 161 



trentonensis (Hall), described 153 



Oldest known trilobite fauna, note on occurrence of 431 



Olenellus, dorsal shield 176 



in Mount Whyte fauna 62 



claytoni 431 



Olenoides, compared with Kootenia 131 



