578 INDEX 



PAGE 



Syntrophia calcifera (Billings), compared 519 



campbelli "Walcott, compared ♦ S l 7 



cf. calcifera (Billings), Ozarkian, described 516 



isis, new species, Ozarkian 47 2 > 479 



described 5 1 7 



figured, pi. 117, figs. 14-17 545 



lateralis (Whitfield), compared 518 



nisis, new species, Ozarkian, compared 518 



described 5*7 



figured, pi. 119, figs. 1-3 547 



norms, new species, Ozarkian, described 518 



figured, pi. 1 19, figs. 4-9 '. 547 



nundina Walcott 474 



pcrilla, new species, Ozarkian, compared 518 



described 5^9 



figured, pi. 118, figs. 1-7 546 



rotundata Walcott, compared 5*7 



Syntrophidce, genera and species in Cordilleran area 5*5 



Tccniccphalus lycoria Walcott 475 



mittia Walcott (5a) 475 



Takakkawia Walcott, described 277 



lincata Walcott, described 277 



figured, pi. 87, figs. 4, 4a-c 361 



Tellinomya ? hamburgcnsis Walcott 467 



Tholiasterella, compared 3 2 3 



discussed 325, 326 



Tholiasterella Hinde, compared 3 2 8 



described 24 



? hindei Walcott described 25 



figured, pi. 4, figs. 1, la 52 



Trails of trilobites, coxopodites and 429 



Triarthrus bccki Green, compared 136, 137. J 40, 153 



described 135, 4", 4*3, 416, 417, 420, 422, 423 



development *43 



figured, pi. 30, figs. 1-15, 18 201 



figured, pi. 29, figs. 1-11; pi. 30, figs. 1-20; pi. 95, figs. 20-23; 



pi. 104, figs. 12-15 199=201, 439. 455 



text figs. 19, 19a 4ii 



fig. 21, D 421 



fig. 23 423 



Green, allied to Limulus 168 



appendages 117, 159, 160, 161, 162, 164, 165 



compared 167, 168, 171 



described 118, 121, 122, 124, 125 



Trichostemma sarsii Ridley and Dendy, compared 292 



Trilobita differentiated from Phyllopods and Ostracods 169 



relation to Branchiopoda and Malacostraca 168 



Ostracoda, Copepoda, Cirripedia 168 



