INDEX 493 



PAGE 



Tonto, basal sandstone of Cambrian series 198 



Tontoia Walcolt, new genus discussed 198 



classification of IS4 



tentatively referred to Microdiscidje Koken 195 



mentioned IS5 



kwaguntensis Walcott, new species described 199 



figured, pi. 24, fig. 4 208 



toxeus, see Anomocarella and Ptychoparia (Liostracus). 

 transitans, see Nathorstia and Pcedeiimias. 



Trempealeau, Minnesota, Upper Cambrian locality Sz^ ZT^ 



Trenton, Oneida County, New York, drift block with fossils near 253 



Trenton Falls, Oneida County, New York, Potsdam sandstone 270 



Trenton limestone 190 



triangulata, see Hurdia. 



TriarthreUa auroralis Hall, listed from locality 113 360 



listed with St. Lawrence fauna 356 



Triarthrus becki, mentioned 190-191, 192 



sp. undt., listed in stratigraphic section 336 



Tribes Hill limestone, horizon of as indicated by Miller 255 



Trihlidiuni Lindstrom, genus named 263 



cornutaforme (Walcott), described 263 



figured, pi. 41, figs. 12-14 288 



in synonymy 263 



listed from Potsdam-Hoyt fauna 254 



tribulis, see Dikelocephalus. 



Trilobita, subclass, discussion of Neolenus and Ptychoparia 190 



beginning with Nevadia 157 



classification of 154 



compared with Limulava 20 



descent of 160-161 



different line of descent 164 



listed from Potsdam-Hoyt fauna 254 



possible form between Branchiopoda and Aglaspidae 163 



relation of Limulava to 22 



to Branchiopoda, Leptostaca, Malacostraca, and Meros- 



tomata 163 



segmentation, table of 158 



Sidneyia, relation to 206 



mentioned 148, 153, 155 



and Eurypterida, Sidneyia a transition form between 27 



Trilobites, associated with Eldonia ludwigi 50 



Trinucleus concentricus, mentioned 190 



Trochus, Matherella saratogensis previously referred to 264 



? saratogensis, from Hoyt quarry fauna 252 



tragus, see Anomocarella and Ptychoparia (Liostracus) . 



Trueman, J. M., specific name given in memory of 316 



truemani, see Olencllus. 



Tschang-hsing-tau Island, Liau-tung, Manchuria, China, Middle Cambrian 



localities 35n, 35r, 36d 74 



