492 SMITHSOIjTIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Syntrophia nundia, compared with Syntrophia cambria 107 



stratigraphic position and association 189, 191, 192 



Syntrophia primordialis, compared with Syntrophia unxia 108 



Syntrophia roiundata, compared with Syntrophia campbelli 108 



Syntrophia ? unxia, new species 108, pi. 10, fig. 10 



compared with Syntrophia barabuensis 108 



syntrophia primordialis ■ 108 



stratigraphic position and association 180 



Syntrophiidse, classification of 142 



defined 148 



diagram showing line of descent 140 



distribution in Cambrian strata 140 



mentioned '• • • • 109 



number of genera referred to the family 141 



Syringopora, stratigraphic position and association 200 



taconica, see Acrotreta so git talis. 



Teeth, defined I59 



Telson of Olenellus not a pygdium 246 



tennesseensis, see Linnarssonella. 



tessini, see Paradoxides. 



Teton Mountains, Wyoming, fossils in 63 



tetoncnsis, see Obolus. 



tetonensis leda, see Obolus. 



Texas, fresh-water origin of Algonkian sediments in 252 



texana, see Huenella, Lingulella, and Syntrophia. 



teXanus, see Crepicephalus. 



thompsoni, see Barrandia, Olenellus, and Paradoxides. 



thompsoni crassimarginatus, see Olenellus. 



Thorax of the Mesonacidse discussed 244-245 



thyone, see Eoorthis. 



Thysanota Alt., in synonymy 70 



Thysanotos, see Obolus (Thysanotos) . 



Thysanotus, see Obolus (Thysanotus). 



Timpahute Range, fossils from 286, 322, 345 



Tintic Range Section, Utah, fossils in 107 



Tollgate Canyon, fossils from 300 



Tomten, fossils from 290 



torelli, see Mesonacis and Schmidtia. 



transitans, see Pcedumias. 



Transmedian (Rotator) Muscles, defined 159 



Transverse axis, defined 159 



transversa, see Linnarssonella. 



Trapezoidal area, defined 159 



Trematobolus, classification of 142, 146 



compared with Dearbornia 79, 80 



evolution of pi. 11 (pp. 140-141) 



nature of shell substance '. 150 



