SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Siam, California, fossils from 323 



Silver Peak quadrangle, fossils from 257, 260, 300, 315, 320, 323, 330 



Silver Peak Group, fossils from 296, 315, 320, 323, 330 



Siphonotrcta ? dubia, mentioned 300, 315 



Smithsburg, fossils from 340 



spinosus, see Paradoxides. 



St. Albans, fossils from 339 



St. Albans shales, mentioned 254 



St. Piran formation, fossils from 301, 319, 330, 331 



St. Simon, fossils from 339 



Stenoiheca cf. clongata, mentioned 300, 315 



Stenotheca riigosa, mentioned 300, 315, 341 



Stissing Mountain, fossils from 274 



Swanton, fossils from 339 



Swantonia ?, mentioned 300, 315 



weeksi, mentioned 300, 315 



taconica, see Acrotreta sagitfalis. 



Telson of Olcnellus not a pygidium 246 



tessini, see Paradoxides. 



Texas, fresh water origin of Algonkian sediments in 252 



thompsoni, see OlencUus. 



thompsoni crassimarginattis, see Olcnellus. 



Thorax of the Mesonacid?s discussed 244-245 



Timpahute Range, fossils from 286, 322, 345 



Tollgate Canyon, fossils from 300 



Tomten, fossils from 290 



torelli, see Mesonacis. 

 transitans, see Pcednniias. 



Trilobite, a mud-burrowing animal similar to Liinulus 241-242 



Trilobites, evolution of 256-257, 260 



eyes of compared with those of the Isopoda 240 



eyes of compared with those of Limulus 239 



Trinity Bay, fossils from 280 



Trois Pistoles, fossils from 339 



Troy, fossils from 274, 310 



troyensis, see Fordilla. 



Tumbyholm, fossils from 292 



varians, see Scenella. 



Vermilion Pass, fossils from 301 



vermilionensis, see Oholella. 



Vermont formation discussed 268-269 



vermontana, see Mesonacis. 



Vogdes, A. W., bibliographic reference 377 



Walcott, C. D., bibliographic references 377, 378 



on trilobites as a mud-burrowing animal similar to Limulus 241-242 



walcottanus, see Wanneria. 

 ivahotti, see Olcnellus. 



