INDEX 487 



PAGE 

 Redlichclla, see Acrothele {Redlichclla) . 



Redlichia, a descendant of the Mesonacidne 253, 254 



Reed, F. R. C, bibliographic reference 218 



remnicha, see Eoorthis and Orthis. 

 remnicha zmnfieldensis, see Eoorthis. 



Rensselaer County, New York, fossils from 274 



Resting (Fresh Water) Springs, fossils from 187, 300, 323 



reticulatus, see Olcnellus. 



Retractor muscles, defined 154, 158 



rex, see Agnostus. 



Reynolds Inn, fossils from 274 



reynoldsi, see Oryctocephahis. 



Rhea Springs, fossils from 340 



Ringsaker, Norway, fossils at 83 



Roan Iron Mine, fossils from 340 



Rocky Mountain region, fresh-water origin of Algonkian sediments in. .. . 252 



Roddy. H. Justin, acknowledgments 234 



mentioned 304 



Roemer, F., bibliographic reference 114 



Rogersville shale, Tennessee, fossils in g6 



Rohrerstown, fossils from 304, 310, 340 



Rome sandstone, fossils from 310 



Rominger, C, bibliographic reference 218 



romingeri, see Corynexochtis and Platyceras. 



Rotator muscles, defined 159 



rotundata, see Syntrophia. 



rotimdatus, see Bathyiiriscus and Obolus. 



rozvei, see Holmia and LinguleUa (Lingulepis) . 



rudis, see Acrotreta. 



rugosa, see Stenotheca. 



Russia, thin sections of fossils from 164, 165 



Rust, William P., acknowledgments 235 



Rustella, classification of 142, 143 



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



nature of shell substance 149-150 



Rustella edsoni, compared with Dearborni clarki 79 



Rustellacea, classification 142 



defined 143 



Rustellidas, classification of 142 



defined 143 



diagram showing line of descent 140 



distribution in Cambrian strata 140 



Saddle Mountain, Lower Cambrian conglomerate on 423 



sagittalis, see Acrotreta. 

 sagittalis taconica, see Acrotreta. 



St. Albans, fossils from 339 



St. Albans shales, mentioned 254 



