﻿Beecher 
  — 
  Natural 
  Classification 
  of 
  the 
  Trilobites. 
  207 
  

  

  Pseudophillipsia 
  Gemmellaro, 
  

  

  195 
  

   Pseudosphserexochus 
  Schmidt, 
  

  

  201 
  

   Psilocepbalus 
  Salter, 
  193 
  

  

  Pterocephalia 
  Roemer, 
  190 
  

  

  Pterygonietopus 
  Schmidt, 
  202 
  

   Ptychaspis 
  Hall, 
  190 
  

  

  Plychometopus 
  Schmidt, 
  200 
  

   Ptychoparia 
  Corda, 
  190 
  

  

  Ptychopyge 
  Angelin, 
  193 
  

  

  Raphiophorus 
  Angelin, 
  186 
  

  

  Remopleurides 
  Portlock, 
  190 
  

   Salteria 
  TFafcoft, 
  188 
  

  

  Salteria 
  TT. 
  Thompson, 
  186 
  

   Sao 
  Barrande, 
  190 
  

  

  Schmidtella 
  Tschemyschew, 
  195 
  

   Schmidtia 
  Marcou, 
  190 
  

  

  Seleuopeltis 
  Corda, 
  197 
  

  

  Shumardia 
  Billings, 
  182 
  

  

  Solenopleura 
  Angelin, 
  190 
  

  

  Sphserexochus 
  Beyrich, 
  201 
  

  

  Page. 
  

  

  Sphaerocoryphe 
  Angelin, 
  201 
  

  

  Sphaeropthalmus 
  Angelin, 
  190 
  

  

  Staurocephalus 
  Barrande, 
  201 
  

  

  Stygina 
  £ato-, 
  193 
  

  

  Symphoria 
  Clarke, 
  202 
  

  

  Syrnphysurus 
  Goldfuss, 
  193 
  

  

  Tele 
  ph 
  us 
  Barrande, 
  190 
  

  

  Terataspis 
  iZa#, 
  196 
  

  

  Thaleops 
  (Jonrad, 
  193 
  

  

  Toxotis 
  Wallerius, 
  188 
  

  

  Triarthrella 
  .flaft, 
  190 
  

  

  Triarthrus 
  Green, 
  190 
  

  

  Trimerocephalus 
  McCoy, 
  202 
  

  

  Trimerus 
  Green, 
  200 
  

  

  Trinucleus 
  Lhwyd, 
  186 
  

  

  Triopus 
  Barrande, 
  182 
  

  

  Trochurus 
  Beyrich, 
  196 
  

  

  Tropidocoryphe 
  Novak, 
  195 
  

  

  Uralichas 
  Delgado, 
  196 
  

  

  Xiphogomium 
  Corda, 
  195 
  

  

  Youngia 
  Lindstr'om, 
  201 
  

  

  Zacanthoides 
  TFa/co^, 
  190 
  

  

  Ereata. 
  

  

  Page 
  92, 
  line 
  19, 
  for 
  Zecanthoides 
  read 
  Zacanthoides. 
  

  

  Page 
  95, 
  line 
  24, 
  for 
  enervate 
  read 
  innervate. 
  

  

  Page 
  95, 
  line 
  25, 
  for 
  enervated 
  read 
  innervated. 
  

  

  Page 
  96, 
  lines 
  31 
  and 
  34, 
  for 
  enervating 
  read 
  innervating. 
  

  

  Page 
  103, 
  line 
  18, 
  for 
  Olenellus 
  read 
  Etliptocephala. 
  

  

  