﻿G. 
  B. 
  Wieland 
  — 
  On 
  Liassic 
  Floras. 
  267 
  

  

  Table 
  II. 
  — 
  Occurrence 
  of 
  Plants 
  in 
  the 
  Rio 
  Consuelo 
  Section.* 
  

  

  Lower 
  250 
  Meters. 
  

  

  Upper 
  300 
  Meters. 
  

  

  Anomozamites 
  cf. 
  Lindleyanus 
  (T.) 
  

   Otozamites 
  hespera. 
  

   Otozamites 
  hespera 
  var. 
  intermedins. 
  

   Otozamites 
  Mandelslohi. 
  

   Otozam 
  ites 
  Molinianus. 
  

   Otozamites 
  paratypus 
  (T.) 
  

   Otozamites 
  obtusus 
  var. 
  Liassicus 
  (T.) 
  

   Otozamites 
  obtusus 
  var. 
  oaxacense. 
  

   Otozamites 
  (Otopteris) 
  sp. 
  

   Otozamites 
  Reglei 
  (variety). 
  

   Otozamites 
  (Williamsonia) 
  tribulosus. 
  

   Pterophyllum 
  cf. 
  contiguum. 
  

   Pterozamites 
  {Pterophyllum) 
  angusti- 
  

  

  folia. 
  

   Stangerites 
  oaxacense. 
  

   Williamsonia 
  fructifications 
  : 
  

  

  W. 
  Huitzilopochtli 
  (M). 
  

  

  W. 
  Mexico 
  na. 
  

  

  W. 
  Tlazolteotl. 
  

  

  W. 
  Xipe 
  (M). 
  

  

  TV, 
  (species). 
  

   Zamites 
  confusus 
  [var.]. 
  

   Zamites 
  Rolkeri 
  (Puebla). 
  

   Araucarioxylon 
  mexicanu 
  m 
  . 
  

   Xoeggerathiopsis 
  Hislopi. 
  

   Trigonocarpus 
  oaxacense. 
  

   Rhabdocarpus 
  grandis. 
  

   Alethopteris 
  mexicana. 
  

   Laccopteris 
  (?). 
  

  

  Sggenopteris 
  rhoifolia 
  var. 
  mexicana. 
  

   Equisetites 
  (Catamites) 
  Giimbeli. 
  

  

  Cycadeospermum 
  oaxacense. 
  

   Oycadolepis 
  mexicana. 
  

   Otozamites 
  cardiopteriodes. 
  

   Otozamites 
  hespera 
  var. 
  latifolius. 
  

   Otozamites 
  Reglei 
  var. 
  lucerensis. 
  

   Otozamites 
  (Williamsonia) 
  Aguilari- 
  

  

  ana. 
  

   Otozamites 
  (Williamsonia) 
  Diazii. 
  

   Otozamites 
  (Williamsonia) 
  Juarezii. 
  

   Otozamites 
  ( 
  Williamsonia) 
  oaxacensis. 
  

   Ptilophyllum 
  acutifolium 
  var. 
  maxi- 
  

   mum. 
  

   Ptilophyllum 
  acutifolium 
  var. 
  minor. 
  

   Ptilophyllum 
  pulcherrima. 
  

   Pterophyllum 
  Miinsteri. 
  

   Williamsonia 
  fructifications 
  : 
  

  

  W. 
  Centeotl. 
  

  

  W. 
  Cuauhtemoc. 
  

  

  W. 
  Ipalnemoani. 
  

  

  W. 
  Nathoi'stii. 
  

  

  W. 
  Nezahualcoyotl. 
  

  

  W. 
  Quetzalcoatl. 
  

  

  W. 
  Texcatzoncatzl. 
  

  

  W. 
  Tlazolteotl. 
  

  

  W. 
  Xicotencatl. 
  

   (Williamsonian 
  stems). 
  

   Phcenicopsis 
  sp. 
  

   Yuccites 
  sch 
  imperianus. 
  

   Yuccites 
  schimperianus 
  var. 
  oaxa- 
  

   cense. 
  

   Cladophlebis 
  Albertsii. 
  

   Coniopteris 
  cf. 
  hymenophylliodes. 
  

   Dicksonia 
  (Sphenopteris) 
  cf. 
  bindra- 
  

  

  bunensis. 
  

   Glossopteris 
  linearis. 
  

   Glossopteris 
  mexicana. 
  

   Sphenopteris 
  cf. 
  williamsoni. 
  

   Tasniopterois 
  cf. 
  danceoides. 
  

   Tosniopteris 
  Zeilleri. 
  

   Equisetites 
  (Calamites) 
  Giimbeli. 
  

  

  Secondly, 
  the 
  distinctly 
  greater 
  proportion 
  of 
  cycads 
  in 
  the 
  

   initial 
  two-fifths 
  of 
  the 
  section 
  was 
  scarcely 
  to 
  have 
  been 
  

   expected. 
  But 
  notwithstanding 
  the 
  differences 
  noted, 
  there 
  is 
  

   a 
  general 
  unity 
  and 
  resemblance 
  in 
  the 
  two 
  series 
  of 
  plants. 
  

  

  The 
  most 
  important 
  fact 
  bro 
  light 
  out 
  by 
  grouping 
  the 
  plants 
  

   as 
  in 
  Table 
  II 
  is, 
  of 
  course, 
  this 
  greater 
  proportion 
  of 
  cycads 
  

   in 
  the 
  lower 
  half. 
  Taking 
  the 
  beds 
  as 
  a 
  whole, 
  they 
  contain 
  

   the 
  largest 
  cycadophytan 
  element 
  yet 
  reported, 
  and 
  the 
  fact 
  

  

  * 
  The. 
  only 
  species 
  arbitrarily 
  included 
  in 
  this 
  section 
  are 
  several 
  frond 
  

   types 
  from 
  the 
  Tlaxiaco 
  Eiver, 
  marked 
  T., 
  fruits 
  from 
  Eio 
  Mixtepec 
  (M.) 
  

   and 
  one 
  Puebla 
  species. 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series, 
  Vol. 
  XXXVI, 
  No. 
  213. 
  — 
  September, 
  1913. 
  

  

  18 
  

  

  