﻿338 
  ME. 
  A. 
  C. 
  SEWAKD 
  ON 
  THE 
  ASSOCIATION 
  OF 
  [Aug. 
  1 
  897, 
  

  

  overlapped 
  in 
  South 
  America, 
  and 
  the 
  same 
  may 
  now 
  be 
  asserted 
  as 
  

   regards 
  a 
  certain 
  area 
  of 
  South 
  Africa. 
  

  

  There 
  can 
  be 
  no 
  doubt 
  that 
  the 
  whole 
  problem 
  connected 
  with 
  

   the 
  geography 
  and 
  plant-distribution 
  in 
  the 
  Southern 
  Hemisphere 
  at 
  

   the 
  close 
  of 
  the 
  Palaeozoic 
  and 
  at 
  the 
  beginning 
  of 
  the 
  Mesozoic 
  Era 
  

   is 
  well 
  worthy 
  of 
  careful 
  consideration. 
  Our 
  knowledge 
  of 
  the 
  

   paleobotany 
  of 
  Gondwanaland 
  is 
  still 
  far 
  too 
  fragmentary 
  and 
  

   imperfect 
  to 
  admit 
  of 
  very 
  definite 
  and 
  far-reaching 
  conclusions, 
  but 
  

   such 
  data 
  as 
  we 
  already 
  possess 
  are 
  in 
  need 
  of 
  a 
  thorough 
  and 
  

   comparative 
  study. 
  A 
  superficial 
  acquaintance 
  with 
  the 
  scattered 
  

   literature 
  of 
  Southern 
  Hemisphere 
  fossil 
  botany 
  suffices 
  to 
  show 
  

   the 
  need 
  of 
  a 
  general 
  survey 
  of 
  the 
  plant 
  records 
  undertaken 
  from 
  

   a 
  botanical 
  point 
  of 
  view, 
  in 
  order 
  to 
  afford 
  the 
  geologist 
  a 
  more 
  

   trustworthy 
  contribution 
  which 
  may 
  aid 
  towards 
  the 
  solution 
  of 
  

   important 
  geological 
  and 
  botanical 
  questions. 
  

  

  EXPLANATION 
  OF 
  PLATES. 
  

  

  (The 
  photographs 
  from 
  which 
  the 
  figures 
  have 
  been 
  reproduced 
  were 
  taken 
  

   by 
  Mr. 
  Edwin 
  Wilson, 
  Cambridge. 
  The 
  figures 
  are 
  slightly 
  less 
  than 
  natural 
  

   size, 
  except 
  where 
  otherwise 
  stated.) 
  

  

  All 
  the 
  specimens, 
  with 
  the 
  exception 
  of 
  that 
  figured 
  in 
  PI. 
  XXIII. 
  fig. 
  1, 
  

   are 
  in 
  the 
  British 
  Museum 
  (Natural 
  History). 
  

  

  Plate 
  XXI. 
  

  

  Pig. 
  1. 
  Glossopteris 
  Browniana, 
  Brongn., 
  p. 
  320. 
  

  

  2. 
  ,. 
  „ 
  var. 
  indica, 
  p. 
  320. 
  

  

  3. 
  „ 
  „ 
  „ 
  „ 
  p. 
  321. 
  

  

  4 
  a. 
  „ 
  ,, 
  var. 
  angustifolia, 
  p. 
  321. 
  

  

  4 
  b. 
  Nceggerathiopsis 
  Hislopi 
  (Bunb.), 
  p. 
  322. 
  

  

  5. 
  Leaf 
  of 
  doubtful 
  affinity, 
  p. 
  333. 
  

  

  6. 
  Fragments 
  of 
  Globsopteris-leayes, 
  g, 
  g' 
  , 
  and 
  one 
  of 
  ? 
  Naggerathiopsis, 
  a, 
  

  

  Plate 
  XXII. 
  

  

  Fig. 
  1. 
  Gangamopteris 
  cyclopteroides, 
  Feistm., 
  p. 
  323. 
  

  

  2. 
  Conitessp., 
  p. 
  331. 
  

  

  3. 
  Sigillaria 
  cf. 
  S. 
  Brardi, 
  Brongn., 
  p. 
  326. 
  

  

  4 
  a, 
  ? 
  Sigillaria 
  sp., 
  p. 
  330. 
  ~| 
  

  

  4 
  b. 
  Equisetaceous 
  stem, 
  p. 
  325. 
  I 
  Bather 
  less 
  than 
  | 
  nat. 
  size. 
  

  

  4 
  c. 
  Glossopteris 
  Browniana, 
  Brongn., 
  p. 
  331. 
  J 
  

  

  Plate 
  XXIII. 
  

  

  Fig. 
  1. 
  Glossopteris 
  Browniana, 
  Brongn., 
  New 
  South 
  Wales, 
  p. 
  318. 
  

   2. 
  Sigillaria 
  Brardi, 
  Brongn., 
  p. 
  326. 
  

  

  Plate 
  XXIV. 
  

  

  Fig. 
  1. 
  Phyllotheca 
  sp., 
  p. 
  324. 
  

  

  2. 
  Calamitean 
  (?) 
  stem, 
  p. 
  326. 
  

  

  3. 
  ? 
  Sigillaria 
  sp., 
  p. 
  330. 
  

  

  