﻿Vol. 
  53.] 
  SIGULLAKIA 
  AND 
  GLOSSOPTERIS 
  IN 
  SOUTH 
  AFRICA. 
  

  

  333 
  

  

  on 
  the 
  grounds 
  of 
  very 
  slight 
  differences 
  in 
  form. 
  As 
  Schenk 
  l 
  has 
  

   pointed 
  out, 
  the 
  wide 
  margin 
  surrounding 
  the 
  central 
  oval 
  seed 
  is 
  

   the 
  impression 
  of 
  a 
  fleshy 
  seed-coat 
  and 
  not 
  a 
  membranous 
  wing, 
  

   as 
  many 
  authors 
  have 
  termed 
  it. 
  The 
  researches 
  of 
  Brongniart 
  2 
  

   and 
  Williamson 
  3 
  and 
  others 
  have 
  enabled 
  us 
  to 
  correlate 
  the 
  various 
  

   forms 
  presented 
  by 
  fossil 
  seed-impressions 
  and 
  casts 
  with 
  the 
  tissues 
  

   of 
  the 
  seed 
  and 
  seed-coat. 
  The 
  canal 
  at 
  the 
  base 
  of 
  the 
  seed 
  in 
  

   fig. 
  Id 
  no 
  doubt 
  marks 
  the 
  position 
  of 
  the 
  chalazal 
  vascular 
  bundle. 
  

  

  Fossil 
  of 
  doubtful 
  Affinity. 
  (PI. 
  XXI. 
  fig. 
  5.) 
  

  

  This 
  imperfect 
  leaf, 
  3-8 
  cm. 
  in 
  length 
  and 
  7 
  mm. 
  broad, 
  cannot 
  be 
  

   referred 
  with 
  certainty 
  to 
  a 
  particular 
  genus. 
  Its 
  convex 
  surface 
  is 
  

   traversed 
  by 
  a 
  number 
  of 
  parallel 
  veins 
  ; 
  at 
  the 
  apex 
  it 
  terminates 
  in 
  a 
  

   sharp, 
  narrow 
  point, 
  but 
  the 
  base 
  is 
  very 
  imperfectly 
  preserved. 
  The 
  

   form 
  of 
  the 
  leaf 
  suggests 
  a 
  comparison 
  with 
  the 
  incomplete 
  example 
  

   represented 
  in 
  PI. 
  XXI. 
  fig. 
  6. 
  A 
  leaf 
  such 
  as 
  this, 
  especially 
  if 
  

   imperfect, 
  might 
  belong 
  to 
  various 
  genera, 
  and 
  in 
  the 
  case 
  of 
  a 
  

   single 
  specimen 
  it 
  is 
  better 
  to 
  refrain 
  from 
  any 
  attempt 
  at 
  exact 
  

   identification. 
  It 
  may 
  be 
  compared 
  with 
  a 
  small 
  example 
  of 
  

   Cordaites, 
  C. 
  lancifolius, 
  Schmal., 
  figured 
  by 
  Schmalhausen 
  4 
  from 
  

   the 
  Permian 
  rocks 
  of 
  Russia. 
  On 
  the 
  other 
  hand, 
  certain 
  Cycadean 
  

   pinnse 
  or 
  the 
  broad 
  leaves 
  of 
  such 
  a 
  Conifer 
  as 
  Araucaria 
  or 
  Agathis 
  

   afford 
  close 
  parallels 
  with 
  this 
  type 
  of 
  leaf. 
  

  

  Locality. 
  Casey's 
  Township 
  (Francis). 
  

  

  The 
  following 
  table 
  shows 
  the 
  distribution 
  of 
  the 
  plants 
  in 
  

   Mr. 
  Draper's 
  collection 
  among 
  the 
  three 
  localities, 
  Francis 
  or 
  

   Casey's 
  Township, 
  Boschmans 
  Fontein 
  and 
  Maggies 
  Mine, 
  and 
  

   Yereeniging 
  : 
  — 
  

  

  

  Casey's 
  

   Township 
  

   (Francis). 
  

  

  Boschmans 
  

  

  Fontein 
  & 
  

  

  Maggies 
  

  

  Mine. 
  

  

  Vereeniging. 
  

  

  

  X 
  

   X 
  

   X 
  

   X 
  

   X 
  

   X 
  

  

  X 
  

   X 
  

  

  : 
  X 
  : 
  X 
  X 
  : 
  X 
  i 
  : 
  I 
  j 
  

  

  XXXXXX 
  XXXX 
  

  

  

  6r. 
  Browniana 
  var. 
  angustifolia 
  ... 
  

  

  

  Gangamopteris 
  cyclopteroides 
  

  

  ? 
  Equisetaceous 
  stem, 
  cf. 
  Calamites. 
  

  

  

  

  

  

  

  1 
  Zittel's 
  ' 
  Handbuch 
  der 
  Paliiontologie,' 
  pt. 
  ii. 
  p. 
  249 
  (Munich 
  & 
  Leipzig, 
  

   1890). 
  

  

  2 
  ' 
  Pecherches 
  sur 
  les 
  Graines 
  silicifiees,' 
  pi. 
  xiii. 
  fig. 
  1, 
  etc. 
  (Paris, 
  1881). 
  

  

  3 
  ' 
  Organ. 
  Foss. 
  Plants 
  Coal 
  Measures,' 
  pt. 
  viii., 
  Phil. 
  Trans, 
  vol. 
  clxvii. 
  (1877). 
  

  

  4 
  Schmalhausen, 
  Mem. 
  Com. 
  geol. 
  vol. 
  ii. 
  (1887) 
  No. 
  4, 
  pi. 
  vi. 
  fig. 
  2. 
  

  

  