﻿Ortraann 
  — 
  Magellanian 
  Beds 
  of 
  Punta 
  Ai^enas. 
  431 
  

  

  Magellanian 
  beds, 
  upper 
  part, 
  1 
  specimen. 
  — 
  Lower 
  part, 
  2 
  

   specimens. 
  

  

  Characterized 
  by 
  the 
  fine 
  radial 
  striae 
  of 
  the 
  shell. 
  

  

  Kecorded 
  from 
  Lebii, 
  ^avidad 
  beds. 
  

  

  Natica 
  chiloensis 
  Phil. 
  (1. 
  c, 
  p. 
  89, 
  pi. 
  10, 
  f. 
  12). 
  

  

  Magellanian 
  beds, 
  upper 
  part, 
  2 
  poor 
  specimens. 
  — 
  Lower 
  

   part, 
  abundant, 
  many 
  specimens. 
  

  

  This 
  species 
  is 
  to 
  be 
  recognized 
  by 
  the 
  thick 
  and 
  solid 
  shell 
  

   of 
  a 
  more 
  or 
  less 
  ovate 
  sha[>e, 
  with 
  thick 
  callus 
  of 
  the 
  inner 
  lip, 
  

   which 
  leaves 
  a 
  small, 
  narrow 
  slit 
  open 
  at 
  the 
  umbilicus. 
  

  

  Kecorded 
  from, 
  the 
  island 
  of 
  Chiloe, 
  Navidad 
  beds. 
  

  

  Struihiolaricb 
  hatcheri 
  spec. 
  nov. 
  

  

  Magellanian 
  beds, 
  lower 
  part. 
  — 
  8 
  specimens. 
  

  

  Closely 
  allied 
  to 
  S. 
  ornata 
  var. 
  densestriata 
  v, 
  Ihering 
  (Rev. 
  

   Mus. 
  Paalista, 
  v. 
  2, 
  1897, 
  p. 
  292, 
  f. 
  15) 
  from 
  the 
  Patagonian 
  

   beds. 
  S. 
  densestriata 
  and 
  the 
  present 
  form 
  possess 
  on 
  the 
  lower 
  

   part 
  of 
  the 
  last 
  whorl 
  a 
  number 
  of 
  revolving 
  ribs 
  of 
  equal 
  

   strength, 
  in 
  which 
  character 
  both 
  differ 
  from 
  S. 
  ornata 
  Sow. 
  

   In 
  S. 
  hatcheri, 
  however, 
  the 
  number 
  of 
  the 
  ribs 
  of 
  the 
  last 
  

   whorl 
  is 
  much 
  higher, 
  20-22, 
  than 
  in 
  S. 
  densestriata 
  (13) 
  ; 
  14- 
  

   15 
  of 
  these 
  ribs 
  are 
  placed 
  below 
  the 
  series 
  of 
  nodules 
  found 
  in 
  

   the 
  upper 
  part 
  of 
  the 
  whorl, 
  Further, 
  8. 
  hatcheri 
  is 
  distin- 
  

   guished 
  from 
  the 
  other 
  form 
  by 
  the 
  suture, 
  which 
  is 
  not 
  channel- 
  

   like, 
  as 
  in 
  densestriata, 
  but 
  simply 
  rectangular. 
  By 
  this 
  charac- 
  

   ter 
  it 
  approaches 
  S. 
  chilensis 
  Phil. 
  (= 
  ameghinoi 
  v. 
  Ih.), 
  but 
  

   in 
  the 
  latter 
  species 
  the 
  suture 
  is 
  still 
  less 
  deep. 
  H. 
  22™°^, 
  

   D. 
  13""^ 
  

  

  Actaeon 
  chilensis 
  Yh\\. 
  (1. 
  c, 
  p. 
  Ill, 
  pi. 
  13, 
  f. 
  16). 
  

  

  Magellanian 
  beds, 
  lower 
  part. 
  — 
  1 
  specimen. 
  

  

  Agrees 
  well 
  with 
  Philippi's 
  species. 
  

  

  Recorded 
  from 
  Navidad 
  and 
  Matanzas. 
  

  

  Bulla 
  remondi 
  Phil. 
  (1. 
  c, 
  p. 
  109, 
  pi. 
  13, 
  f. 
  7). 
  

  

  Magellanian 
  beds, 
  lower 
  part. 
  — 
  6 
  specimens. 
  

  

  The 
  figure 
  of 
  Philippi 
  does 
  not 
  agree 
  with 
  the 
  measurements 
  

   given 
  in 
  the 
  text, 
  the 
  latter 
  being 
  almost 
  identical 
  with 
  those 
  

   of 
  Sowerby's 
  B. 
  cosmophila. 
  

  

  Our 
  specimens 
  agree 
  with 
  \X\q 
  figure 
  of 
  Philippi. 
  The 
  meas- 
  

   urements 
  are 
  : 
  H. 
  13"^^, 
  D. 
  5'""^, 
  relation, 
  1 
  : 
  2, 
  6 
  (Philippi's 
  

   figure 
  : 
  H. 
  21, 
  D. 
  8, 
  rel. 
  1 
  : 
  2, 
  6 
  ; 
  Philippi's 
  text 
  : 
  H. 
  19, 
  D. 
  9, 
  

   rel. 
  1: 
  2, 
  1; 
  Sowerby's 
  cosmophila: 
  H. 
  21, 
  D. 
  11, 
  rel. 
  1: 
  

   2,2). 
  

  

  Recorded 
  from 
  the 
  Navidad 
  beds 
  of 
  Chile, 
  and 
  doubtfully 
  

   (see 
  Moericke, 
  iS". 
  Jahrb. 
  Min. 
  etc., 
  Beil. 
  10, 
  1896, 
  p. 
  591), 
  from 
  

   the 
  Cretaceous 
  beds 
  of 
  Chile. 
  

  

  In 
  conclusion 
  I 
  should 
  like 
  to 
  make 
  a 
  few 
  further 
  remarks 
  

   on 
  the 
  Punta 
  Arenas 
  section. 
  This 
  section 
  has 
  been 
  mentioned 
  

  

  