﻿430 
  Ortmann 
  — 
  Magellanian 
  Beds 
  of 
  Punta 
  Arenas. 
  

  

  A 
  remote 
  resemblance 
  exists 
  to 
  L. 
  undata 
  Phil. 
  (p. 
  164, 
  pi. 
  

   33, 
  f. 
  8-11), 
  from 
  Tubul 
  and 
  Lebii 
  (Navidad 
  beds), 
  but 
  our 
  

   species 
  is 
  very 
  much 
  shorter. 
  

  

  Patella 
  pygmaea 
  spec. 
  nov. 
  

  

  Magellanian 
  beds, 
  upper 
  part. 
  — 
  1 
  specimen. 
  

  

  Shell 
  subconical, 
  low, 
  outline 
  regularly 
  oval. 
  Apex 
  situated 
  

   in 
  the 
  anterior 
  half. 
  Surface 
  with 
  fine, 
  crowded, 
  a 
  little 
  un- 
  

   equal, 
  radial 
  ribs, 
  crossed 
  by 
  concentric 
  lines 
  of 
  growth, 
  and 
  

   finely 
  granulated. 
  L. 
  7'^'^\ 
  B. 
  5™°^, 
  H. 
  4°^"^. 
  

  

  The 
  position 
  of 
  this 
  species 
  may 
  be 
  with 
  the 
  genus 
  Acmaeay 
  

   as 
  the 
  thinness 
  of 
  the 
  shell 
  and 
  the 
  delicateness 
  of 
  the 
  ribs 
  sug- 
  

   gest. 
  At 
  any 
  rate, 
  it 
  is 
  the 
  first 
  Patelloid 
  shell 
  found 
  in 
  Ter- 
  

   tiary 
  deposits 
  of 
  Patagonia. 
  

  

  Troc/ncs 
  philijppii 
  spec. 
  nov. 
  

  

  Magellanian 
  beds, 
  upper 
  part. 
  — 
  2 
  specimens. 
  

  

  Shell 
  low, 
  conical, 
  not 
  umbilicated. 
  AYhorls 
  almost 
  flat, 
  only 
  

   very 
  slightly 
  convex. 
  Last 
  whorl 
  on 
  the 
  periphery 
  of 
  the 
  base 
  

   sharply 
  angular, 
  above 
  this 
  angular 
  ridge 
  there 
  are 
  4 
  revolving 
  

   ribs. 
  Lower 
  surface 
  slightly 
  convex, 
  with 
  5 
  strong, 
  revolving 
  

   ribs, 
  the 
  most 
  exterior 
  separated 
  from 
  peripheral 
  ridge 
  by 
  a 
  

   broad 
  space. 
  Pibs 
  of 
  the 
  lower 
  surface 
  with 
  regular, 
  strong 
  

   granules 
  ; 
  similar 
  granules 
  seem 
  to 
  have 
  been 
  present 
  on 
  the 
  

   upper 
  part 
  of 
  the 
  whorls. 
  H. 
  7"°", 
  diameter 
  at 
  the 
  base: 
  11°^™. 
  

  

  IJmbilical 
  region 
  closely 
  agreeing 
  with 
  T. 
  monilifer 
  Lmck. 
  

   from 
  the 
  Eocene 
  of 
  England 
  and 
  France, 
  also 
  the 
  sculpture 
  is 
  

   of 
  the 
  same 
  type. 
  But 
  T. 
  monilifer 
  is 
  much 
  higher, 
  and 
  the 
  

   number 
  of 
  the 
  revolving 
  ribs 
  is 
  different. 
  — 
  T. 
  macsporrani 
  and 
  

   T. 
  fricki 
  of 
  Philippi, 
  from 
  the 
  IS'avidad 
  beds, 
  are 
  related, 
  but 
  

   different. 
  

  

  Turritella 
  exigiia 
  spec. 
  nov. 
  

  

  Magellanian 
  beds, 
  lower 
  part. 
  — 
  Yery 
  abundant, 
  numerous 
  

   specimens. 
  

  

  Shell 
  small, 
  with 
  10 
  whorls, 
  ca. 
  4 
  times 
  as 
  high 
  as 
  broad 
  at 
  

   the 
  base. 
  Suture 
  deep, 
  whorls 
  convex, 
  with 
  5-7 
  spiral 
  ribs, 
  

   which 
  are 
  rather 
  crowded 
  and 
  often 
  alternately 
  stronger 
  and 
  

   weaker. 
  The 
  stronger 
  ribs 
  sometimes 
  appear 
  to 
  be 
  slightly 
  

   granulated. 
  H. 
  IS'"'", 
  D. 
  ca. 
  4"^"^. 
  

  

  Characterized 
  by 
  the 
  small 
  size, 
  and 
  convex 
  whorls. 
  The 
  

   two 
  small 
  species 
  of 
  Turritella 
  described 
  by 
  Philippi 
  from 
  the 
  

   Navidad 
  beds 
  (trilirata 
  and 
  parvula) 
  are 
  easily 
  distinguished 
  by 
  

   the 
  flat 
  whorls 
  and 
  small 
  number 
  of 
  ribs. 
  

  

  Trochita 
  mer'riarni 
  nom. 
  nov. 
  (= 
  T. 
  costellata 
  Philippi, 
  1. 
  

   c, 
  p. 
  93, 
  pi. 
  11, 
  f. 
  4, 
  1887, 
  and 
  Ortmann, 
  this 
  Journal, 
  December, 
  

   1898, 
  p. 
  480).-^- 
  

  

  * 
  Non 
  T. 
  costellata 
  Courad 
  (1855 
  Tacific 
  R. 
  R. 
  Rep., 
  v. 
  7, 
  p. 
  195, 
  pi. 
  7, 
  f. 
  3). 
  Mr. 
  

   J. 
  C. 
  Merriani 
  of 
  Berkely, 
  Cal. 
  hns 
  called 
  my 
  attention 
  to 
  the 
  fact, 
  that 
  the 
  specific 
  

   name 
  costellata 
  has 
  been 
  preoccupied 
  by 
  Conrad 
  for 
  a 
  species 
  from 
  the 
  Miocene 
  

   of 
  California. 
  

  

  