﻿PELECYPOnA 
  

  

  101 
  

  

  Willett 
  (1931) 
  changed 
  the 
  previous 
  idea 
  rendered 
  by 
  Dall 
  (1900) 
  that 
  the 
  species 
  de- 
  

   scribed 
  by 
  Carpenter 
  was 
  the 
  young 
  of 
  P. 
  denticulata 
  Sowerby 
  (1834). 
  Willett 
  figured 
  

   specimens 
  of 
  both 
  species. 
  His 
  figures 
  justified 
  a 
  separation. 
  The 
  individuals 
  figured 
  by 
  

   Willett 
  (1931) 
  are 
  more 
  triangular 
  than 
  the 
  holotype. 
  Burch 
  in 
  commenting 
  on 
  Willett's 
  

   article 
  included 
  tracings 
  of 
  unidentified 
  specimens 
  in 
  the 
  Burch 
  collection 
  from 
  San 
  Martin 
  

   Island, 
  Mexico, 
  which 
  are 
  closer 
  in 
  appearance 
  to 
  the 
  shape 
  of 
  P. 
  tcllimyalis 
  than 
  are 
  those 
  

   of 
  Willett 
  or 
  Pilsbry 
  and 
  Lowe 
  (1932). 
  

  

  The 
  holotype 
  is 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  on 
  an 
  original 
  Carpenter 
  glass 
  mount 
  

   with 
  original 
  label, 
  consisting 
  of: 
  "Type 
  Psephis 
  tellimyalis, 
  Cpr. 
  California." 
  

  

  Carpenter 
  stated 
  originally 
  that 
  the 
  specimens 
  came 
  from 
  the 
  back 
  of 
  haliotids 
  (186Sg, 
  p. 
  

   135). 
  He 
  did 
  not 
  know 
  the 
  locality 
  and 
  suggested 
  Lower 
  California. 
  The 
  label 
  in 
  the 
  type 
  

   box 
  states 
  "San 
  Diego 
  Stearns 
  Coll." 
  That 
  label 
  is 
  subsequent 
  to 
  the 
  Carpenter 
  glass 
  mount, 
  

   however. 
  The 
  writer 
  does 
  not 
  believe 
  that 
  a 
  locality 
  other 
  than 
  California 
  would 
  be 
  authentic 
  

   for 
  the 
  original 
  specimens. 
  

  

  The 
  measurements 
  of 
  the 
  holotype 
  (2.5 
  mm.; 
  2 
  mm.) 
  correspond 
  to 
  the 
  dimensions 
  

   originally 
  stated 
  of 
  .09 
  poll 
  (2.27 
  mm.) 
  and 
  .07 
  poll 
  (1.77 
  mm.), 
  with 
  a 
  negligible 
  difference. 
  

  

  Holotype. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  15554 
  

  

  Distribution. 
  — 
  Recent. 
  California 
  (type) 
  ; 
  Santa 
  Monica, 
  California, 
  to 
  San 
  Martin, 
  

   Mexico 
  (Burch, 
  1945). 
  See 
  Table 
  2 
  for 
  stratigraphic 
  distribution. 
  

  

  Genus 
  Cooperella 
  Carpenter, 
  1864 
  

   (Oedalia 
  Carpenter, 
  1864; 
  Ocdalina 
  Carpenter, 
  1865) 
  

   Cooperella 
  Carpenter, 
  1864b, 
  p. 
  611 
  (first 
  mentioned), 
  p. 
  639 
  {Oedalia 
  Carpenter 
  not 
  Meigen, 
  

   1820) 
  ; 
  Carpenter, 
  1865, 
  California 
  Acad. 
  Sci., 
  Proc, 
  vol. 
  Ill, 
  p. 
  208, 
  Oedalina 
  and 
  

   Cooperella; 
  Dall, 
  1900. 
  Wagner 
  Free 
  Inst. 
  Sci. 
  Philadelphia, 
  Trans., 
  vol. 
  Ill, 
  pt. 
  V, 
  p. 
  

   1061; 
  Jukes-Browne, 
  1910, 
  Malacol. 
  Soc. 
  London, 
  Proc, 
  vol. 
  9, 
  p. 
  217, 
  221, 
  223, 
  224_ 
  

   Type 
  species 
  by 
  subsequent 
  designation, 
  Dall, 
  1900, 
  Wagner 
  Free 
  Inst. 
  Sci. 
  Philadelphia, 
  

   vol. 
  Ill, 
  pt. 
  V, 
  p. 
  1061, 
  Cooperella 
  suhdiaphana 
  Carpenter 
  (+ 
  scintillaejormis 
  Carpen- 
  

   ter), 
  1864b. 
  Recent. 
  Queen 
  Charlotte 
  Islands 
  to 
  Gulf 
  of 
  California. 
  (PI. 
  12, 
  figs. 
  6-16) 
  

  

  There 
  was 
  considerable 
  juggling 
  of 
  names 
  in 
  connection 
  with 
  this 
  genus, 
  so 
  that 
  even 
  

   though 
  C. 
  scintillaejormis 
  was 
  the 
  specific 
  name 
  used 
  in 
  the 
  first 
  mention 
  of 
  Cooperella, 
  the 
  

   name 
  was 
  a 
  nomen 
  nudum. 
  It 
  had 
  not 
  at 
  the 
  time 
  been 
  described. 
  It 
  was 
  also 
  the 
  specific 
  

   name 
  used 
  in 
  the 
  description 
  of 
  Cooperella. 
  Plowever, 
  C. 
  suhdiaphana 
  was 
  the 
  species 
  with 
  

   the 
  first 
  description 
  of 
  Oedalia, 
  the 
  description 
  which 
  precedes 
  that 
  of 
  Cooperella. 
  It 
  seems 
  

   best 
  to 
  maintain 
  the 
  designation 
  of 
  Dall, 
  using 
  the 
  name 
  C. 
  suhdiaphana 
  for 
  the 
  species 
  and 
  

   for 
  the 
  type 
  of 
  the 
  genus. 
  

  

  Besides 
  the 
  type 
  species, 
  a 
  West 
  Coast 
  Recent 
  and 
  Pleistocene 
  species, 
  the 
  genus 
  is 
  repre- 
  

   sented 
  by 
  one 
  species 
  from 
  the 
  upper 
  Miocene 
  (Yorktown) 
  of 
  Virginia 
  and 
  North 
  Carolina 
  

   (Dall, 
  1900, 
  p. 
  1063) 
  ; 
  Gardner 
  (1943, 
  p. 
  119) 
  and 
  a 
  species, 
  C. 
  atlantica 
  Rehder 
  (1943, 
  p. 
  

   187) 
  living 
  at 
  Peanut 
  Island, 
  Lake 
  Worth, 
  Florida. 
  

  

  Cooperella 
  suhdiaphana 
  (Carpenter) 
  

   (PI. 
  12, 
  figs. 
  6-16) 
  

  

  Oedalia 
  {Cooperella) 
  scintillaejormis 
  Carpenter, 
  1864b, 
  p. 
  611, 
  639; 
  Reprint, 
  1872, 
  p. 
  97, 
  

   125; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  Geol. 
  Sur. 
  California, 
  p. 
  6 
  Cooperella 
  

  

  Oedalia 
  suhdiaphana 
  Carpenter, 
  1864b, 
  p. 
  639; 
  Reprint, 
  1872, 
  p. 
  125; 
  1865, 
  Apr., 
  Jour, 
  de 
  

   Conchyl., 
  vol. 
  13, 
  p. 
  134; 
  Reprint, 
  1872, 
  p. 
  302 
  

  

  Oedalina 
  {Cooperella) 
  scintillaejormis 
  Carpenter, 
  1866, 
  California 
  Acad. 
  Sci., 
  Proc, 
  vol. 
  

   Ill, 
  p. 
  208; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  Geol. 
  Sur. 
  California, 
  p. 
  6 
  

  

  Cooperella 
  suhdiaphana 
  (+ 
  scintillijormis) 
  (Carpenter), 
  Dall, 
  1903, 
  Wagner 
  Free 
  Inst. 
  Sci. 
  

   Philadelphia, 
  Trans., 
  vol. 
  Ill, 
  pt. 
  V, 
  p. 
  1062; 
  Arnold, 
  1903, 
  p. 
  153, 
  pi. 
  XIII, 
  fig. 
  1 
  ; 
  Dall, 
  

   1921, 
  p. 
  45; 
  Oldrovd, 
  1924, 
  Pub. 
  Puget 
  Sound 
  Biol. 
  Station, 
  vol. 
  4, 
  p. 
  51 
  ; 
  1924b, 
  p. 
  163; 
  

   Keen, 
  1937, 
  p. 
  19; 
  Haas, 
  1942, 
  Nautilus, 
  vol. 
  55, 
  no. 
  4, 
  p. 
  110, 
  113; 
  Burch, 
  1944, 
  no. 
  42, 
  

   p. 
  20 
  ; 
  1945, 
  no. 
  45, 
  p. 
  16 
  ; 
  Smith 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  

   vol. 
  XXVI, 
  no. 
  8, 
  p. 
  175 
  

  

  "Oedalia 
  {Cooperella) 
  scintillaejormis, 
  n. 
  subg., 
  n.s. 
  S. 
  Diego, 
  Santa 
  Barbara 
  Is." 
  [Car- 
  

   penter, 
  1864b, 
  p. 
  611] 
  

  

  