﻿PELECYPODA 
  

  

  83 
  

  

  The 
  tj'pes 
  have 
  a 
  well-impressed 
  lunule 
  and 
  escutcheon. 
  There 
  are 
  a 
  ix)sterior 
  and 
  an 
  an- 
  

   terior 
  lateral 
  in 
  the 
  right 
  valve 
  and 
  a 
  central 
  and 
  posterior 
  cardinal. 
  

  

  Syntypcs.—U. 
  S. 
  National 
  Museum, 
  No. 
  15681 
  ("California 
  State 
  Coll. 
  403") 
  

   Distribution. 
  — 
  Recent. 
  Monterey, 
  California 
  (type) 
  ; 
  Queen 
  Charlotte 
  Islands 
  to 
  Todos 
  

   Santos 
  Bay, 
  Lower 
  California 
  (Dall). 
  Pleistocene. 
  California 
  (Grant 
  and 
  Gale, 
  1931; 
  Ar- 
  

   nold, 
  1903; 
  Chace 
  and 
  Chace, 
  1919) 
  Mexico 
  (Jordan, 
  1926). 
  Pliocene 
  (Woodring 
  and 
  

   Bramlette, 
  1950) 
  

  

  Genus 
  Miodontiscus 
  Dall, 
  1903 
  

  

  lifiodon 
  Carpenter, 
  1864b, 
  Aug., 
  p. 
  611, 
  627, 
  642; 
  Reprint, 
  1872, 
  p. 
  97, 
  113, 
  128; 
  1864d, 
  Dec, 
  

   Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  3, 
  vol. 
  XIV, 
  p. 
  424; 
  Reprint, 
  1872, 
  p. 
  236; 
  Dall, 
  1903 
  (page 
  

   date 
  1902), 
  Acad. 
  Nat. 
  Sci. 
  Philadelphia, 
  Proc., 
  vol. 
  54, 
  pt. 
  4, 
  p. 
  700, 
  711. 
  Not 
  Miodon 
  

   DuMERiL, 
  1859, 
  or 
  Miodon 
  Sandberger, 
  1871 
  (see 
  Neave, 
  1939-40) 
  

  

  Miodontisnis 
  Dall, 
  1903, 
  April, 
  Nautilus, 
  vol. 
  16, 
  no. 
  12, 
  p. 
  143; 
  1903, 
  Oct., 
  Wagner 
  Free 
  

   Inst. 
  Sci. 
  Philadelphia, 
  Trans., 
  vol. 
  Ill, 
  pt. 
  VI, 
  p. 
  1417, 
  substitute 
  name 
  for 
  Miodon 
  Car- 
  

   penter; 
  Chavan, 
  1937, 
  C.R.S. 
  Soc. 
  Geol. 
  France, 
  no. 
  10, 
  p. 
  122 
  

  

  Type 
  species 
  by 
  original 
  designation-''^ 
  M. 
  prolongatus 
  Carpenter 
  (1864b, 
  p. 
  627). 
  Recent. 
  

  

  West 
  Coast 
  United 
  States, 
  Alaska, 
  to 
  San 
  Diego, 
  California 
  (PI. 
  8, 
  figs. 
  1-7) 
  

  

  Miodontiscus 
  prolongatus 
  (Carpenter) 
  

  

  (PI. 
  8, 
  figs. 
  1-7) 
  

  

  Miodon 
  prolongatus 
  Carpenter, 
  1864b, 
  Aug., 
  p. 
  611, 
  627, 
  642, 
  682; 
  Reprint, 
  1872, 
  p. 
  97, 
  113, 
  

  

  128, 
  168; 
  1864, 
  Dec, 
  Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  3, 
  vol. 
  XIV, 
  p. 
  424; 
  Reprint, 
  1872, 
  p. 
  236: 
  

  

  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Geol. 
  Sur. 
  California, 
  p. 
  9; 
  Stearns, 
  1891, 
  U. 
  S. 
  Nat. 
  Mus., 
  

  

  Proc, 
  vol. 
  13, 
  p. 
  217, 
  pi. 
  16, 
  figs. 
  7, 
  9 
  hinge 
  of 
  fig. 
  7 
  not 
  accurate 
  

   J'cncricardia 
  (Miodon) 
  prolongatus 
  (Carpenter), 
  Dall, 
  1903 
  (page 
  date 
  1902), 
  Acad. 
  Nat. 
  

  

  Sci. 
  Philadelphia, 
  Proc, 
  vol. 
  54, 
  pt. 
  4, 
  p. 
  700, 
  711 
  

   l\'ucricardia 
  (Miodontiscus) 
  prolongatus 
  (Carpenter), 
  Dall, 
  1921, 
  p. 
  32; 
  Oldroyd, 
  1924b, 
  

  

  p. 
  115, 
  pi. 
  2, 
  figs. 
  5, 
  6; 
  1924, 
  Pub. 
  Puget 
  Sound 
  Biol. 
  Station, 
  vol. 
  4, 
  p. 
  36, 
  pi. 
  16, 
  figs. 
  5, 
  

  

  6 
  

   Cardita 
  (Miodontiscus) 
  prolongata 
  (Carpenter), 
  Grant 
  and 
  Gale, 
  1931, 
  p. 
  276 
  

   Cardita 
  prolongata 
  Carpenter, 
  Keen, 
  1937, 
  p. 
  19; 
  Smith 
  and 
  (jOrdon, 
  1948, 
  California 
  

  

  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  XXVI, 
  no. 
  8, 
  p. 
  172 
  

   Miodontiscus 
  prolonqatus 
  (Carpenter), 
  Chavan, 
  1937, 
  C.R.S. 
  Soc 
  Geol. 
  France, 
  no. 
  10, 
  

  

  p. 
  122; 
  BuRCH, 
  1944, 
  no. 
  39, 
  p. 
  17; 
  1945, 
  no. 
  45, 
  p. 
  11 
  

  

  "Miodon 
  prolongatus. 
  (Neeah 
  Baj', 
  Szvan.) 
  Identified 
  from 
  tracing 
  only." 
  [Carpenter, 
  

   1864b, 
  p. 
  611] 
  

  

  "Miodon 
  prolongatus, 
  n. 
  subg., 
  n.s. 
  Several 
  valves 
  of 
  this 
  curious 
  shell, 
  intermediate 
  be- 
  

   tween 
  Lucina 
  and 
  Vencricardia, 
  accord 
  with 
  forms 
  not 
  before 
  eliminated, 
  from 
  the 
  Coralline 
  

   Crag 
  and 
  Inferior 
  Oolite." 
  [Carpenter, 
  1864b, 
  p. 
  627] 
  

  

  "Miodon 
  prolongatus, 
  n.g., 
  n.s. 
  Outside 
  Lucinoid 
  ; 
  hinge 
  and 
  scars 
  nearer 
  to 
  Vencricardia. 
  

   Congeneric 
  with 
  Astartc 
  orbicularis, 
  J. 
  Sby. 
  Min. 
  Conch, 
  pi. 
  444. 
  f. 
  2, 
  3 
  (non 
  ejusdem, 
  pi. 
  520, 
  

   f. 
  2). 
  G. 
  Oolite; 
  and 
  with 
  the 
  Crag 
  Cardita 
  corbis." 
  [Carpenter, 
  1864b, 
  p. 
  642] 
  

  

  A 
  copy 
  of 
  the 
  description 
  (Carpenter, 
  1864d) 
  has 
  been 
  published 
  by 
  Oldroyd. 
  The 
  follow- 
  

   ing 
  should 
  be 
  added 
  to 
  complete 
  that 
  copy: 
  "Long. 
  .23, 
  lat. 
  .24, 
  alt. 
  .16." 
  

  

  Four 
  specimens 
  at 
  the 
  Redpath 
  Museum 
  are 
  labelled 
  "type" 
  in 
  Carpenter's 
  handwriting, 
  

   and 
  they 
  are 
  on 
  Carpenter's 
  original 
  mount. 
  There 
  are 
  also 
  five 
  specimens 
  in 
  the 
  U. 
  S. 
  Na- 
  

   tional 
  Museum, 
  no. 
  15472^1, 
  also 
  labelled 
  "type" 
  by 
  Carpenter. 
  Both 
  suites 
  have 
  the 
  label 
  

   "Neeah 
  Bay 
  Swan." 
  The 
  writer 
  retains 
  all 
  the 
  types 
  as 
  syntypes 
  and 
  therefore 
  leaves 
  a 
  lecto- 
  

   type 
  designation 
  open 
  in 
  case 
  the 
  species 
  is 
  later 
  thoroughly 
  studied. 
  It 
  may 
  then 
  seem 
  desir- 
  

  

  30 
  The 
  writer 
  considers 
  the 
  use 
  of 
  "n. 
  subg. 
  n.s." 
  (Carpenter, 
  1864b, 
  p. 
  627) 
  as 
  an 
  original 
  

   designation 
  of 
  type 
  species 
  (Opin. 
  7, 
  Int. 
  Rules 
  Zool. 
  Nomen.) 
  rather 
  than 
  the 
  type 
  desig- 
  

   nated 
  by 
  monotypy, 
  since 
  Carpenter 
  did 
  bring 
  into 
  his 
  discussion 
  a 
  second 
  species. 
  Either 
  

   method 
  of 
  type 
  designation 
  produces 
  in 
  this 
  case 
  the 
  same 
  type 
  species 
  for 
  the 
  genus. 
  

  

  3iStearns, 
  (1891, 
  p. 
  217) 
  meant 
  this 
  number, 
  but 
  the 
  figures 
  were 
  transposed 
  in 
  printing 
  

   to 
  15742. 
  

  

  