﻿AMPTTINEURA 
  281 
  

  

  Dimensions.— 
  Long. 
  22.77 
  mm.; 
  lat. 
  12.65 
  mm.; 
  alt. 
  5.06 
  mm. 
  (holutype) 
  ; 
  original 
  

   dimensions 
  of 
  Carpenter 
  converted 
  into 
  mm. 
  

  

  Types. 
  — 
  Holotype, 
  British 
  Museum 
  (Natural 
  History), 
  61.5.20.103, 
  "Chiton 
  incisus" 
  

   Nuttall 
  ms. 
  = 
  C. 
  acutus 
  Cpr. 
  ; 
  holotype 
  of 
  M. 
  plumosa 
  Carpenter 
  in 
  Pilsbry, 
  Geology 
  De- 
  

   partment, 
  Cornell 
  University, 
  no. 
  25530; 
  holotype 
  of 
  M. 
  "filosa" 
  Carpenter 
  ms. 
  = 
  M. 
  fissa 
  

   Carpenter 
  in 
  Pilsbry, 
  Redpath 
  Museum, 
  no. 
  9 
  

  

  Distribution.— 
  Recent. 
  San 
  Diego, 
  California 
  (type) 
  ; 
  Santa 
  Barbara 
  to 
  San 
  Diego, 
  Cali- 
  

   fornia 
  (Dall). 
  Pleistocene. 
  California 
  (Berry) 
  

  

  Mopalia 
  imporcata 
  Carpenter 
  

   (PI. 
  32, 
  fig. 
  2) 
  

  

  Mopalia 
  imporcata 
  Carpenter, 
  1864b, 
  p. 
  603, 
  648 
  genus 
  ?; 
  Reprint, 
  1872, 
  p. 
  89, 
  134; 
  1865, 
  

  

  Acad. 
  Nat. 
  Sci. 
  Philadelphia, 
  Proc, 
  vol. 
  17, 
  p. 
  59; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  Geol. 
  

  

  Sur. 
  California, 
  p. 
  22; 
  Pilsbry, 
  1892, 
  Man. 
  Conch., 
  vol. 
  XIV, 
  p. 
  301, 
  pi. 
  62, 
  fig. 
  98; 
  

  

  1896, 
  Nautilus, 
  vol. 
  10, 
  no. 
  5, 
  p. 
  49; 
  Dall, 
  1921, 
  p. 
  196; 
  Berry, 
  1917, 
  California 
  Acad. 
  

  

  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  VII, 
  no. 
  10, 
  p. 
  241; 
  Oldroyd, 
  1927, 
  vol. 
  II, 
  pt. 
  Ill, 
  p. 
  308; 
  

  

  BuRCH, 
  1947, 
  no. 
  66, 
  p. 
  19; 
  Smitfi 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  

  

  4, 
  vol. 
  XXVI, 
  p. 
  206 
  

   Placiphorella 
  imporcata 
  (Carpenter), 
  Dall, 
  1879, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  vol. 
  1, 
  p. 
  306 
  

   Osteochiton 
  imporcatus 
  (Carpenter), 
  Dall, 
  1887, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  1886, 
  vol. 
  9, 
  p. 
  211 
  

  

  "Pale 
  : 
  central 
  area 
  ribbed 
  : 
  post, 
  valve 
  slightly 
  notched. 
  Indications 
  of 
  sutural 
  pores 
  in 
  

   these 
  two 
  species, 
  if 
  confirmed, 
  will 
  require 
  a 
  new 
  genus." 
  [Carpenter, 
  1864b, 
  p. 
  648] 
  

  

  "? 
  M. 
  t. 
  parva, 
  valde 
  elevata, 
  satis 
  elongata 
  ; 
  jugo 
  acuto, 
  rectangulato 
  ; 
  pallida, 
  rufotincta 
  ; 
  

   areis 
  lateralibus 
  costa 
  elevata, 
  dense 
  granulosa, 
  definitis 
  ; 
  suturis 
  dense 
  granosis, 
  marginibus 
  

   intus 
  implicatis 
  ; 
  valva 
  antica 
  circiter 
  octies 
  granoso-costata 
  ; 
  arearum 
  lateralium 
  et 
  valvae 
  an- 
  

   ticae 
  interstitiis 
  intricatim 
  ruguloso-indentatis 
  ; 
  areis 
  centralibus 
  costis 
  longitudinalibus 
  crebis, 
  

   validissimis, 
  acutis, 
  subparallelis, 
  interstitiis 
  crenulato-decussatis 
  ; 
  valva 
  postica 
  mucrone 
  hand 
  

   conspicuo, 
  submarginali, 
  sinu 
  parvo, 
  angusto 
  : 
  intus, 
  sinu 
  laminarum 
  suturalium 
  angusto 
  : 
  

   valvis 
  centralibus 
  fissura 
  una; 
  valva 
  antica 
  fissuris 
  ? 
  — 
  ; 
  valva 
  postica 
  fissura 
  utraque 
  una, 
  

   postice 
  sinu 
  parvo, 
  angulato 
  : 
  limbo 
  coriaceo, 
  poris 
  suturalibus 
  aliisque 
  hue 
  et 
  illuc 
  sparsis, 
  

   minutis, 
  setulis 
  albidis 
  instructis. 
  

  

  "Hab. 
  — 
  In 
  sinu 
  Pugetiano 
  specimina 
  duo 
  legit 
  Kennerley. 
  

  

  "Ut 
  in 
  ? 
  M. 
  sinuata, 
  a 
  Mopaliis 
  typicis 
  different." 
  [Carpenter, 
  1865e, 
  p. 
  59] 
  

  

  Pilsbry 
  stated 
  that 
  his 
  description 
  and 
  figures 
  were 
  drawn 
  from 
  Carpenter's 
  type 
  in 
  the 
  

   U. 
  S. 
  National 
  Museum. 
  There 
  is 
  also 
  a 
  specimen 
  (plates 
  separated) 
  in 
  the 
  Carpenter 
  

   Collection 
  in 
  the 
  Redpath 
  Museum 
  on 
  an 
  original 
  Carpenter 
  glass 
  mount 
  with 
  Carpenter's 
  

   label. 
  "Placiphorella 
  imporcata 
  Cpr 
  type 
  Puget 
  Sd. 
  Kennerley." 
  

  

  Syntypes. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  4499; 
  Redpath 
  Museum, 
  no. 
  57 
  

   Distribution. 
  — 
  Puget 
  Sound, 
  Washington 
  (type) 
  ; 
  Forrester 
  Island, 
  Alaska, 
  to 
  San 
  Pedro, 
  

   California 
  (Dall) 
  

  

  Mopalia 
  lignosa 
  (Gould) 
  

   (PL 
  27, 
  fig. 
  12) 
  

  

  Chiton 
  lignosus 
  Gould, 
  1846, 
  July, 
  Boston 
  Soc. 
  Nat. 
  Hist., 
  Proc, 
  vol. 
  II, 
  p. 
  142 
  (see 
  Otia, 
  

   p. 
  100 
  for 
  date) 
  ; 
  1862, 
  Otia 
  Conch., 
  p. 
  3 
  

  

  Chiton 
  merckii 
  Middendorff, 
  1847, 
  April, 
  Imp. 
  Acad. 
  Sci. 
  St. 
  Petersburg, 
  Bull., 
  vol. 
  VI, 
  

   p. 
  20, 
  fide 
  G. 
  L. 
  Wilkins 
  

  

  Mopalia 
  simpsonii 
  Gray, 
  1847, 
  May, 
  Zool. 
  Soc. 
  London, 
  Proc, 
  p. 
  69 
  

  

  Chiton 
  monterevensis 
  Carpenter, 
  1855, 
  Zool. 
  Soc. 
  London, 
  Proc, 
  pt. 
  XXIII, 
  p. 
  231 
  ; 
  1856, 
  

   Kept. 
  British 
  Assoc. 
  Adv. 
  Sci. 
  1855. 
  p. 
  318, 
  349; 
  1860, 
  Smith. 
  Misc 
  Coll.. 
  vol. 
  2, 
  art. 
  6, 
  

   no. 
  1, 
  p. 
  3; 
  1864b. 
  p. 
  530, 
  554, 
  648, 
  Reprint, 
  1872, 
  p. 
  16, 
  40, 
  134 
  = 
  Mopalia 
  lignosa 
  Gould 
  

   in 
  part; 
  Dall, 
  1879, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  vol. 
  1, 
  p. 
  304 
  under 
  Mopalia 
  ciliata 
  lignosa 
  

   Gould; 
  Pilsbry, 
  1892, 
  Man. 
  Conch., 
  vol. 
  XIV, 
  p. 
  300 
  under 
  Mopalia 
  lignosa 
  Gould 
  

  

  Carpenter 
  described 
  Chiton 
  monterevensis 
  from 
  a 
  specimen 
  in 
  the 
  Cuming 
  Collection. 
  

   Later 
  (1864b), 
  after 
  examining 
  perfect 
  specimens 
  of 
  the 
  same, 
  he 
  determined 
  the 
  form 
  as 
  

   equal 
  to 
  Mopalia 
  lignosa 
  (Gould). 
  Authors 
  have 
  continued 
  to 
  agree 
  with 
  Carpenter 
  in 
  that 
  

   assignment. 
  

  

  The 
  type 
  of 
  C. 
  vwntereyensis 
  is 
  in 
  the 
  British 
  Museum. 
  It 
  is 
  one 
  of 
  five 
  specimens 
  on 
  a 
  

   tablet 
  which 
  has 
  a 
  Cuming 
  label. 
  The 
  original 
  label 
  reads 
  : 
  "Montereyensis 
  Carp. 
  = 
  

  

  