﻿274 
  MARINE 
  MOLLUSCA 
  DESCRIBED 
  BY 
  P. 
  P. 
  CARPENTER 
  

  

  "Ischnochiton 
  cooperi 
  acutior" 
  Dall 
  

   (PI. 
  34, 
  figs. 
  1-6) 
  

   See 
  /. 
  cooperi 
  

   Ischnochiton 
  cooperi 
  acutior 
  Carpenter 
  ms., 
  Dall, 
  1919, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  vol. 
  55, 
  

   no. 
  2283, 
  p. 
  508; 
  1921, 
  p. 
  192; 
  Oldroyd, 
  1927, 
  vol. 
  II, 
  pt. 
  Ill, 
  p. 
  282; 
  Willett, 
  1935, 
  

   Nautilus, 
  vol. 
  49, 
  no. 
  2, 
  p. 
  44 
  

  

  This 
  species 
  was 
  never 
  adequately 
  described 
  by 
  Dall. 
  He 
  used 
  a 
  manuscript 
  name 
  of 
  

   Carpenter's. 
  At 
  first 
  he 
  did 
  not 
  regard 
  the 
  name 
  as 
  representing 
  more 
  than 
  a 
  color 
  variation 
  

   of 
  /. 
  cooperi 
  Carpenter. 
  However, 
  he 
  later 
  (1921) 
  listed 
  the 
  form 
  as 
  a 
  bona 
  fide 
  subspecies, 
  

   from 
  "San 
  Diego 
  to 
  Los 
  Animas 
  Bay, 
  Lower 
  California." 
  

  

  The 
  liolotype 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  is 
  labelled, 
  "Todos 
  Santos 
  Bay 
  Hemphill" 
  

   and 
  marked 
  in 
  red 
  pencil 
  "type." 
  

  

  There 
  are 
  11 
  specimens 
  in 
  the 
  Cari)entcr 
  Collection 
  at 
  the 
  Redpath 
  Museum 
  which 
  are 
  

   labelled 
  "type" 
  by 
  Carpenter. 
  Five 
  of 
  them 
  are 
  from 
  Todos 
  Santos 
  Bay 
  collected 
  by 
  Hemp- 
  

   hill 
  (Redpath 
  Museum, 
  no. 
  18). 
  Six 
  others 
  are 
  labelled, 
  "Sta. 
  Cruz 
  Cooper 
  False 
  Bay 
  near 
  

   S. 
  Diego 
  collected 
  by 
  Hemphill" 
  (Redpath 
  Museum, 
  no. 
  8). 
  

  

  Since 
  the 
  form 
  has 
  not 
  been 
  illustrated 
  previously 
  the 
  illustrations 
  of 
  the 
  McGill 
  speci- 
  

   mens 
  are 
  included 
  herein. 
  They 
  are 
  not 
  types 
  because 
  the 
  subspecific 
  name 
  would 
  date 
  from 
  

   Dall 
  or 
  later, 
  depending 
  on 
  the 
  validity 
  of 
  Dall's 
  name. 
  The 
  problem 
  has 
  passed 
  beyond 
  the 
  

   scope 
  of 
  Carpenter 
  type 
  material. 
  The 
  illustrations 
  may 
  help 
  to 
  determine 
  whether 
  Dall 
  was 
  

   correct 
  in 
  assigning 
  subspecific 
  rank. 
  The 
  writer 
  includes 
  them 
  under 
  /. 
  cooperi. 
  

  

  Holotype. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  30734 
  

  

  Distribution. 
  — 
  Todos 
  Santos 
  Bay, 
  Lower 
  California 
  (type) 
  

  

  Ischnochiton 
  (Lepidozona) 
  decipiens 
  Carpenter 
  in 
  Pilsbry 
  

  

  Ischnochiton 
  decipiens 
  Carpenter 
  ms. 
  in 
  Pilsbry, 
  1892, 
  Man. 
  Conch., 
  vol. 
  XIV, 
  p. 
  123; 
  

   Dall, 
  1921, 
  p. 
  192; 
  Oldroyd, 
  1927, 
  vol. 
  II. 
  pt. 
  Ill, 
  p. 
  282; 
  Willett, 
  1935, 
  Nautilm, 
  vol. 
  

   49, 
  no. 
  2, 
  p. 
  43; 
  Burch, 
  1947, 
  no. 
  66, 
  p. 
  18; 
  Smith 
  and 
  Gordon, 
  California 
  Acad. 
  Sci., 
  

   Proc, 
  sen 
  4, 
  vol. 
  XXVI, 
  p. 
  207 
  

  

  This 
  species 
  bears 
  a 
  manuscript 
  name 
  of 
  Carpenter 
  which 
  was 
  validated 
  by 
  Pilsbry. 
  Un- 
  

   fortunately 
  the 
  species 
  was 
  not 
  figured, 
  and 
  the 
  whereabouts 
  of 
  the 
  type 
  does 
  not 
  seem 
  to 
  be 
  

   known. 
  Pilsbry 
  published 
  Carpenter's 
  manuscript 
  description. 
  That 
  description 
  is 
  also 
  avail- 
  

   able 
  in 
  Oldroyd 
  who 
  republished 
  a 
  copy 
  of 
  the 
  same. 
  Willett 
  thought 
  he 
  knew 
  what 
  /. 
  de- 
  

   cipiens 
  was 
  and 
  because 
  of 
  gradation 
  believed 
  that 
  the 
  form 
  named 
  /. 
  (jallina 
  by 
  Berry 
  was 
  

   merely 
  a 
  color 
  form 
  of 
  /. 
  decipiens. 
  

  

  In 
  a 
  list 
  of 
  chitons 
  in 
  Dall's 
  handwriting 
  in 
  the 
  collection 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  

   are 
  the 
  following 
  notations 
  : 
  

  

  "Not 
  in 
  collection 
  decipiens 
  Cpr. 
  1892 
  Monterey." 
  "Not 
  in 
  collections 
  decipiens 
  Cpr. 
  1892 
  

   Catalina 
  Id. 
  to 
  Monterey." 
  

  

  Holotype. 
  — 
  Not 
  found 
  

  

  Distrihutinn. 
  — 
  Monterey, 
  California 
  (type) 
  ; 
  Catalina 
  Island, 
  to 
  Monterey 
  (Dall) 
  

  

  Ischnochiton 
  radians 
  Carpenter 
  in 
  Pilsbry 
  

   (PI. 
  30, 
  fig. 
  13; 
  PI. 
  31, 
  fig.s. 
  8-17) 
  

  

  Ischnochiton 
  radians 
  Carpenter 
  ms. 
  in 
  Pilsbry, 
  1892, 
  Man. 
  Conch., 
  vol. 
  XIV, 
  p. 
  121 
  ; 
  1893, 
  

   vol. 
  XV, 
  p. 
  75, 
  pi. 
  16, 
  figs. 
  48. 
  49; 
  Thiele, 
  1909, 
  Zoologica, 
  Bd. 
  22, 
  Heft 
  56, 
  p. 
  80, 
  fig. 
  62; 
  

   Reurv. 
  1917, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  VII, 
  p. 
  235: 
  Dall, 
  1921, 
  p. 
  191; 
  

   Oldroyd, 
  1924, 
  Pub. 
  Pugct 
  Sound 
  Biol. 
  Station, 
  vol. 
  4, 
  p. 
  191; 
  1927, 
  vol. 
  II, 
  pt. 
  Ill, 
  

   p. 
  275; 
  BuRCH, 
  1947, 
  no. 
  66, 
  p. 
  18; 
  Satith 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  

   vol. 
  XXVI, 
  no. 
  8, 
  p. 
  207 
  

  

  In 
  this 
  case 
  Pilsbry 
  used 
  Carpenter's 
  manuscript 
  name 
  and 
  description, 
  meaning 
  thereby 
  

   to 
  give 
  partial 
  credit 
  to 
  Carpenter. 
  Pilsbry 
  also 
  mentioned 
  that 
  the 
  specimen 
  figured 
  by 
  him 
  

   was 
  not 
  Carpenter's 
  type 
  but 
  a 
  secondary 
  specimen 
  from 
  the 
  Smithsonian 
  Institution. 
  Car- 
  

   penter's 
  original 
  types 
  (mentioned 
  by 
  Pilsbry) 
  are 
  in 
  the 
  Redpath 
  Museum. 
  There 
  are 
  four 
  

   specimens 
  mounted 
  and 
  labelled 
  by 
  Carpenter, 
  "type 
  Monterey 
  Canfield." 
  Since 
  the 
  McGill 
  

   specimens 
  are 
  more 
  complete 
  tlian 
  that 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  (No. 
  19471), 
  the 
  

  

  