﻿GASTROPODA 
  

  

  127 
  

  

  Acmaea 
  triangularis 
  (Carpenter), 
  Pilsbry, 
  1891, 
  Man. 
  Conch., 
  vol. 
  XIII, 
  p. 
  20, 
  pi. 
  7, 
  figs. 
  

  

  77, 
  78 
  type; 
  Oldroyd, 
  1927, 
  p. 
  158; 
  Baily, 
  1935, 
  West 
  Coast 
  Shells 
  (Keep), 
  p. 
  175 
  ? 
  var. 
  

  

  A. 
  palcacea; 
  Keen, 
  1937, 
  p. 
  28; 
  Burch, 
  1946, 
  no. 
  57, 
  p. 
  13; 
  Test, 
  1946, 
  Cont. 
  Univ. 
  Mich. 
  

  

  Lab. 
  Vert. 
  Biol., 
  no. 
  31, 
  p. 
  1, 
  18; 
  S^rITII 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  

  

  ser. 
  4, 
  vol. 
  XXVI, 
  p. 
  200 
  

   Acmaea 
  triangularis 
  casta 
  Carpenter 
  ms. 
  Dall, 
  1871, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  p. 
  254; 
  

  

  Pilsbry, 
  1891, 
  Man. 
  Conch., 
  vol. 
  XIII, 
  p. 
  20, 
  pi. 
  7, 
  figs. 
  74-76 
  type 
  

   Acmaea 
  {CoUisella) 
  triangularis 
  (Carpenter), 
  BuRCii, 
  1946, 
  no. 
  56, 
  p. 
  35, 
  no. 
  57, 
  p. 
  5 
  per 
  

  

  Test, 
  p. 
  13 
  

  

  "Nacclla 
  ? 
  triangularis. 
  Shorter 
  [than 
  N 
  . 
  paleacea 
  Gould] 
  apex 
  raised 
  ; 
  scarcely 
  striated 
  : 
  

   whitish, 
  with 
  brown 
  spots." 
  [Carpenter, 
  1866a, 
  p. 
  650] 
  

  

  The 
  following 
  lines 
  should 
  be 
  added 
  to 
  the 
  copy 
  of 
  Carpenter's 
  description 
  (1866a) 
  as 
  

   published 
  by 
  Oldroyd 
  (1927) 
  to 
  make 
  that 
  copy 
  complete: 
  

  

  ;;— 
  alt. 
  0.18, 
  div. 
  90°. 
  

  

  "Hah. 
  Monterey. 
  4 
  dredged 
  dead. 
  Cooper. 
  

  

  Probably 
  a 
  distinct 
  species. 
  The 
  solitary 
  shell 
  sent 
  by 
  Dr. 
  Cooper 
  is 
  shaped 
  like 
  a 
  right- 
  

   angled 
  triangle, 
  with 
  five 
  large 
  brown 
  spots 
  near 
  the 
  base." 
  [Carpenter, 
  1866a, 
  p. 
  213] 
  

  

  Dall 
  (1871) 
  discussed 
  this 
  species 
  in 
  detail 
  and 
  introduced 
  a 
  manuscript 
  varietal 
  name 
  

   casta 
  of 
  Carpenter. 
  Pilsbry 
  (1891) 
  illustrated 
  the 
  holotype 
  of 
  each 
  name. 
  The 
  specimen 
  il- 
  

   lustrated 
  is 
  not 
  available. 
  Therefore, 
  the 
  specimen 
  labeled 
  "type" 
  in 
  the 
  Redpath 
  Museum 
  is 
  

   logically 
  eligible 
  as 
  lectotype. 
  Neither 
  author 
  regarded 
  the 
  varietal 
  name 
  as 
  necessary. 
  

  

  There 
  are 
  in 
  the 
  Redpath 
  Museum 
  14 
  specimens 
  with 
  an 
  original 
  label, 
  "N^acella 
  casta 
  

   Cpr. 
  (var. 
  = 
  triangularis) 
  type 
  Monterey." 
  There 
  is 
  a 
  note 
  with 
  the 
  specimen, 
  "I 
  think 
  this 
  

   series 
  of 
  specimens 
  prove 
  that 
  they 
  all 
  belong 
  to 
  one 
  species. 
  I 
  have 
  two 
  specimens 
  (not 
  

   worn) 
  that 
  are 
  perfectly 
  white. 
  It 
  is 
  obvious 
  then 
  the 
  name 
  'depicta' 
  [Hinds] 
  is 
  not 
  approp- 
  

   riate; 
  nor 
  is 
  the 
  name 
  'triangularis' 
  unless 
  it 
  refers 
  to 
  the 
  profile 
  of 
  the 
  shell. 
  C. 
  A. 
  Can- 
  

   field 
  Monterey 
  Nov. 
  5, 
  1867." 
  

  

  One 
  of 
  the 
  above 
  shells 
  is 
  figured 
  herein. 
  Some 
  of 
  the 
  shells 
  are 
  white, 
  others 
  are 
  marked 
  

   like 
  the 
  illustrated 
  shell. 
  All 
  the 
  specimens 
  have 
  a 
  conspicuous 
  brown 
  spot 
  just 
  below 
  the 
  

   apex. 
  Some 
  have 
  brown 
  radiating 
  spots 
  over 
  the 
  surface. 
  One 
  individual 
  has 
  5 
  spots 
  on 
  the 
  

   posterior 
  end. 
  The 
  external 
  margins 
  are 
  all 
  white 
  with 
  the 
  marks 
  above. 
  A 
  few 
  specimens 
  

   have 
  a 
  pinkish 
  interior. 
  

  

  The 
  type 
  of 
  A. 
  triangularis 
  was 
  figured 
  by 
  Pilsbry 
  (1891). 
  

  

  Syntypes. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  14802 
  (A. 
  triangularis) 
  ; 
  Redpath 
  Museum, 
  no. 
  

   2370 
  (casta 
  Carpenter 
  ms.). 
  

  

  Distribution. 
  — 
  Monterey, 
  California 
  (type) 
  ; 
  Sitka, 
  Alaska, 
  to 
  the 
  Gulf 
  of 
  California, 
  on 
  

   sea 
  grasses 
  (Dall) 
  ; 
  Monterey, 
  California, 
  on 
  calcareous 
  alga 
  Amphiroa 
  tuberculosa 
  Decaisne 
  

   (Chace 
  in 
  Burch 
  ; 
  Smith 
  and 
  Gordon). 
  

  

  "Acmaea 
  monticola 
  (monticula)" 
  

  

  "Patella 
  monticola 
  Nutt. 
  MS. 
  = 
  P. 
  monticolor 
  Jay's 
  Cat. 
  no. 
  2844" 
  Carpenter, 
  1856, 
  Zool. 
  

   Soc. 
  London, 
  Proc, 
  p. 
  221 
  under 
  Acmaea 
  pelta 
  Esch. 
  

  

  Acmaea 
  monticula 
  Nuttall 
  MS. 
  in 
  Carpenter, 
  1864b, 
  p. 
  586 
  "[monticola]" 
  ; 
  Reprint, 
  1872 
  

   not 
  described 
  ; 
  Carpenter, 
  1866, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  II, 
  p. 
  337 
  not 
  described 
  "monti- 
  

   cola" 
  : 
  Pilsbry, 
  1891, 
  Man. 
  Conch., 
  vol. 
  XIII 
  listed 
  under 
  A. 
  pelta 
  ?, 
  p. 
  17 
  "monticola," 
  

   p. 
  34, 
  "monticula" 
  under 
  A. 
  ccciliana 
  

  

  Acm-aea 
  cassis 
  monticola 
  (Carpenter), 
  Dall, 
  1921, 
  p. 
  169 
  as 
  of 
  Carpenter, 
  1866, 
  Amer. 
  

   Jour. 
  Conch., 
  vol. 
  II, 
  p. 
  337 
  

  

  Acmaea 
  (CoUisella) 
  pelta 
  (Eschscholtz), 
  Burch, 
  1946, 
  no. 
  56, 
  p. 
  34; 
  no. 
  57, 
  p. 
  10 
  monticola 
  

   regarded 
  as 
  variant 
  

  

  Acmaea 
  monticola 
  Dall, 
  Smith 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  

   XXVI, 
  p. 
  200 
  synonym 
  of 
  A. 
  pelta 
  

  

  A. 
  "monticola" 
  ("monticula") 
  is 
  certainly 
  a 
  nomen 
  nudum 
  (or 
  nomina 
  nuda), 
  because 
  no 
  

   description 
  was 
  given 
  by 
  Carpenter 
  or 
  Dall. 
  The 
  name 
  has 
  been 
  credited 
  to 
  both 
  authors. 
  

   The 
  only 
  remark 
  Carpenter 
  made 
  concerning 
  the 
  form 
  (1866c) 
  is, 
  "In 
  its 
  [pelta] 
  early 
  

   adolescence, 
  irregular 
  decorticated 
  sliells 
  are 
  the 
  A. 
  monticola 
  of 
  Nutt. 
  MS." 
  That 
  is 
  not 
  an 
  

   adequate 
  description. 
  Dall 
  (1921, 
  p. 
  169) 
  referred 
  to 
  the 
  above 
  reference 
  of 
  Carpenter, 
  and 
  

  

  