﻿126 
  MARTXE 
  ^rOLLUSCA 
  DESCRIBED 
  BY 
  P. 
  V. 
  CARPENTER 
  

  

  "According 
  to 
  Darwin, 
  this 
  might 
  be 
  regarded 
  as 
  a 
  cross 
  between 
  the 
  northern 
  forms 
  A. 
  

   pclta 
  and 
  A. 
  patina, 
  about 
  to 
  change 
  into 
  the 
  Gulf 
  species, 
  A. 
  mesoleuca. 
  The 
  dark 
  variety 
  

   resembles 
  A. 
  cantharus, 
  but 
  the 
  very 
  delicate 
  crowded 
  striae 
  will 
  distinguish 
  it 
  when 
  not 
  

   abraded." 
  [Carpenter, 
  1864a, 
  p. 
  474] 
  

  

  Pilsbry 
  presented 
  a 
  detailed 
  description 
  and 
  illustration 
  of 
  the 
  type 
  which 
  is 
  in 
  the 
  U. 
  S. 
  

   National 
  Museum. 
  Burch 
  (1946) 
  has 
  analyzed 
  clearly 
  and 
  correctly 
  the 
  confusion 
  in 
  the 
  

   names 
  of 
  strigatella 
  and 
  strigillata. 
  The 
  use 
  of 
  strigillata 
  by 
  Carpenter 
  (1864b) 
  is 
  easily 
  dis- 
  

   pensed 
  with 
  because 
  it 
  is 
  a 
  typographical 
  error. 
  Carpenter 
  gave 
  a 
  description 
  (1866c) 
  using 
  

   a 
  manuscript 
  name 
  of 
  Nuttall. 
  He 
  defined 
  it 
  as 
  a 
  variety 
  of 
  A. 
  patina 
  and 
  differentiated 
  it 
  

   from 
  A. 
  strigatella 
  of 
  the 
  Lower 
  Californian 
  fauna. 
  

  

  The 
  form 
  A. 
  patina 
  strigillata 
  "Nuttall," 
  Carpenter 
  is 
  ambiguous 
  as 
  to 
  type 
  and 
  type 
  lo- 
  

   cality. 
  Carpenter 
  (1866c) 
  intimated 
  that 
  it 
  was 
  from 
  California 
  or 
  Vancouver. 
  It 
  is 
  in 
  part 
  

   the 
  A. 
  persona 
  strigillata 
  of 
  Dall 
  (1921), 
  but 
  until 
  the 
  type 
  locality 
  and 
  type 
  are 
  defined 
  a 
  

   precise 
  distribution 
  is 
  not 
  authentic. 
  The 
  type 
  has 
  not 
  been 
  found. 
  

  

  The 
  first 
  use 
  of 
  A. 
  strigillata 
  was 
  a 
  typographical 
  error, 
  hence 
  a 
  nomcn 
  nudum, 
  and 
  there- 
  

   fore 
  does 
  not 
  preoccupy 
  the 
  name 
  as 
  stated 
  by 
  Burch 
  (homonym). 
  

  

  Burch's 
  suggestion 
  that 
  A. 
  persona 
  (=: 
  A. 
  persona 
  strigillata 
  "Nuttall" 
  Carpenter) 
  is 
  the 
  

   northern 
  form 
  and 
  A. 
  persona 
  strigatella 
  the 
  southern 
  seems 
  feasible. 
  

  

  Holotype.—U. 
  S. 
  National 
  Museum, 
  no. 
  19594 
  (A. 
  strigatella) 
  

  

  Distribution. 
  — 
  Cape 
  San 
  Lucas, 
  Lower 
  California 
  (type) 
  ; 
  Monterey, 
  California, 
  to 
  

   Lower 
  California 
  (Burch). 
  Not 
  included 
  as 
  California 
  species 
  by 
  Test 
  (1946). 
  

  

  "Acmaea 
  strigillata 
  Nuttall" 
  Carpenter 
  

  

  "Patella 
  strigillata 
  Nutt. 
  ms. 
  Jay's 
  Cat. 
  no. 
  2881," 
  Carpenter, 
  1856, 
  Zool. 
  Soc. 
  London, 
  

   Proc., 
  p. 
  221 
  under 
  A. 
  pelta 
  pars; 
  Carpenter, 
  1866, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  II, 
  p. 
  334, 
  

   337 
  P. 
  strigillata 
  Nutt., 
  pars 
  under 
  A. 
  patina 
  not 
  p. 
  337 
  under 
  A. 
  pclta. 
  

  

  Not 
  Acmaea 
  strigillata 
  Carpenter, 
  186-lb, 
  p. 
  618; 
  Reprint, 
  1872, 
  p. 
  104 
  error 
  for 
  A. 
  striga- 
  

   tella 
  

  

  Acmaea 
  patina 
  var. 
  strigillata 
  Cari)cnter, 
  Burch, 
  1946, 
  no. 
  57, 
  p. 
  10 
  

  

  "Var. 
  b. 
  strigillata 
  [of 
  A. 
  patina] 
  : 
  (= 
  A. 
  strigillata, 
  Nutt., 
  pars 
  = 
  A. 
  pelta 
  jun.) 
  Part 
  

   of 
  the 
  shells 
  thus 
  grouped 
  by 
  Gould, 
  'marginal 
  rim 
  narrower', 
  may 
  also 
  be 
  A. 
  pelta, 
  jun. 
  The 
  

   colors 
  run 
  into 
  stripes, 
  radiating 
  bifurcating. 
  Under 
  ordinary 
  circumstances, 
  this 
  variety 
  is 
  

   not 
  so 
  elevated 
  as 
  A. 
  pelta: 
  has 
  not 
  its 
  faint, 
  swelling 
  ribs; 
  but 
  displays, 
  instead, 
  the 
  typical, 
  

   sharp, 
  distant 
  striae; 
  and 
  has 
  a 
  wider 
  margin: 
  but 
  young 
  shells 
  with 
  the 
  outside 
  abraded, 
  are 
  

   verv 
  (lifTicult 
  to 
  determine 
  or 
  to 
  separate 
  from 
  A. 
  strigatella 
  of 
  Cape 
  St. 
  Lucas; 
  q. 
  v. 
  in 
  Ann. 
  

   Nat. 
  Hist." 
  [Carpenter, 
  1866c, 
  p. 
  334] 
  

  

  For 
  an 
  analysis 
  of 
  the 
  history 
  of 
  this 
  name 
  see 
  also 
  Acmaea 
  strigatella 
  Cari>entcr. 
  Jay 
  

   (1852, 
  p. 
  102, 
  no. 
  2881) 
  indicated 
  the 
  locality 
  as 
  "Upper 
  California," 
  for 
  Nuttall's 
  shell. 
  

  

  The 
  type 
  of 
  this 
  species 
  has 
  not 
  been 
  found. 
  It 
  is 
  not 
  at 
  the 
  British 
  Museum 
  Natural 
  

   History 
  (G. 
  L. 
  Wilkins, 
  Oct. 
  17, 
  1950, 
  personal 
  communication) 
  where 
  some 
  of 
  Nuttall's 
  

   material 
  is 
  preserved. 
  

  

  Subgenus 
  Collisella 
  Dall, 
  1871 
  

  

  Collisella 
  Dale, 
  1871, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  p. 
  245 
  

  

  Type 
  species 
  liy 
  original 
  designation 
  Collisella 
  pelta 
  ( 
  Eschscholtz)j;i 
  Rattike, 
  1833, 
  Zool. 
  

   Atlas, 
  pt. 
  5, 
  p. 
  19. 
  Recent. 
  Okhotsk 
  and 
  southern 
  Bering 
  Sea, 
  Nushagak, 
  Alaska, 
  Aleu- 
  

   tians 
  south 
  to 
  Rosaria 
  Bay, 
  Lower 
  California 
  and 
  Socorro 
  Islands 
  (Dall). 
  Japan, 
  (Keen, 
  

   1941, 
  Sixth 
  Pacific 
  Cong., 
  vol. 
  3, 
  p. 
  481; 
  Burch, 
  1946). 
  Dall, 
  1871, 
  pi. 
  14, 
  fig. 
  6 
  radula; 
  

   PiLsiiRY, 
  1891, 
  Alan. 
  Conch., 
  vol. 
  XIII, 
  pi. 
  8, 
  figs. 
  90, 
  91 
  "original"; 
  Abbott, 
  1954, 
  pi. 
  18, 
  

   fig. 
  n 
  

  

  Acmaea 
  (Collisella) 
  triangularis 
  (Carpenter) 
  

   (PI. 
  18, 
  fig 
  18) 
  

  

  Nacella 
  (? 
  palcacca, 
  var.) 
  triangularis 
  Carpenter, 
  1864b, 
  p. 
  612, 
  650; 
  Reprint, 
  1872, 
  p. 
  98, 
  

   136; 
  1866, 
  California 
  Acad. 
  Sci., 
  Proc, 
  vol. 
  Ill, 
  p. 
  213; 
  Keep, 
  1887, 
  West 
  Coast 
  Shells, 
  

   p. 
  104 
  

  

  Nacella 
  triangularis 
  Carpenter, 
  Cooper, 
  1867, 
  Geo. 
  Cat. 
  Moll., 
  Gcol. 
  Sur. 
  California, 
  p. 
  23; 
  

   1870, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  p. 
  59 
  

  

  Acmaea 
  (Collisella) 
  ? 
  triangularis 
  (Carpenter), 
  Dall, 
  1871, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  

   p. 
  254 
  

  

  