﻿146 
  MARINE 
  MOLLUSCA 
  DESCRIBED 
  HV 
  I'. 
  P. 
  CARPENTER 
  

  

  The 
  lectotype 
  (the 
  second 
  specimen 
  mentioned 
  by 
  Carpenter 
  has 
  apparently 
  been 
  lost) 
  

   has 
  six 
  large 
  spiral 
  ribs 
  on 
  the 
  body 
  whorl. 
  The 
  apical 
  whorls 
  are 
  flat. 
  The 
  spiral 
  ribs 
  are 
  

   crossed 
  by 
  equally 
  large 
  longitudinal 
  ribs. 
  The 
  crossing 
  of 
  the 
  two 
  sets 
  of 
  ribs 
  forms 
  a 
  large 
  

   rectangular 
  sculptural 
  pattern. 
  The 
  umbilicus 
  is 
  large, 
  deep, 
  and 
  the 
  margin 
  has 
  a 
  coarse 
  

   rib. 
  The 
  shell 
  was 
  a 
  dead 
  specimen. 
  Its 
  occupant, 
  a 
  Iiermit 
  crab, 
  is 
  still 
  intact. 
  

  

  Lectotype. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  16283 
  

  

  Distribution. 
  — 
  Recent. 
  Catalina 
  Island, 
  California 
  (type) 
  ; 
  Monterey, 
  California, 
  to 
  San 
  

   Martin, 
  Lower 
  California 
  (Burch). 
  Pleistocene 
  (Woodring, 
  Bramlette, 
  and 
  Kew, 
  1946, 
  p. 
  63) 
  

  

  Genus 
  Arene 
  \\. 
  and 
  .\. 
  Adams, 
  1854 
  

  

  Arenc 
  H. 
  and 
  A. 
  Adams, 
  1854, 
  Genera 
  Recent 
  Mollusca, 
  vol. 
  I, 
  p. 
  404 
  

  

  Type 
  species 
  by 
  subsequent 
  designation, 
  Woodrixg, 
  1928, 
  Carnegie 
  Inst. 
  Washington, 
  Pub. 
  

  

  385. 
  p. 
  422, 
  Turbo 
  crucntatu.'^ 
  Mkrgeki.e 
  von 
  Mimilfeld. 
  1824, 
  Ges. 
  Nat. 
  Fr. 
  Berlin, 
  verb. 
  

  

  1, 
  pt. 
  4, 
  p. 
  211. 
  pi. 
  VII 
  [11. 
  figs. 
  8a, 
  8b. 
  Recent. 
  West 
  Indies. 
  Pii.sbry, 
  1888, 
  Man. 
  Conch., 
  

  

  vol. 
  X, 
  pi. 
  36. 
  fig. 
  9; 
  Dclphinula 
  radiafa 
  Kiener, 
  1838-1839,*^° 
  Spec. 
  gen. 
  Icon, 
  coq., 
  vol. 
  X, 
  

  

  Delphinula, 
  pi. 
  4, 
  fig. 
  9 
  

  

  Arene 
  acuticostata 
  Carpenter 
  

   (PL 
  19, 
  figs. 
  12, 
  13) 
  

  

  Liotia 
  acutico<;tata 
  Carpenter. 
  1864b 
  Aug., 
  p. 
  612, 
  652; 
  Reprint. 
  1872, 
  p. 
  98, 
  138; 
  1864, 
  Dec, 
  

   [date 
  on 
  bottom 
  of 
  p. 
  161], 
  California 
  Acad. 
  Sci., 
  Proc, 
  vol. 
  Ill, 
  p. 
  159; 
  Cooper, 
  1867, 
  

   Geog. 
  Cat. 
  Moll, 
  Geol. 
  Sur. 
  California, 
  p. 
  25 
  ; 
  Tryon, 
  1888, 
  Man. 
  Conch., 
  vol. 
  X, 
  p. 
  109, 
  

   pi. 
  36, 
  fig. 
  1 
  ; 
  Williamson, 
  1892, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  vol. 
  15, 
  no. 
  898, 
  p. 
  199; 
  Strong 
  

   AND 
  Hanna. 
  1930, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4. 
  vol. 
  19, 
  p. 
  5, 
  19; 
  Dall, 
  1921, 
  

   p. 
  173: 
  Oldrovd, 
  1927, 
  vol. 
  II, 
  Pt. 
  Ill, 
  p. 
  170; 
  Strong, 
  1934. 
  San 
  Diego 
  Soc 
  Nat. 
  Hist., 
  

   vol. 
  VII, 
  no. 
  2,7, 
  p. 
  437, 
  pi. 
  29, 
  figs. 
  7, 
  8, 
  9, 
  figs. 
  13, 
  14, 
  15 
  var. 
  bristotae 
  Baker; 
  Keen, 
  1937, 
  

   p. 
  2,7 
  

  

  Arene 
  acuticostata 
  (Carpenter). 
  Burch. 
  1946, 
  no. 
  57, 
  p. 
  26; 
  Smith 
  and 
  Gordon, 
  1948, 
  Cali- 
  

   fornia 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  XXVI, 
  p. 
  201 
  

  

  "Small. 
  Sharply 
  keeled, 
  without 
  radiating 
  sculpture. 
  10-20 
  fm. 
  Cp." 
  [Carpenter, 
  1864b, 
  

   p. 
  652] 
  

  

  The 
  following 
  lines 
  should 
  be 
  added 
  to 
  Oldroyd's 
  copy 
  (1927) 
  of 
  Carpenter's 
  description 
  

   (1864, 
  p. 
  159): 
  

  

  "Long. 
  0.12, 
  long. 
  spir. 
  0.06, 
  lat. 
  0.10, 
  div. 
  95°. 
  

  

  "Hab. 
  Catalina 
  Island, 
  10-20 
  fms. 
  4, 
  alive; 
  Monterey, 
  4 
  dead, 
  dredged? 
  

  

  "This 
  pretty 
  little 
  Cyclostomoid 
  species 
  is 
  easily 
  recognized 
  by 
  the 
  sharp 
  revolving 
  keels, 
  

   and 
  the 
  absence 
  of 
  radiating 
  sculpture." 
  [Carpenter, 
  1864b, 
  p. 
  159] 
  

  

  On 
  the 
  lectotype 
  there 
  are 
  seven 
  large 
  spiral 
  ribs 
  on 
  the 
  body 
  whorl 
  including 
  the 
  base 
  

   where 
  the 
  last 
  spiral 
  rib 
  continues 
  into 
  the 
  umbilicus. 
  Microscopic 
  longitudinal 
  .striae 
  cross 
  

   the 
  spiral 
  ribs 
  on 
  the 
  spire. 
  The 
  illustrations 
  in 
  Strong 
  of 
  A. 
  acuticostata 
  bristolae 
  are 
  more 
  

   like 
  those 
  of 
  the 
  type 
  of 
  A. 
  acuticostata 
  than 
  are 
  the 
  illustrations 
  which 
  Strong 
  gave 
  for 
  

   typical 
  A. 
  acuticostata. 
  

  

  The 
  absence 
  of 
  radiating 
  sculpture, 
  which 
  Carpenter 
  noted, 
  and 
  the 
  character 
  upon 
  which 
  

   Dall 
  founded 
  the 
  subspecies 
  radiata 
  Dall 
  (1918a, 
  p. 
  8; 
  Baker, 
  1927, 
  p. 
  72; 
  Strong, 
  1934, 
  

   p. 
  438, 
  pi. 
  29, 
  figs. 
  13-15) 
  (= 
  bristolae 
  Baker) 
  are 
  probably 
  not 
  so 
  important 
  as 
  those 
  

   authors 
  believed. 
  The 
  radiating 
  lines 
  are 
  fine 
  and 
  are 
  seen 
  on 
  the 
  type 
  under 
  the 
  binoculars. 
  

   Their 
  absence 
  in 
  some 
  cases 
  may 
  be 
  due 
  to 
  decortication. 
  

  

  The 
  lectotype 
  of 
  A. 
  acuticostata 
  in 
  the 
  U. 
  S. 
  National 
  Museum 
  has 
  a 
  label, 
  "type 
  fig'd." 
  

   The 
  writer 
  has 
  not 
  found 
  an 
  illustration 
  of 
  the 
  specimen 
  previous 
  to 
  the 
  ones 
  herein. 
  The 
  

   figure 
  Tryon 
  (1888, 
  pi. 
  36, 
  fig. 
  1) 
  might 
  be 
  the 
  shell, 
  but 
  the 
  writer 
  doubts 
  that 
  identity. 
  The 
  

   explanation 
  of 
  the 
  figure 
  by 
  Tryon 
  (1888, 
  pi. 
  Z6, 
  fig. 
  1) 
  described 
  the 
  individual 
  as 
  "speci- 
  

   men," 
  and 
  the 
  execution 
  of 
  the 
  drawing 
  of 
  the 
  sculpture 
  of 
  the 
  shell 
  is 
  not 
  true 
  enough 
  for 
  

   identification. 
  

  

  Since 
  there 
  were 
  originally 
  several 
  sj-ntypes 
  (4:4) 
  it 
  seems 
  more 
  appropriate 
  to 
  refer 
  to 
  

   the 
  remaining 
  specimen 
  as 
  a 
  lectotype 
  than 
  a 
  holotype. 
  

  

  Lectotype. 
  — 
  U. 
  S. 
  National 
  Mu.scum, 
  no. 
  16282 
  

  

  «o 
  Sherborn 
  and 
  Woodward 
  (1901, 
  p. 
  219) 
  

  

  