﻿GASTROPODA 
  

  

  173 
  

  

  "As 
  to 
  the 
  vcrmetid 
  — 
  it 
  is, 
  F 
  think, 
  as 
  much 
  Pctaloconchns 
  as 
  anything. 
  One 
  broken 
  speci- 
  

   men 
  shows 
  faint 
  columellar 
  threads. 
  I 
  find 
  we 
  have 
  about 
  a 
  dozen 
  specimens 
  of 
  what 
  is 
  

   probably 
  this 
  species. 
  Ours, 
  however, 
  are 
  not 
  solitary. 
  They 
  all 
  show 
  the 
  faint 
  columellar 
  

   thread 
  and 
  the 
  same 
  manner 
  of 
  coiling- 
  which 
  is 
  characteristic 
  of 
  the 
  genus. 
  I 
  wish 
  I 
  could 
  

   find 
  an 
  operculum, 
  as 
  that 
  would 
  clinch 
  the 
  matter. 
  Our 
  specimens 
  had 
  been 
  identified, 
  pre- 
  

   sumably 
  by 
  Dr. 
  Dall. 
  as 
  P. 
  complicatus. 
  They 
  are 
  not 
  the 
  P. 
  complicatus 
  we 
  have 
  from 
  

   southern 
  California, 
  which 
  has 
  very 
  heavy 
  internal 
  laminae, 
  but 
  that 
  is 
  another 
  problem. 
  

   This 
  specimen 
  of 
  yours 
  confirms 
  a 
  suspicion 
  that 
  has 
  been 
  growing 
  on 
  me 
  that 
  the 
  name 
  

   Bivonia 
  is 
  unnecessary 
  anyway 
  and 
  need 
  not 
  be 
  replaced. 
  I 
  am 
  beginning 
  to 
  feel 
  certain 
  that 
  

   we 
  shall 
  have 
  to 
  redefine 
  Pctaloconclms 
  to 
  include 
  species 
  with 
  obsolete 
  laminae, 
  for 
  I 
  have 
  

   found 
  specimens 
  with 
  Pctaloconchns 
  opcrcula 
  and 
  nuclear 
  whorls 
  which 
  had 
  no 
  laminae, 
  but 
  

   I 
  shall 
  have 
  to 
  do 
  much 
  more 
  comparative 
  work 
  before 
  I 
  am 
  positive." 
  

  

  Aletes 
  squamigerus 
  Carpenter 
  

  

  Aletes 
  squamigerus 
  Carpenter, 
  1856, 
  Zool. 
  Soc. 
  London, 
  Proc, 
  p. 
  226; 
  1857, 
  Rept. 
  British 
  

  

  Assoc. 
  Adv. 
  Sci. 
  for 
  1856, 
  p. 
  200, 
  233, 
  324. 
  349; 
  1857. 
  Cat. 
  Mazatlan 
  Shells, 
  p. 
  303. 
  304; 
  

  

  1860, 
  Smith. 
  Misc. 
  Coll.. 
  vol. 
  2, 
  art. 
  6, 
  p. 
  4 
  ; 
  Dall, 
  1921, 
  p. 
  151; 
  Oldrovd, 
  1927. 
  vol. 
  II, 
  

  

  pt 
  III, 
  p. 
  49; 
  Grant 
  and 
  Gale, 
  1931, 
  p. 
  777; 
  Keen. 
  1937, 
  p. 
  29; 
  Wenz, 
  1939. 
  Hand. 
  

  

  Paleozol., 
  Bd. 
  6. 
  Teil 
  3. 
  p. 
  675, 
  fig. 
  1928 
  copy 
  Tryon, 
  fig. 
  72 
  ; 
  Burch, 
  1945, 
  no. 
  54, 
  p. 
  43 
  ; 
  

  

  Smith 
  and 
  Gordon. 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4. 
  vol. 
  XXVI, 
  p. 
  196; 
  Abbott, 
  

  

  1954, 
  p. 
  144, 
  pi. 
  20, 
  fig. 
  e 
  

   Thylacodcs 
  squamigcra 
  (Carpenter), 
  Morch, 
  1862. 
  Zool. 
  Soc. 
  London, 
  Proc, 
  p. 
  76 
  identical 
  

  

  with 
  var. 
  pcnnata: 
  Carpenter, 
  1864b, 
  p. 
  557; 
  Reprint, 
  1872. 
  p. 
  43 
  

   J'cnnctus 
  (Thylacodcs) 
  squamigerus 
  (Carpenter), 
  Tryon, 
  1886, 
  Alan. 
  Conch., 
  vol. 
  VIII, 
  

  

  p. 
  181, 
  pi. 
  54. 
  figs 
  73. 
  74 
  

   ScrpuJorbis 
  squamigerus 
  Carpenter, 
  1864b, 
  p. 
  557, 
  654; 
  Reprint, 
  1872, 
  p. 
  43, 
  140; 
  Cooper, 
  

  

  1867. 
  Geog. 
  Cat. 
  Moll. 
  Geol. 
  Sur. 
  California, 
  p. 
  27; 
  Keep, 
  1887, 
  West 
  Coast 
  Shells, 
  p. 
  74; 
  

  

  Cooper, 
  1888, 
  7th 
  Ann. 
  Rept. 
  California 
  State 
  Min. 
  Bur., 
  p. 
  264; 
  Williamson, 
  1892, 
  

  

  U. 
  S. 
  Nat. 
  Mus., 
  Proc, 
  vol. 
  15 
  no. 
  898, 
  p. 
  204; 
  Arnold, 
  1903, 
  p. 
  299 
  

  

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

   description 
  : 
  

  

  "Hab. 
  Sta. 
  Barbara. 
  Sp. 
  magn. 
  glomer. 
  in 
  AIus. 
  Nuttall 
  ; 
  San 
  Diego, 
  Mus. 
  Gould. 
  

  

  "A 
  fine 
  group 
  of 
  this 
  shell 
  is 
  in 
  Mr. 
  Xuttall's 
  collection. 
  It 
  agrees 
  in 
  the 
  main 
  with 
  the 
  

   Mazatlan 
  species, 
  but 
  differs 
  in 
  colour 
  and 
  sculpture. 
  Mr. 
  Xuttall 
  believes 
  that 
  he 
  found 
  an- 
  

   other 
  species 
  without 
  scales." 
  [Carpenter. 
  1856e. 
  p. 
  226] 
  

  

  "Scrpulorbis 
  squamigerus, 
  Cpr. 
  P.Z.S. 
  1856. 
  p. 
  226 
  (not 
  Aletes). 
  Large, 
  scaly. 
  Verm, 
  

   anellum. 
  Morch, 
  P.Z.S. 
  1861, 
  p. 
  359, 
  is 
  perhaps 
  the 
  young." 
  [Carpenter, 
  1864b, 
  p. 
  654] 
  

  

  The 
  type 
  is 
  not 
  in 
  the 
  British 
  Museum 
  (G. 
  L. 
  Wilkins, 
  Oct. 
  17, 
  1950, 
  personal 
  commu- 
  

   nication). 
  

  

  Type. 
  — 
  Mot 
  found 
  

  

  Distribution. 
  — 
  Recent. 
  Santa 
  Barbara. 
  California 
  (type). 
  Monterey, 
  California, 
  to 
  Payta. 
  

   Peru, 
  and 
  the 
  Galapagos 
  Islands 
  (Dall). 
  Pleistocene. 
  California 
  (Cooper; 
  Arnold; 
  Chace, 
  

   1919; 
  Oldroyd, 
  1925; 
  Stephens. 
  1929; 
  Grant 
  and 
  Gale; 
  Willett, 
  1937). 
  Mexico 
  (Jordan, 
  

   1926; 
  Hertlein, 
  1934) 
  

  

  Note. 
  — 
  "I'crmctus 
  lifuclla 
  Cpr." 
  in 
  Berry, 
  1907, 
  Nautilus, 
  vol. 
  21, 
  p. 
  43. 
  The 
  "Cpr." 
  is 
  an 
  

   error 
  for 
  Morch. 
  

  

  Family 
  Caecidae 
  

   Genus 
  Caecum 
  Fleming. 
  1813 
  

  

  Caecum 
  Fleming. 
  1813. 
  Brewster's 
  Edinburgh 
  Encyclopaedia, 
  vol. 
  VII, 
  p. 
  67 
  fide 
  Neave 
  

   (1939-40) 
  and 
  Sherborn 
  (1937) 
  ; 
  1815. 
  American 
  ed.. 
  vol. 
  6, 
  pt. 
  2, 
  p. 
  689 
  

  

  Type 
  species 
  by 
  subsequent 
  designation. 
  Gray, 
  1847, 
  Zool. 
  Soc 
  London. 
  Proc. 
  pt. 
  XV, 
  p. 
  203. 
  

   Dcntalium 
  trachea 
  Montagu. 
  1803, 
  Testacea 
  Britannica, 
  pt. 
  2, 
  p. 
  497. 
  pi. 
  14, 
  fig. 
  10. 
  Liv- 
  

   ing. 
  European 
  seas. 
  Harmer, 
  1923, 
  Palaeont. 
  Soc, 
  vol. 
  LXXV, 
  p. 
  847, 
  pi. 
  LXIV, 
  fig. 
  32 
  

  

  Caecum 
  californicum 
  Dall 
  

  

  (PI. 
  20, 
  figs. 
  8, 
  9) 
  

  

  Caecum 
  Cooperi 
  Carpenter, 
  1864, 
  p. 
  612, 
  655; 
  Reprint, 
  p. 
  98, 
  141; 
  1866, 
  California 
  Acad. 
  

   Sci., 
  Proc, 
  vol. 
  Ill, 
  p. 
  216; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  Geol. 
  Sur. 
  California, 
  p. 
  28 
  

   Not 
  Caecum 
  cooperi 
  S. 
  Smith, 
  1862, 
  Ann. 
  Lye. 
  Nat. 
  Hist., 
  New 
  York, 
  p. 
  154, 
  168 
  

  

  