﻿174 
  MARINE 
  MOLLUSCA 
  DESCRIBED 
  BY 
  P. 
  P. 
  CARPENTER 
  

  

  Caecum 
  californicum 
  Dall, 
  1885, 
  U. 
  S. 
  Nat. 
  Mus., 
  Proc., 
  vol. 
  8, 
  p. 
  541 
  in 
  Orcutt, 
  new 
  name 
  

   for 
  C. 
  coopcri 
  Carpenter 
  not 
  Smith; 
  Tryox, 
  1886, 
  Man. 
  Conch., 
  vol. 
  VIII, 
  p. 
  219, 
  pi. 
  66, 
  

   fig. 
  65; 
  Keep, 
  1887, 
  West 
  Coast 
  Shells, 
  p. 
  73; 
  Dall, 
  1892, 
  Wagner 
  Free 
  Inst. 
  Sci. 
  

   Philadelphia, 
  Trans., 
  vol. 
  Ill, 
  pt. 
  Ill, 
  p. 
  299; 
  Arnold, 
  1903, 
  p. 
  297, 
  pi. 
  8, 
  fig. 
  6; 
  Dau,, 
  

   1921, 
  p. 
  149; 
  Oldroyd, 
  1927, 
  vol. 
  II, 
  pt. 
  Ill, 
  p. 
  44; 
  Grant 
  and 
  Gale, 
  1931, 
  p. 
  779; 
  Baily, 
  

   1935, 
  West 
  Coast 
  Shells 
  Keep, 
  p. 
  190, 
  fig. 
  167; 
  Keen, 
  1937, 
  p. 
  2,2; 
  Burch, 
  1945, 
  no. 
  54, 
  

   p. 
  38-40; 
  WooDRiNG, 
  Bramlette, 
  and 
  Kew, 
  1946, 
  U. 
  S. 
  Geol. 
  Sur., 
  Prop. 
  Paper 
  207, 
  

   p. 
  69; 
  Smith 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci., 
  Proc, 
  ser. 
  4, 
  vol. 
  XXVI, 
  p. 
  1%; 
  

   Abbott, 
  1954, 
  p. 
  147, 
  fig. 
  37g. 
  

  

  "Small, 
  with 
  30-40 
  sharp 
  narrow 
  rings." 
  [Carpenter, 
  1864b, 
  p. 
  655] 
  

  

  "C. 
  {AncUum) 
  t. 
  parva, 
  satis 
  tereti, 
  alba; 
  annulis 
  creliris 
  acutioribus, 
  angustis, 
  circ. 
  

   XXXIV-XXXVIII., 
  interstitiis 
  subconcavis 
  ; 
  septo 
  subungulato 
  ; 
  apice 
  obtuso, 
  baud 
  clevato, 
  

   margine 
  laterali 
  recto; 
  apertura 
  declivi, 
  parum 
  contracto 
  et 
  postice 
  expanso; 
  operculo? 
  

  

  "I^ng. 
  0.09, 
  lat. 
  0.025. 
  

  

  "Hab. 
  San 
  Diego 
  and 
  Catalina 
  Island, 
  8-10 
  fms. 
  18, 
  Cooper. 
  

  

  "Known 
  from 
  similar 
  Mazatlan 
  species 
  by 
  the 
  very 
  numerous 
  but 
  .separated 
  and 
  some- 
  

   what 
  sharp 
  ribs." 
  [Carpenter, 
  1866a, 
  p. 
  216] 
  

  

  The 
  syntypes 
  consist 
  of 
  two 
  specimens 
  on 
  the 
  original 
  Carpenter 
  glass 
  mounts 
  with 
  a 
  

   Carpenter 
  label, 
  "S. 
  Diego 
  Cooper." 
  The 
  specimens 
  are 
  well 
  preserved 
  and 
  measure 
  2 
  mm. 
  

   and 
  1.75 
  mm. 
  in 
  length, 
  respectively. 
  

  

  Syntypes. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  15719 
  (C. 
  cooperi 
  Carpenter) 
  

  

  Distribution. 
  — 
  Recent. 
  San 
  Diego, 
  California 
  (type) 
  ; 
  Monterey, 
  California 
  to 
  Lower 
  Cali- 
  

   fornia 
  (Dall). 
  Pleistocene. 
  California 
  (Arnold; 
  Oldroyd, 
  1925; 
  Grant 
  and 
  Gale; 
  Woodring, 
  

   Bramlette, 
  and 
  Kew) 
  Mexico 
  (Jordan, 
  1926) 
  

  

  Caecum 
  quadratum 
  Carpenter 
  

   Caecum 
  quadratum 
  Carpenter, 
  Berry, 
  1907, 
  Nautilus, 
  vol. 
  21, 
  no. 
  1, 
  p. 
  43 
  Monterey 
  

  

  Smith 
  and 
  Gordon 
  (1948) 
  doubt 
  the 
  identification 
  of 
  this 
  species 
  in 
  the 
  upper 
  California 
  

   fauna. 
  It 
  is 
  not 
  recorded 
  by 
  other 
  authors 
  from 
  that 
  region. 
  The 
  species 
  was 
  described 
  from 
  

   Mazatlan 
  by 
  Carpenter 
  (1857, 
  p. 
  322). 
  

  

  Genus 
  Micranellum 
  Bartscli, 
  1920 
  

  

  Micranellum 
  Bartsch, 
  1920, 
  Washington 
  Acad. 
  Sci., 
  Jour., 
  vol. 
  X, 
  p. 
  568 
  

  

  Type 
  species 
  by 
  original 
  designation. 
  Caecum 
  crehricinctum 
  Carpenter, 
  1864b, 
  p. 
  655 
  ; 
  1866, 
  

  

  California 
  Acad. 
  Sci., 
  Proc, 
  vol. 
  Ill, 
  p. 
  215. 
  Living. 
  Monterey, 
  California, 
  to 
  Lower 
  

  

  California, 
  in 
  shallow 
  water. 
  (PI. 
  20, 
  figs. 
  10, 
  11, 
  11 
  A) 
  

  

  C. 
  aJterum 
  Meyer 
  of 
  the 
  Jackson 
  Eocene, 
  southern 
  United 
  States 
  appears 
  to 
  be 
  a 
  typical 
  

   Micranellum. 
  This 
  would 
  lower 
  the 
  range 
  of 
  the 
  genus 
  as 
  given 
  by 
  authorities 
  (Wenz, 
  1939, 
  

   p. 
  683). 
  Miocene-Recent. 
  

  

  Micranellum 
  was 
  proposed 
  by 
  Bartsch 
  as 
  a 
  genus 
  of 
  the 
  Caecidae. 
  Theile 
  (1931, 
  p. 
  188) 
  

   and 
  Wenz 
  (1939, 
  p. 
  683) 
  limit 
  the 
  group 
  to 
  sectional 
  subgeneric 
  rank 
  respectively. 
  

  

  Micranellum 
  crebricinctum 
  (Carpenter) 
  

   (PI. 
  20, 
  figs, 
  in, 
  11. 
  IIA) 
  

  

  Caecum 
  crebricinctum 
  Carpenter, 
  1864b, 
  p. 
  612, 
  655; 
  Reprint, 
  1872, 
  p. 
  98. 
  141; 
  1866, 
  Cali- 
  

   fornia 
  Acad. 
  Sci., 
  vol. 
  Ill, 
  p. 
  215; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  Geol. 
  Sur. 
  California, 
  

   p. 
  28; 
  Cooper, 
  1870, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  p. 
  6Z\ 
  Tryon, 
  1886, 
  vol. 
  VIII, 
  p. 
  218, 
  

   pi. 
  67, 
  figs. 
  71; 
  Keep, 
  1887, 
  West 
  Coast 
  Shells, 
  p. 
  7Z\ 
  Dall, 
  1892. 
  Wagner 
  Free 
  Inst. 
  

   Sci. 
  Philadelphia, 
  Trans., 
  vol. 
  Ill, 
  pt. 
  I, 
  p. 
  300. 
  Arnold, 
  1903, 
  p. 
  298, 
  pi. 
  VIII, 
  fig. 
  10 
  

  

  Caecum 
  magnum 
  "Stearns" 
  Tryon, 
  1886, 
  Man. 
  Conch., 
  vol. 
  VIII, 
  p. 
  219, 
  pi. 
  67, 
  fig. 
  83 
  fide 
  

   Dall, 
  1892; 
  Arnold, 
  1903, 
  p. 
  298, 
  pi. 
  VIII, 
  fig. 
  16 
  young 
  fide 
  Willett, 
  1937, 
  San 
  Diego 
  

   Soc 
  Nat. 
  Hist, 
  Trans., 
  vol. 
  VIII, 
  no. 
  30. 
  p. 
  399 
  

  

  Micranellian 
  crebricinctum 
  (Carpenter), 
  Bartsch, 
  1920, 
  Washington 
  Acad. 
  Sci., 
  Jour., 
  vol. 
  

   X, 
  p. 
  568; 
  Dall, 
  1921, 
  p. 
  149; 
  Oldroyd, 
  1927, 
  vol. 
  II, 
  pt. 
  Ill, 
  p. 
  45; 
  Grant 
  and 
  Gale, 
  

   1931, 
  p. 
  779; 
  Bailey, 
  1935, 
  West 
  Coast 
  Shells 
  (Keep), 
  p. 
  190; 
  Keen, 
  1937, 
  p. 
  40; 
  

   Burch, 
  1945, 
  no. 
  54, 
  p. 
  38, 
  40, 
  41 
  ; 
  Woodring, 
  Bramlette, 
  and 
  Kew, 
  1946, 
  U. 
  S. 
  Geol. 
  

   Sur., 
  Prof 
  Papers 
  207, 
  p. 
  69; 
  Smith 
  and 
  Gordon, 
  1948, 
  California 
  Acad. 
  Sci. 
  Proc, 
  

   ser. 
  4, 
  vol. 
  XXVI, 
  p. 
  196 
  

  

  Caecum 
  {Micranellum) 
  crebricinctum 
  Carpenter, 
  Abbott, 
  1954, 
  p. 
  147, 
  fig. 
  37 
  m 
  

  

  