﻿GASTROPODA 
  

  

  143 
  

  

  nucl. 
  iii. 
  lacvibus, 
  globosis, 
  vertice 
  mamillato; 
  norm. 
  v. 
  rotundatis, 
  fere 
  acqualibus, 
  plus 
  

   minusve 
  solutis, 
  suturis 
  subimpressis 
  ; 
  tota 
  superficie 
  tenue 
  spiraliter 
  striata; 
  striis 
  in 
  spira 
  

   majoribus, 
  circ. 
  viii. 
  distantibus, 
  minoribus 
  creberrimis 
  intercalantibus 
  ; 
  circa 
  basim 
  rotiui- 
  

   datam 
  circ. 
  x 
  majoribus, 
  contiguis, 
  minoribus 
  paucis; 
  apertura 
  circulari, 
  peritremati 
  continue, 
  

   solido, 
  ad 
  suturam 
  parum 
  callosam 
  appresso; 
  umbilico 
  nullo. 
  

  

  "Long. 
  0.23, 
  long. 
  .spir. 
  0.16, 
  lat. 
  0.09, 
  div. 
  12°. 
  

  

  "Hab. 
  Monterey, 
  20 
  fm. 
  45, 
  dead. 
  Cooper." 
  [Carpenter, 
  1866 
  a, 
  p. 
  217] 
  

  

  There 
  are 
  two 
  syntypes 
  of 
  this 
  species 
  in 
  the 
  U. 
  S. 
  National 
  Museum, 
  labeled 
  from 
  the 
  

   "Bay 
  of 
  Monterey 
  Cooper 
  type." 
  The 
  types 
  are 
  not 
  in 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  at 
  

   Philadelphia, 
  as 
  reported 
  by 
  Oldroyd 
  and 
  followed 
  by 
  Grant 
  and 
  Gale. 
  

  

  The 
  whole 
  surface 
  of 
  the 
  shell 
  is 
  covered 
  with 
  fine 
  spiral 
  ribs 
  with 
  equal 
  interspaces. 
  

   Between 
  some 
  of 
  the 
  spiral 
  ribs 
  there 
  are 
  microscopic 
  spiral 
  striae 
  ; 
  no 
  umbilicus 
  ; 
  round 
  en- 
  

   tire 
  aperture 
  with 
  the 
  margin 
  thick 
  and 
  flaring 
  below 
  the 
  umbilical 
  area. 
  Both 
  specimens 
  

   measure 
  5.5 
  mm. 
  height 
  and 
  2 
  + 
  mm. 
  greatest 
  diameter. 
  

  

  Although 
  this 
  species 
  was 
  briefly 
  described 
  in 
  1864, 
  Carpenter 
  gave 
  full 
  notes 
  in 
  1866. 
  

   The 
  type 
  locality 
  is 
  definitely 
  stated, 
  and 
  the 
  types 
  are 
  available. 
  Carpenter's 
  name 
  does 
  not 
  

   seem 
  to 
  be 
  a 
  homonym 
  of 
  F. 
  pupoidcs 
  Adams, 
  1860, 
  so 
  it 
  may 
  be 
  retained. 
  

  

  Syntypes. 
  — 
  U. 
  S. 
  National 
  Museum, 
  no. 
  14824 
  

  

  Distrilmtion. 
  — 
  Recent. 
  Monterey, 
  California 
  (type) 
  ; 
  Forrester 
  Island, 
  Alaska, 
  to 
  Panama 
  

   (Burch). 
  Pleistocene 
  (Grant 
  and 
  Gale; 
  Woodring, 
  Bramlette, 
  and 
  Kew) 
  

  

  Genus 
  Norrisia 
  Bayle, 
  1880 
  

  

  Norrisia 
  Bayle, 
  1880, 
  Jour, 
  de 
  Conchyl., 
  vol. 
  28, 
  p. 
  241 
  new 
  name 
  for 
  Trochiscus 
  Sowerby, 
  

   1838 
  not 
  of 
  Heyden, 
  1826 
  nor 
  of 
  Held, 
  1837 
  nor 
  of 
  Jakovlev, 
  1879, 
  for 
  references 
  see 
  

   Neave 
  1939-1940 
  

  

  Type 
  species 
  by 
  monotypy 
  and 
  original 
  designation 
  of 
  Norrisia, 
  Trochiscus 
  norrisii 
  Sowerby, 
  

   1838, 
  Mag. 
  Nat. 
  Hist., 
  vol. 
  2, 
  n.s. 
  p. 
  97. 
  Living. 
  Monterey, 
  California, 
  to 
  Cedros 
  Island, 
  

   Lower 
  California. 
  Pleistocene. 
  California 
  and 
  Mexico. 
  Baily, 
  1935, 
  West 
  Coast 
  Sliells 
  

   (Keep), 
  p. 
  156, 
  fig. 
  122; 
  Abbott, 
  1954, 
  pi. 
  18, 
  fig. 
  M 
  

  

  Norrisia 
  norrisii 
  (Sowerby) 
  

   Trochiscus 
  coni'exus 
  Carpenter 
  

  

  Trochiscus 
  convexus 
  Carpenter, 
  1864b, 
  p. 
  537, 
  652; 
  Reprint, 
  1872, 
  p. 
  23, 
  138; 
  1865, 
  Ann. 
  

   Mag. 
  Nat. 
  Hist., 
  vol. 
  XV, 
  p. 
  180; 
  Reprint, 
  1872, 
  p. 
  282; 
  Cooper, 
  1867, 
  Geog. 
  Cat. 
  Moll., 
  

   Geol. 
  Sur. 
  California, 
  p. 
  25; 
  Gabb, 
  1869, 
  Paleontology 
  California, 
  vol. 
  II, 
  p. 
  85 
  juvenile 
  

   Trochiscus 
  norrisii 
  Sowerby; 
  Cooper, 
  1870, 
  Amer. 
  Jour. 
  Conch., 
  vol. 
  VI, 
  p. 
  62; 
  Pilsbry, 
  

   1889, 
  Alan. 
  Conch., 
  vol. 
  XL 
  p. 
  276 
  under 
  Norrisia 
  norrisi; 
  Arnold, 
  1903, 
  p. 
  331 
  following 
  

   Gabb; 
  Grant 
  and 
  Gale, 
  1931, 
  p. 
  824 
  

  

  The 
  synonymy 
  is 
  not 
  intended 
  to 
  be 
  for 
  that 
  of 
  Norrisia 
  norrisii 
  (Sowerby). 
  (See 
  Grant 
  

  

  and 
  Gale, 
  1931, 
  p. 
  824) 
  

  

  "Small, 
  subturritted, 
  whorls 
  [sic] 
  swollen: 
  umbilicus 
  with 
  2 
  ribs, 
  the 
  outer 
  crenated." 
  

   [Carpenter, 
  1864b, 
  p. 
  652, 
  Trochiscus 
  conz^cxus] 
  

  

  "T. 
  testa 
  parva, 
  subelevata, 
  purpureo-fusca, 
  tenuiter 
  sculpta 
  ; 
  anfr. 
  nucl. 
  ? 
  sinistralibus, 
  

   vertice 
  quasi 
  decollate 
  ; 
  norm. 
  IV., 
  convexis, 
  suturis 
  impressis 
  ; 
  obtusissime 
  bicarinatis, 
  

   striolis 
  confertissimis, 
  minimis, 
  sub-obsoletis 
  cinctis 
  ; 
  umbilico 
  majore, 
  costis 
  duabus 
  cincto, 
  

   quarum 
  interior 
  acuta, 
  exterior 
  rotundata, 
  crenata 
  ; 
  apertura 
  circulari. 
  Long. 
  .15, 
  long. 
  spir. 
  

   .06, 
  lat. 
  .15, 
  div. 
  90°. 
  

  

  "Hab. 
  Monterey 
  {Jezvett). 
  

  

  "The 
  nuclear 
  whorls 
  in 
  this 
  unique 
  little 
  shell 
  and 
  in 
  the 
  typical 
  species 
  appear 
  sinistral, 
  

   as 
  in 
  Phoridae 
  and 
  Solariadae. 
  The 
  operculum 
  also 
  resembles 
  that 
  of 
  Solarium 
  rather 
  than 
  

   of 
  Trochus. 
  The 
  genus 
  may 
  prove 
  to 
  belong 
  to 
  the 
  Proboscidifers, 
  notwithstanding 
  its 
  

   nacreous 
  texture." 
  [Carpenter, 
  1865h, 
  p. 
  180 
  Trochiscus 
  convexus] 
  

  

  Type. 
  — 
  Not 
  found 
  

  

  Distribution. 
  — 
  Monterey, 
  California 
  (type 
  of 
  T. 
  convexus 
  Carpenter). 
  For 
  Norrisia 
  

   norrisii, 
  see 
  Dall 
  (1921, 
  p. 
  174). 
  

  

  "Trochiscus 
  Jewetti 
  Carpenter" 
  nomen 
  nudum 
  

   There 
  is 
  in 
  the 
  Carpenter 
  Collection 
  in 
  the 
  Redpath 
  Museum 
  a 
  specimen 
  (no. 
  2359) 
  

   labelled 
  "Trochiscus 
  Jewetti 
  Monterey 
  Jewett 
  type." 
  The 
  name 
  is 
  a 
  nomen 
  nudum. 
  The 
  speci- 
  

  

  