﻿60 
  PROCEEDINGS 
  OP 
  THE 
  CALIFORNIA 
  

  

  nal 
  surface 
  pinkish 
  white, 
  brilh'antly 
  pearly 
  where 
  eroded. 
  Lat. 
  of 
  largest 
  speci- 
  

   men, 
  0.85 
  iu.; 
  alt., 
  0.5 
  in.; 
  defl. 
  88°. 
  

  

  Habitat. 
  — 
  Iliuliuk 
  Harbor, 
  Captain's 
  Bay, 
  Unalashka 
  ; 
  and 
  larger 
  specimens 
  

   in 
  the 
  Akutan 
  Pass, 
  from 
  ten 
  to 
  sixty 
  fathoms, 
  on 
  stony 
  bottom. 
  Not 
  found 
  

   in 
  the 
  Shumagins. 
  

  

  This 
  species 
  is 
  more 
  flattened 
  than 
  any 
  species 
  except 
  M. 
  helicina, 
  which 
  it 
  

   somewhat 
  resembles 
  in 
  form, 
  though 
  more 
  carinated, 
  and 
  otherwise 
  widely 
  dif- 
  

   fering 
  in 
  character. 
  It 
  is 
  not 
  allied 
  to 
  any 
  West 
  American 
  species 
  known 
  to 
  

   me, 
  though 
  it 
  may 
  have 
  relations 
  in 
  some 
  Japanese 
  form. 
  It 
  is 
  a 
  thin 
  and 
  

   light 
  shell. 
  

  

  Volutopsis 
  Beringi, 
  Midd., 
  var. 
  regularis, 
  Dall. 
  PI. 
  II, 
  fig. 
  6. 
  

  

  Shell 
  of 
  four 
  whorls, 
  obtusely 
  fusiform, 
  and 
  with 
  the 
  last 
  whorl 
  somewhat 
  in- 
  

   flated. 
  Nucleus 
  mammillated, 
  whorls 
  smooth, 
  moderately 
  convex, 
  with 
  a 
  dis- 
  

   tinct, 
  though 
  not 
  channelled 
  suture. 
  Aperture 
  eleven-seventeenths 
  the 
  length 
  

   of 
  the 
  shell, 
  elongate, 
  produced 
  in 
  front, 
  with 
  the 
  outer 
  lip 
  moderately 
  thickened 
  

   and 
  the 
  inner 
  lip 
  without 
  callus. 
  Canal 
  almost 
  straight 
  ; 
  short, 
  narrow. 
  Lon., 
  

   1.8 
  in.; 
  lat., 
  0.9 
  in.; 
  defl. 
  65°. 
  Color 
  white, 
  or 
  light 
  pinkish. 
  

  

  Habitat. 
  — 
  Unalashka, 
  to 
  the 
  Shumagins 
  ; 
  rare. 
  This 
  form 
  may 
  be 
  a 
  distinct 
  

   species, 
  but 
  I 
  have 
  preferred 
  to 
  indicate 
  it 
  as 
  a 
  variety, 
  for 
  the 
  present. 
  It 
  dif- 
  

   fers 
  from 
  the 
  normal 
  form 
  in 
  being 
  smooth 
  and 
  regular, 
  without 
  the 
  lumps 
  or 
  

   irregular 
  ribs 
  which 
  are 
  common 
  in 
  the 
  V. 
  Beringi; 
  it 
  is 
  smaller 
  in 
  size, 
  when 
  

   adult, 
  by 
  one-half 
  ; 
  it 
  is 
  never 
  of 
  the 
  dark 
  livid 
  chestnut 
  color 
  which 
  invariably 
  

   characterizes 
  V. 
  Bet'ingi. 
  The 
  outer 
  lip 
  is 
  less 
  patulous, 
  the 
  canal 
  proportion- 
  

   ately 
  narrower, 
  and 
  the 
  aperture 
  shorter, 
  compared 
  with 
  the 
  whole 
  length 
  of 
  

   the 
  shell. 
  Moreover, 
  the 
  specimens 
  are 
  remarkably 
  uniform 
  in 
  their 
  charac- 
  

   ters, 
  and 
  the 
  V. 
  Beringi, 
  though 
  very 
  variable 
  as 
  a 
  whole, 
  is 
  equally 
  constant 
  

   in 
  the 
  differential 
  characters 
  alluded 
  to. 
  I 
  have 
  come 
  to 
  this 
  conclusion 
  only 
  

   after 
  a 
  careful 
  examination 
  of 
  over 
  a 
  hundred 
  specimens 
  of 
  V. 
  Beringi, 
  and 
  a 
  

   good 
  series 
  of 
  this 
  form. 
  The 
  former 
  is 
  much 
  more 
  common 
  in 
  the 
  localities 
  

   alluded 
  to. 
  

  

  In 
  Dunker's 
  portion 
  of 
  the 
  Novitates 
  Conchologica, 
  pp. 
  1-7, 
  1858, 
  and 
  plates 
  

   I 
  and 
  II, 
  a 
  number 
  of 
  species 
  are 
  described 
  and 
  figured 
  as 
  new, 
  and 
  stated 
  to 
  be 
  

   from 
  Sitka. 
  The 
  references 
  to 
  the 
  plates 
  are 
  erroneous 
  throughout, 
  as 
  pointed 
  

   out 
  by 
  Dr. 
  Carpenter, 
  and 
  the 
  names 
  on 
  the 
  plates 
  do 
  not 
  always 
  agree 
  with 
  

   those 
  in 
  the 
  text. 
  Of 
  the 
  six 
  species 
  described 
  here, 
  only 
  one 
  is 
  new. 
  As 
  the 
  

   paper 
  is 
  not 
  accessible 
  to 
  most 
  students, 
  I 
  here 
  give 
  the 
  corrected 
  synonymy 
  of 
  

   the 
  suppositious 
  species, 
  none 
  of 
  which 
  are 
  found 
  at 
  Sitka. 
  

  

  1. 
  BucciNUM 
  GLACiALE, 
  Stimpson. 
  (Mon. 
  Northern 
  Buccinums.) 
  

   j 
  Tritonium 
  carinatum, 
  Dkr., 
  p. 
  1, 
  pi. 
  2, 
  f. 
  3-4.= 
  

   ( 
  Tritonium 
  angulosum, 
  Moerch. 
  (on 
  plate.) 
  

   Tritonium 
  mmxhianum, 
  Dkr., 
  p. 
  2, 
  pi. 
  2, 
  f. 
  1-2. 
  

   Tritonium 
  rutilum, 
  Mcerch., 
  p. 
  3, 
  pi. 
  1, 
  f. 
  5-6. 
  

   Tritonium 
  rombergi, 
  Dkr., 
  p. 
  4, 
  pi. 
  2, 
  f. 
  5-6. 
  

  

  