﻿58 
  PROCEEDINGS 
  OF 
  THE 
  CALIFORNIA 
  

  

  facts, 
  and 
  to 
  describe 
  some 
  of 
  the 
  more 
  remarkable 
  forms 
  which 
  have 
  thus 
  come 
  

   under 
  my 
  notice. 
  I 
  have 
  already 
  given 
  to 
  the 
  Academy 
  preliminary 
  descriptions 
  

   of 
  a 
  few 
  of 
  the 
  species 
  which 
  appear 
  to 
  have 
  been 
  hitherto 
  unknown, 
  and 
  this 
  

   paper 
  contains 
  additional 
  material 
  of 
  the 
  same 
  kind, 
  though 
  my 
  time 
  has 
  been 
  

   so 
  much 
  engaged 
  by 
  other 
  and 
  more 
  pressing 
  duties, 
  that 
  a 
  very 
  large 
  amount 
  

   of 
  work 
  of 
  this 
  kind 
  still 
  remains 
  unfinished. 
  

  

  In 
  the 
  matter 
  of 
  distribution 
  it 
  has 
  been 
  pretty 
  well 
  demonstrated 
  by 
  our 
  re- 
  

   searches 
  that 
  three 
  faunas 
  come 
  together 
  and 
  are 
  more 
  or 
  less 
  intermingled 
  in 
  the 
  

   region 
  between 
  Unalashka 
  and 
  the 
  Shumagins. 
  The 
  Shumagin 
  group 
  of 
  islands, 
  

   jutting 
  out 
  from 
  the 
  main 
  land 
  and 
  deflecting 
  the 
  coast 
  current 
  more 
  or 
  less 
  to 
  

   the 
  southward 
  off 
  shore, 
  acts 
  toward 
  the 
  Oregonian 
  fauna 
  (which 
  1 
  extend 
  from 
  

   Monterey 
  to 
  the 
  Shumagins), 
  as 
  Cape 
  Cod 
  on 
  the 
  east 
  coast 
  of 
  North 
  America 
  

   does 
  to 
  the 
  fauna 
  which 
  characterizes 
  the 
  coasts 
  of 
  the 
  Middle 
  and 
  Southern 
  

   States. 
  

  

  In 
  this 
  group 
  many 
  of 
  the 
  characteristic 
  animals 
  of 
  the 
  Oregonian 
  fauna, 
  

   such 
  as 
  Mylilus 
  calif 
  ornicus, 
  Purpura 
  lactuca, 
  Amphissa 
  corrugata, 
  Mara 
  var- 
  

   iegata 
  and 
  Petricola 
  cardilokles, 
  attain 
  their 
  most 
  western 
  limit. 
  The 
  Arctic 
  

   fauna 
  which 
  characterizes 
  the 
  shallow 
  waters 
  of 
  Bering 
  Sea 
  and 
  the 
  Arctic 
  

   Ocean, 
  is 
  well 
  represented 
  by 
  forms 
  of 
  Aslarte, 
  Buccinum 
  glaciale, 
  cynneum 
  and 
  

   ciliahnn, 
  Scalaria 
  gronlandicum, 
  Cardium 
  islandkurUf 
  Lacuna 
  vincta, 
  several 
  

   species 
  of 
  Bela, 
  Admete 
  and 
  Odostomia, 
  and 
  many 
  others 
  which 
  pass, 
  in 
  most 
  

   cases, 
  but 
  little 
  to 
  the 
  eastward. 
  The 
  typical 
  Aleutian 
  fauna, 
  which 
  was 
  (up 
  

   to 
  the 
  commencement 
  of 
  our 
  researches 
  in 
  1865) 
  almost 
  unknown, 
  is 
  character- 
  

   ized 
  here 
  by 
  such 
  species 
  as 
  Pecten 
  alaskensis, 
  Drillia 
  Kennicottii, 
  Rictocyma 
  

   mirahilis, 
  Voluti 
  Stearnsii, 
  Blaga^iella 
  aleutica, 
  Lilcrina 
  aleuitca, 
  Acmma 
  syba- 
  

   riiica, 
  peramabilis 
  and 
  Nacella 
  rosea, 
  Heliotropis 
  harpa, 
  and 
  other 
  forms 
  described 
  

   in 
  this 
  paper. 
  Much 
  remains 
  to 
  be 
  done 
  in 
  tracing 
  the 
  course 
  and 
  characteris- 
  

   tics 
  of 
  this 
  fauna 
  to 
  the 
  westward, 
  which 
  I 
  hope 
  during 
  the 
  coming 
  season 
  to 
  

   elucidate 
  to 
  some 
  extent. 
  The 
  following 
  species 
  possess 
  peculiar 
  interest 
  as 
  be- 
  

   ing 
  unlike 
  the 
  forms 
  which 
  would 
  be 
  expected 
  in 
  so 
  high 
  a 
  latitude, 
  and 
  as 
  an 
  

   earnest 
  of 
  what 
  may 
  be 
  looked 
  for 
  in 
  future 
  explorations. 
  

  

  Cancellariq, 
  {Trigonostoma) 
  unalgiMensis, 
  n. 
  s. 
  PI. 
  II, 
  fig. 
  1. 
  

  

  Shell 
  slender, 
  acute, 
  of 
  six 
  whorls, 
  with 
  a 
  minute, 
  smooth, 
  white 
  nucleus 
  and 
  

   solid 
  texture. 
  Color 
  whitish 
  with 
  traces 
  of 
  a 
  nut-brown 
  epidermis. 
  Sculpture 
  

   of 
  strong 
  revolving 
  ribs, 
  of 
  which 
  the 
  posterior 
  three 
  are 
  crossed 
  by 
  rather 
  strong 
  

   transverse 
  riblets 
  which 
  rise 
  into 
  beaded 
  nodules 
  on 
  the 
  intersections. 
  The 
  

   whorls 
  are 
  turrited 
  by 
  the 
  prominence 
  of 
  the 
  posterior 
  revolving 
  rib, 
  between 
  

   which 
  and 
  the 
  suture 
  the 
  transverse 
  riblets 
  are 
  oblique 
  and 
  rather 
  strong. 
  Three 
  

   of 
  the 
  revolving 
  ridges 
  are 
  apparent 
  on 
  the 
  upper 
  whorls 
  aiid 
  seven 
  on 
  the 
  last 
  

   whorl. 
  Aperture 
  about 
  two-fifths 
  the 
  whole 
  length, 
  white, 
  with 
  a 
  pink 
  throat, 
  • 
  

   and 
  the 
  outward 
  lip 
  somewhat 
  thickened 
  and 
  internally 
  grooved, 
  corresponding 
  

   with 
  the 
  external 
  ridges, 
  which 
  are 
  also 
  apparent 
  on 
  the 
  inner 
  lip. 
  Canal 
  short, 
  

   'straight, 
  shallow 
  and 
  rather 
  narrow. 
  Twu 
  or 
  three 
  plicae 
  on 
  the 
  columella. 
  

   Animal 
  whitish 
  with 
  no 
  operculum. 
  Lon., 
  0.75 
  in.; 
  lat., 
  0.3 
  in.; 
  defi. 
  35°. 
  

  

  