﻿EEVISIOK 
  OF 
  THE 
  DEEP-WATER 
  MOLLUSCA 
  OF 
  THE 
  

   ATLANTIC 
  COAST 
  OP 
  NOKTH 
  AMERICA, 
  WITH 
  DE- 
  

   SCRIPTIONS 
  OF 
  NEW 
  GENERA 
  AND 
  SPECIES. 
  

  

  PART 
  I.— 
  BIVALVIA. 
  

  

  By 
  Addison 
  E. 
  Verrill, 
  

  

  Professor 
  of 
  Zoology 
  in 
  Yale 
  University 
  

   aud 
  

  

  Katharine 
  J. 
  Bush, 
  

  

  Assistant 
  in 
  Peabody 
  Mnseum 
  of 
  Yale 
  University. 
  

  

  This 
  article 
  is 
  not 
  intended 
  as 
  a 
  review 
  of 
  all 
  the 
  known 
  species 
  

   found 
  oft' 
  our 
  coasts. 
  It 
  is 
  preliminary 
  to 
  a 
  much 
  more 
  extensive 
  

   report, 
  in 
  which 
  full 
  details 
  of 
  the 
  distribution 
  of 
  all 
  the 
  species 
  col- 
  

   lected 
  will 
  be 
  given, 
  aud 
  for 
  which 
  the 
  detailed 
  tables 
  have 
  been 
  pre- 
  

   pared, 
  giving 
  every 
  station 
  for 
  each 
  species, 
  with 
  its 
  position, 
  depth, 
  

   temperature, 
  character 
  of 
  the 
  bottom, 
  etc. 
  

  

  Many 
  of 
  the 
  larger 
  and 
  more 
  prominent 
  si>ecies 
  were 
  described 
  and 
  

   figured 
  by 
  the 
  senior 
  author 
  several 
  years 
  ago 
  in 
  various 
  papers 
  pub- 
  

   lished 
  in 
  the 
  Transactions 
  of 
  the 
  Connecticut 
  Academy 
  and 
  elsewhere. 
  

   The 
  smaller 
  and 
  more 
  difticult 
  species 
  were 
  put 
  aside 
  at 
  that 
  time, 
  for 
  

   more 
  careful 
  study, 
  and 
  are 
  now 
  presented. 
  

  

  The 
  families 
  that 
  are 
  most 
  fully 
  treated 
  in 
  this 
  article 
  are 
  the 
  Ledidee, 
  

   Cuspidarida^, 
  Diplodontidtie, 
  and 
  Pectinidjie. 
  These 
  include 
  a 
  very- 
  

   large 
  number 
  of 
  deep-sea 
  species 
  in 
  every 
  region, 
  and 
  their 
  species 
  are 
  

   often 
  very 
  difticult 
  to 
  distinguish 
  without 
  long 
  and 
  patient 
  microscopic 
  

   study 
  and 
  direct 
  comparison 
  of 
  large 
  series 
  of 
  specimens 
  from 
  various 
  

   localities. 
  

  

  The 
  present 
  article 
  is 
  intended 
  to 
  give 
  some 
  of 
  the 
  results 
  of 
  studies 
  

   of 
  this 
  kind, 
  made 
  during 
  several 
  years, 
  of 
  the 
  large 
  series 
  of 
  speci- 
  

   mens 
  dredged 
  by 
  the 
  United 
  States 
  Fish 
  Commission 
  olf 
  our 
  coasts 
  

   from 
  1871 
  to 
  1887, 
  together 
  with 
  those 
  previously 
  dredged 
  by 
  the 
  senior 
  

   author 
  in 
  the 
  same 
  region. 
  

  

  Proceedings 
  U. 
  S. 
  National 
  Museum^ 
  Vol. 
  XX— 
  No. 
  1139. 
  

  

  