﻿NO. 
  1139. 
  DEEP-WATER 
  MOLLVSCA—VEIiRILL 
  AND 
  BUSH. 
  837 
  

  

  CAMPTONECTES 
  GRCENLANDICA 
  (Sowerby) 
  Verrill. 
  

  

  (Plate 
  LXXXV, 
  fig. 
  7.) 
  

  

  Pecten 
  gmnJandicus 
  Sowerby, 
  Thesaurus 
  Concbyliomra, 
  Pt. 
  ii, 
  p. 
  57, 
  pi. 
  xiii, 
  fig. 
  

  

  40, 
  1842.— 
  Hani^ey, 
  K'ccciit 
  Shells, 
  p. 
  274, 
  1842 
  to 
  1856.— 
  Jeffreys, 
  Aim. 
  and 
  

  

  Mai--. 
  Nat. 
  Hi.story, 
  p. 
  231, 
  1877. 
  

   Pecien 
  f/roiilandiciis 
  G. 
  O. 
  Sars, 
  Moll. 
  Reg. 
  Aret. 
  Norveg., 
  p. 
  23, 
  jil. 
  2, 
  figs. 
  4, 
  

  

  a-c, 
  1878. 
  

   Pecten 
  graniandicim 
  .Jeffreys, 
  Proc. 
  Zool. 
  Soc. 
  Loudon, 
  p. 
  560,1879. 
  — 
  Verrill, 
  

  

  Check-list, 
  p. 
  26, 
  1879. 
  

   Pecten 
  grUiilandims 
  Verrill, 
  Traus. 
  Coun. 
  Acad., 
  V, 
  p. 
  581, 
  1882. 
  

   Pecien 
  groenlandicus 
  Locard, 
  Campagne 
  du 
  Caudan, 
  Auuales 
  de 
  I'Uuivei'sitt' 
  de 
  

  

  Lyou, 
  p. 
  217, 
  1896. 
  

   Campfovectes 
  f/roenlandlca 
  Verrill, 
  Trans. 
  Coun. 
  Acad., 
  X, 
  pp. 
  82, 
  91, 
  1897. 
  

  

  The 
  shell 
  is 
  rounded, 
  iiiequivalved, 
  very 
  thin, 
  hyaline, 
  nearly 
  smootb, 
  

   often 
  with 
  a 
  violet 
  iridescence 
  when 
  fresh. 
  The 
  left 
  valve 
  is 
  covered, 
  

   even 
  from 
  the 
  nucleus, 
  with 
  fine 
  microscopic 
  cauiptonectes 
  sculpture, 
  in 
  

   the 
  form 
  of 
  thin, 
  raised, 
  divergent 
  riblets, 
  more 
  or 
  less 
  irregular 
  and 
  

   wavy, 
  most 
  visible 
  by 
  translucency. 
  The 
  left 
  valve 
  sometimes 
  has, 
  also, 
  

   tine 
  radial 
  stria' 
  and 
  delicate 
  lines 
  of 
  growth. 
  The 
  margins 
  are 
  thin 
  and 
  

   smooth, 
  that 
  of 
  the 
  right 
  valve 
  turns 
  up 
  a 
  little 
  against 
  the 
  other, 
  which 
  

   is 
  larger, 
  and 
  the 
  valves 
  close 
  very 
  tightly, 
  so 
  that 
  anteriorly 
  there 
  is 
  

   ^•carcely 
  any 
  visible 
  gape, 
  even 
  at 
  the 
  byssal 
  notch 
  or 
  at 
  the 
  end 
  of 
  the 
  

   auricle. 
  The 
  byssal 
  notch 
  is 
  well-marked 
  and 
  the 
  pectinidial 
  teeth 
  are 
  

   small 
  and 
  few. 
  The 
  byssus 
  is 
  probably 
  very 
  slender. 
  The 
  auricles 
  are 
  

   not 
  oblique 
  and 
  are 
  nearly 
  equal. 
  The 
  hinge-plate 
  is 
  very 
  thin; 
  the 
  

   single 
  longitudinal 
  ridge 
  is 
  scarcely 
  visible. 
  

  

  A 
  row 
  of 
  six 
  or 
  seven 
  ocelli 
  can 
  be 
  seen 
  through 
  the 
  shell 
  in 
  alcoholic 
  

   specimens. 
  

  

  xV 
  few 
  live 
  specimens 
  were 
  dredged 
  by 
  the 
  United 
  States 
  Fish 
  Com- 
  

   mission 
  at 
  four 
  stations, 
  off 
  [N^ewfoundland 
  Banks, 
  in 
  130 
  to 
  22-1 
  fathoms, 
  

   between 
  N. 
  lat. 
  47° 
  40', 
  W. 
  long. 
  47° 
  35' 
  30", 
  and 
  N. 
  lat. 
  44° 
  46' 
  30", 
  

   W. 
  long. 
  59^ 
  55' 
  45", 
  1884-188G. 
  It 
  is 
  also 
  known 
  from 
  the 
  Arctic 
  

   Ocean 
  and 
  off 
  northern 
  Europe. 
  

  

  CYCLOPECTEN 
  NANUS 
  Verrill 
  and 
  Bush. 
  

  

  (Plate 
  LXXXV, 
  figs. 
  2-4.) 
  

  

  Cyclopecten 
  nanus 
  Verrill 
  and 
  BrsH, 
  in 
  Veri;ill, 
  Traus. 
  Conn. 
  Acad., 
  X, 
  pp. 
  85, 
  

   92, 
  pi. 
  XVI, 
  figs. 
  12-12(', 
  1897. 
  

  

  Shell 
  small, 
  the 
  breadth 
  and 
  height 
  about 
  equal, 
  the 
  valves 
  nearly 
  

   equal 
  in 
  size 
  and 
  convexity. 
  Dorsal 
  hinge-margin 
  rather 
  long 
  and 
  

   straight; 
  auricles 
  relatively 
  large 
  and 
  broad, 
  both 
  ends 
  in 
  the 
  left 
  valve 
  

   subtruncated 
  or 
  a 
  little 
  convex 
  and 
  forming 
  nearly 
  a 
  right 
  angle 
  with 
  

   the 
  dorsal 
  margin, 
  and 
  having 
  a 
  small 
  incurved 
  notch, 
  well 
  differen- 
  

   tiated 
  from 
  the 
  body 
  of 
  the 
  shell. 
  In 
  the 
  right 
  valve 
  the 
  anterior 
  

   auricle 
  is 
  narrow, 
  somewhat 
  more 
  elongated, 
  obtusely 
  rounded 
  at 
  the 
  

  

  