﻿NO. 
  1139. 
  DEEP-WATER 
  MOLLUSCA—VERRILL 
  AND 
  BUSH. 
  839 
  

  

  CYCLOPECTEN 
  LEPTALEUS 
  Verrill. 
  

   (Plate 
  LXXXV, 
  lig. 
  1.) 
  

  

  Pecten 
  lepfaleus 
  Vehkill, 
  Trans. 
  Conu. 
  Acad., 
  V, 
  pp. 
  232, 
  281, 
  1882; 
  Expl. 
  Alba- 
  

   tross, 
  Report 
  U. 
  S. 
  Com. 
  Fish 
  ami 
  Fisheries 
  for 
  1883, 
  p. 
  577, 
  1885. 
  — 
  Dall, 
  

   Hull. 
  Mils. 
  Comp. 
  Zool., 
  XII, 
  p. 
  221, 
  1886. 
  

  

  Ps('udamitsinm 
  leptalens 
  Dall, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  37, 
  p. 
  34, 
  1889. 
  

  

  Ciiclopecten 
  leplahus 
  Vkrhill, 
  Traus. 
  Conu. 
  Acad., 
  X, 
  pp. 
  85, 
  92, 
  1897. 
  

  

  Mr. 
  Dall 
  lias 
  expressed 
  a 
  doubt 
  as 
  to 
  this 
  species 
  being- 
  distinct 
  

   from 
  Pecten 
  imhrifer 
  Loveu, 
  tberetbre 
  a 
  very 
  much 
  enlarged 
  tigiire 
  of 
  

   tbe 
  shell 
  is 
  here 
  introduced 
  for 
  comparison. 
  

  

  In 
  addition 
  to 
  the 
  published 
  description, 
  it 
  should 
  be 
  stated 
  that 
  the 
  

   concentric 
  lines 
  are 
  somewhat 
  thickened 
  and 
  elevated, 
  even 
  where 
  

   thinnest, 
  and 
  that 
  the 
  beaded 
  character 
  is 
  quite 
  unlike 
  anything' 
  found 
  

   on 
  C. 
  imhrifer, 
  or 
  allied 
  species. 
  The 
  beads 
  are 
  closely 
  arranged, 
  

   elliptical 
  in 
  form, 
  and 
  most 
  elevated 
  at 
  the 
  center, 
  the 
  elevation 
  being 
  

   often 
  greater 
  than 
  the 
  diameter 
  j 
  the 
  summit 
  is 
  smooth 
  and 
  glassy, 
  so 
  that 
  

   when 
  viewed 
  from 
  above, 
  under 
  a 
  lens, 
  they 
  often 
  a.pi)ear 
  to 
  have 
  a 
  cen- 
  

   tral 
  cavity. 
  The 
  radial 
  lines 
  are 
  comparatively 
  very 
  thin 
  and 
  delicate, 
  

   and 
  not 
  visible, 
  excej^t 
  when 
  considerably 
  magnified. 
  The 
  beaks 
  are 
  

   more 
  acute 
  than 
  in 
  C. 
  imhrifer, 
  and 
  the 
  nucleus 
  smaller 
  and 
  smoother. 
  

  

  Two 
  live 
  specimens, 
  station 
  2109, 
  off 
  Cape 
  Hatteras, 
  ISTorth 
  Carolina, 
  

   in 
  142 
  fathoms, 
  1883. 
  

  

  CYCLOPECTEN 
  PUSTULOSUS 
  Verrill. 
  

   (Plate 
  LXXXV, 
  figs. 
  5, 
  6, 
  10, 
  11.) 
  

  

  Pecten 
  jiust 
  III 
  08)18 
  Verrill, 
  Auier. 
  ,Jourii, 
  Science, 
  V, 
  p. 
  14, 
  1873; 
  Trans. 
  Conn. 
  

  

  Acad., 
  Ill, 
  p. 
  50, 
  1874, 
  

   Pecten 
  hoski/nsi 
  var, 
  piistulosus 
  Verrill, 
  Trans, 
  Conn. 
  Acad., 
  V, 
  J). 
  581, 
  pi. 
  xlii, 
  

  

  figs. 
  22, 
  22a, 
  1882 
  (not 
  pi, 
  xliv, 
  fig, 
  11), 
  Not 
  Pecten 
  hoskynsi 
  G. 
  O. 
  Saks. 
  

   Pecten 
  pnstitlosiis 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  VI, 
  p. 
  261 
  (p. 
  281 
  in 
  part), 
  1884; 
  

  

  Expl. 
  Alhaiross, 
  Report 
  U. 
  S. 
  Com. 
  Fish 
  and 
  Fisheries 
  for 
  1883, 
  p. 
  557 
  (in 
  

  

  part), 
  pi. 
  XXXI, 
  figs. 
  142a, 
  h, 
  1885. 
  

   Pecten 
  imhrifer 
  Dall, 
  Bull. 
  Miis. 
  Comp, 
  Zotil., 
  XII, 
  p. 
  220 
  (in 
  part), 
  (not 
  pi. 
  iv, 
  

  

  figs, 
  4(r, 
  4/*), 
  1^86; 
  Bull, 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  37, 
  p. 
  34 
  (in 
  part), 
  pi. 
  lxiv, 
  

  

  figs. 
  142fl, 
  h, 
  1889 
  (not 
  j)!. 
  iv, 
  figs, 
  4rt, 
  ib). 
  Not 
  Pecten 
  imbrifer 
  Loykn. 
  

   Cyclopecfen 
  piistiilosus 
  Vkrrill 
  Trans. 
  Conn. 
  Acad., 
  X, 
  pp. 
  70, 
  83, 
  92, 
  ])1. 
  xix, 
  

  

  figs, 
  3, 
  4, 
  1897. 
  

  

  This 
  species 
  has 
  been 
  referred 
  to 
  Propeamusium 
  hosJcynsi 
  by 
  Jef- 
  

   freys, 
  and 
  to 
  Pecten 
  {Ci/clopecten) 
  imhrifer 
  by 
  Dall. 
  It 
  never 
  has 
  the 
  

   internal 
  ribs, 
  like 
  the 
  former, 
  which 
  it 
  resembles 
  in 
  sculpture. 
  From 
  

   the 
  latter, 
  as 
  originally 
  described 
  by 
  Loven, 
  and 
  redescribed 
  and 
  

   hgured 
  by 
  G. 
  O. 
  Sars, 
  it 
  differs 
  especially 
  in 
  the 
  character 
  of 
  the 
  orna- 
  

   mentation 
  of 
  the 
  left 
  valve. 
  The 
  Scandinavian 
  form, 
  according 
  to 
  

   these 
  authors, 
  has 
  the 
  vesicles 
  much 
  less 
  crowded 
  in 
  each 
  radial 
  row 
  

   and 
  subconical 
  and 
  mucronate 
  in 
  form; 
  while 
  in 
  ours 
  they 
  are 
  usually 
  

  

  