﻿NO. 
  1139. 
  DEEP-WATEB 
  MOLLUSCA—VEBBILL 
  AND 
  BUSH. 
  805 
  

  

  CUSPIDARIA 
  PELLUCIDA 
  (Stimpson). 
  

   (Plates 
  LXXV, 
  fig. 
  8; 
  LXXVI, 
  fig. 
  8.) 
  

  

  Xeara 
  pell 
  II 
  cid 
  a 
  STiyiPSO^;, 
  Invert. 
  Grand 
  Manan, 
  p. 
  21, 
  pi. 
  i, 
  fig. 
  13, 
  1853. 
  — 
  

   Gould, 
  Invert. 
  Massachusetts 
  (2(1 
  ed.), 
  p. 
  (il, 
  fig. 
  378, 
  1870. 
  — 
  Veukill, 
  

   Check-list, 
  p. 
  24, 
  1879. 
  

  

  Nea'ra 
  sp. 
  Yerrill, 
  Expl. 
  Alhatross, 
  Report 
  U. 
  S. 
  Com. 
  Fish 
  and 
  Fisheries 
  for 
  

   1883, 
  p. 
  574, 
  1885. 
  

  

  Not 
  Ne(vra 
  ohesa 
  Lovex. 
  

  

  Shell 
  small, 
  much 
  swollen, 
  with 
  a 
  strougly 
  tapered, 
  somewhat 
  pro- 
  

   duced 
  rostrum. 
  Umbos 
  relatively 
  large 
  and 
  prominent, 
  beaks 
  minute, 
  

   strongly 
  incurved. 
  The 
  anterior 
  portion 
  is 
  broadly 
  and 
  evenly 
  rounded, 
  

   the 
  margin 
  forming 
  nearly 
  a 
  semicircle, 
  with 
  the 
  dorsal 
  margin 
  strongly 
  

   convex 
  and 
  excurved, 
  rising 
  nearlj- 
  as 
  high 
  as 
  the 
  umbos; 
  the 
  ventral 
  

   margin 
  is 
  broadly 
  rounded 
  but 
  distinctly 
  incurved 
  at 
  the 
  base 
  of 
  the 
  

   rostrum 
  which 
  is 
  rather 
  narrow 
  distally, 
  obtusely 
  rounded 
  at 
  the 
  tip 
  

   and 
  slightly 
  upturned; 
  the 
  postero 
  dorsal 
  margin 
  slopes 
  considerably, 
  

   is 
  nearly 
  straight 
  at 
  first 
  but 
  becomes 
  slightly 
  concave 
  on 
  the 
  rostrum. 
  

   External 
  surface 
  nearly 
  smooth 
  but 
  usually 
  showing 
  more 
  or 
  less 
  prom- 
  

   inent 
  lines 
  of 
  growth, 
  most 
  distinct 
  on 
  the 
  distal 
  ])art 
  of 
  the 
  rostrum 
  

   which 
  is 
  destitute 
  of 
  a 
  distinct 
  diagonal 
  line. 
  The 
  right 
  valve 
  has 
  a 
  

   short, 
  very 
  prominent, 
  strongly 
  curved 
  lateral 
  tooth 
  rising 
  close 
  to 
  the 
  

   beak, 
  the 
  most 
  prominent 
  part 
  being 
  near 
  the 
  proximal 
  end 
  which 
  rises 
  

   rather 
  abruptly 
  from 
  the 
  very 
  minute 
  cartilage 
  plate 
  from 
  which 
  it 
  is 
  

   not 
  separated 
  by 
  a 
  notch; 
  just 
  in 
  front 
  of 
  the 
  beak, 
  the 
  hinge-margin 
  

   is 
  distinctly 
  thickened, 
  sinuous, 
  and 
  a 
  little 
  prominent, 
  forming 
  a 
  sort 
  

   of 
  tooth, 
  separated 
  from 
  the 
  lateral 
  tooth 
  only 
  by 
  the 
  minute 
  sunken 
  

   cartilage-plate; 
  the 
  left 
  valve 
  also 
  has 
  a 
  slight, 
  sinuous 
  thickening 
  of 
  

   the 
  margin 
  in 
  front 
  of 
  the 
  cartilage 
  plate. 
  

  

  Length 
  of 
  one 
  of 
  the 
  largest 
  specimens, 
  4.5 
  mm,; 
  height, 
  3 
  mm.; 
  

   breadth, 
  3 
  mm.; 
  beak 
  to 
  end 
  of 
  rostrum, 
  3 
  mm.; 
  beak 
  to 
  anterior 
  end, 
  

   2.5 
  mm. 
  

  

  This 
  species 
  has 
  been 
  taken 
  at 
  Eastport 
  Harbor; 
  Bay 
  of 
  Fundy, 
  near 
  

   Grand 
  Manan 
  Island; 
  and 
  at 
  about 
  twenty-one 
  stations 
  between 
  N. 
  

   lat. 
  470 
  40', 
  W.. 
  long. 
  47° 
  35' 
  30", 
  and 
  N. 
  lat. 
  35° 
  14' 
  20", 
  W. 
  long. 
  

   740 
  59' 
  10", 
  in 
  52 
  to 
  516 
  fathoms, 
  1868-1886. 
  

  

  The 
  specimens 
  here 
  described 
  are 
  from 
  the 
  Bay 
  of 
  Fundy, 
  near 
  

   Grand 
  Manan 
  Island 
  and 
  Eastport 
  Harbor, 
  very 
  near 
  the 
  locality 
  

   where 
  Doctor 
  Stimpson's 
  types 
  were 
  obtained. 
  In 
  former 
  articles 
  we 
  

   have 
  united 
  this 
  species 
  with 
  G. 
  ohesa 
  (Loven). 
  A 
  careful 
  reexam- 
  

   ination 
  of 
  a 
  large 
  series 
  of 
  specimens 
  of 
  both 
  forms 
  has 
  convinced 
  us 
  

   that 
  they 
  are 
  distinct 
  but 
  closely 
  related 
  species. 
  In 
  C. 
  obesa 
  the 
  

   anterior 
  portion 
  is 
  more 
  produced, 
  giving 
  tlie 
  shell 
  a 
  more 
  ovate 
  out- 
  

   line; 
  the 
  rostrum 
  is 
  broader 
  and 
  rather 
  more 
  upturned; 
  the 
  cartilage- 
  

   plate 
  is 
  relatively 
  much 
  larger, 
  more 
  ijrominent, 
  and 
  angular 
  at 
  the 
  

   edge, 
  and 
  in 
  the 
  right 
  valve 
  is 
  separated 
  from 
  the 
  lateral 
  tooth 
  by 
  an 
  

  

  