﻿816 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.xx. 
  

  

  Family 
  VERTICORDID^. 
  

  

  VERTICORDIA 
  GRANULIFERA 
  (Verrill) 
  Dall. 
  

  

  (Plates 
  LXXXVII, 
  fig. 
  2; 
  XCV, 
  figs. 
  2, 
  3, 
  4.) 
  

  

  Pecchiolia 
  granulifera 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  VI, 
  pp. 
  434, 
  448, 
  450, 
  1885. 
  

   Verticordia 
  granifera 
  Dall, 
  Bull. 
  Mns, 
  Coinp. 
  Zool., 
  XII, 
  p. 
  286, 
  1886. 
  

   VerUcordia 
  granulifera 
  Dall, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No, 
  37, 
  p. 
  66, 
  1889. 
  

  

  In 
  addition 
  to 
  tlie 
  published 
  description, 
  it 
  should 
  be 
  stated 
  that 
  in 
  

   the 
  type-specimen 
  (No, 
  44838), 
  the 
  lunular 
  area 
  is 
  small, 
  deeply 
  sunken, 
  

   with 
  the 
  corresponding- 
  internal 
  margin 
  very 
  much 
  thickened, 
  forming 
  

   a 
  strong, 
  curved, 
  tooth-like 
  projection 
  having 
  a 
  rounded 
  summit, 
  reach- 
  

   ing 
  strongly 
  above 
  the 
  margin 
  of 
  the 
  shell 
  when 
  seen 
  in 
  a 
  profile 
  view 
  ; 
  

   behind 
  this, 
  directly 
  under 
  the 
  beak 
  and 
  beneath 
  the 
  overhanging 
  

   margin, 
  there 
  is 
  a 
  triangular 
  space 
  or 
  notch 
  for 
  the 
  recei)tion 
  of 
  the 
  

   prominent 
  tooth 
  of 
  the 
  opposite 
  valve; 
  this 
  is 
  followed 
  posteriorly 
  by 
  

   a 
  short, 
  triangular, 
  shelf 
  like 
  jirojection, 
  a 
  little 
  beneath 
  the 
  margin, 
  

   which 
  has 
  a 
  depression 
  on 
  its 
  upper 
  surface 
  for 
  the 
  reception 
  of 
  its 
  

   ligament 
  but 
  shows, 
  in 
  this 
  specimen, 
  no 
  notch 
  or 
  scar 
  corresi)onding 
  

   to 
  the 
  ossicle. 
  Directly 
  under 
  the 
  strongly 
  incurved 
  beak 
  there 
  is 
  a 
  

   slight, 
  thin 
  groove 
  in 
  which 
  the 
  front 
  part 
  of 
  the 
  ligament 
  was 
  attached. 
  

   The 
  postero-dorsal 
  edge 
  is 
  a 
  little 
  thickened 
  and 
  projects 
  inward 
  beyond 
  

   the 
  general 
  line 
  of 
  the 
  margin 
  ; 
  its 
  outer 
  surface 
  has 
  a 
  smooth, 
  slightly 
  

   excavated 
  groove, 
  extending 
  jiarallel 
  with 
  the 
  edge, 
  for 
  some 
  distance; 
  

   this 
  portion 
  was 
  overlapped 
  by 
  the 
  projecting 
  edge 
  of 
  the 
  opposite 
  

   valve. 
  

  

  A 
  very 
  large 
  specimen 
  (No. 
  78679) 
  from 
  station 
  2713, 
  which 
  measures 
  

   21 
  mm. 
  in 
  length, 
  22i 
  mm. 
  in 
  height, 
  and 
  10 
  mm. 
  in 
  thickness, 
  has, 
  in 
  

   the 
  right 
  valve, 
  directly 
  beneath 
  the 
  beak, 
  a 
  very 
  strong, 
  high, 
  curved, 
  

   pointed, 
  angular 
  tooth 
  attached 
  by 
  a 
  very 
  broad, 
  thick 
  base, 
  a 
  con- 
  

   siderable 
  distance 
  within 
  the 
  margin. 
  Behind 
  the 
  ossicle, 
  well 
  within 
  

   and 
  nearly 
  parallel 
  with 
  the 
  margin 
  for 
  its 
  entire 
  length, 
  is 
  a 
  conspicu- 
  

   ous 
  shelf-like 
  ridge 
  against 
  which 
  the 
  projecting 
  edge 
  of 
  the 
  opposite 
  

   valve 
  rests. 
  The 
  ossicle 
  is 
  strong, 
  somewhat 
  rectilinear 
  in 
  outline, 
  

   with 
  the 
  posterior 
  end 
  deeply 
  forked, 
  the 
  inner 
  surface 
  strongly 
  con- 
  

   vex, 
  the 
  outer 
  strongly 
  concave, 
  with 
  thick, 
  somewhat 
  beveled 
  edges, 
  

   to 
  which 
  the 
  ligament 
  is 
  attached. 
  Interior 
  surface 
  somewhat 
  pearly. 
  

   Scars 
  and 
  pallial 
  line 
  not 
  very 
  clearly 
  defined. 
  

  

  But 
  four 
  specimens, 
  beside 
  the 
  type, 
  have 
  been 
  found 
  at 
  four 
  stations 
  

   between 
  N. 
  lat. 
  40o 
  9' 
  30", 
  W. 
  long. 
  67-^ 
  9', 
  and 
  N. 
  lat. 
  36° 
  47', 
  W. 
  long. 
  

   73^ 
  9' 
  30", 
  in 
  1,350 
  to 
  1,859 
  fathoms, 
  1884-1886. 
  

  

  