﻿DEEP-WATEB 
  MOLLUSCA—VEUBILL 
  AND 
  BUSH. 
  853 
  

  

  strongly 
  curved, 
  and 
  bears 
  about 
  nine 
  broad, 
  elevated, 
  strong, 
  trans- 
  

   verse 
  teeth 
  of 
  wliich 
  five 
  or 
  six 
  in 
  the 
  middle 
  are 
  much 
  larger 
  than 
  the 
  

   others; 
  above 
  these 
  the 
  outer 
  hinge 
  margin 
  is 
  somewhat 
  expanded 
  and 
  

   everted. 
  There 
  is 
  a 
  thin, 
  continuous 
  ligament 
  both 
  before 
  and 
  behind 
  

   the 
  beaks. 
  Epidermis 
  thiu, 
  pale 
  greenish 
  yellow. 
  The 
  inner 
  ventral 
  

   margin 
  is 
  thin 
  and 
  plain. 
  

  

  Length, 
  4.9 
  mm. 
  ; 
  height, 
  3.9 
  mm. 
  

  

  Some 
  of 
  the 
  smaller 
  specimens 
  have 
  a 
  narrower 
  and 
  less 
  thickened 
  

   hinge-jjlate 
  with 
  the 
  teeth 
  more 
  delicate 
  than 
  in 
  the 
  type. 
  

  

  Four 
  specimens, 
  at 
  four 
  stations, 
  between 
  X. 
  lat. 
  40°, 
  W. 
  long. 
  71° 
  

   14' 
  30", 
  and 
  N. 
  hit. 
  37° 
  8', 
  W. 
  long. 
  74° 
  33', 
  in 
  157 
  to 
  444 
  fathoms, 
  

   1881-1885. 
  

  

  This 
  species 
  has 
  some 
  resemblance 
  to 
  T. 
  ienuis, 
  but 
  it 
  is 
  much 
  less 
  

   oblique 
  and 
  more 
  elongated 
  in 
  form, 
  and 
  is 
  less 
  inequilateral,, 
  the 
  pos- 
  

   terior 
  end 
  not 
  being 
  subtruncated, 
  while 
  the 
  anterior 
  end 
  is 
  narrower, 
  

   relatively 
  shorter, 
  and 
  much 
  less 
  oblique. 
  The 
  hinge-margin 
  is 
  also 
  

   different; 
  the 
  teeth 
  are 
  fewer 
  and 
  nmch 
  stronger, 
  and 
  the 
  hinge-margin 
  

   much 
  broader, 
  while 
  the 
  chondrophore 
  is 
  smaller, 
  more 
  rounded, 
  much 
  

   less 
  oblique, 
  and 
  projects 
  freely 
  from 
  the 
  inner 
  hinge-margm 
  instead 
  of 
  

   being 
  united 
  closely 
  to 
  it. 
  

  

  It 
  also 
  bears 
  some 
  resemblance 
  in 
  form 
  to 
  JSiucula 
  pcrnamhucensis 
  

   Smith,^ 
  but 
  there 
  are 
  marked 
  differences 
  in 
  the 
  hinge 
  and 
  number 
  of 
  

   teeth. 
  

  

  NUCULA 
  GRANULOSA 
  Verrill. 
  

  

  (Plates 
  LXXXI, 
  fig. 
  2; 
  LXXXVIII, 
  liy. 
  8.) 
  

  

  Nucula 
  granulosa 
  Vekrill, 
  Traus. 
  Couu. 
  Acad., 
  \l, 
  p. 
  280, 
  1884; 
  Ex})!. 
  Allatross, 
  

   Report 
  U. 
  S. 
  Com. 
  Fish 
  aud 
  Fisheries 
  for 
  1883, 
  p. 
  576, 
  1885.— 
  Dall, 
  Bull. 
  U. 
  S. 
  

   Nat. 
  Mus., 
  Xo. 
  37, 
  p. 
  42, 
  1889. 
  

  

  Taken 
  at 
  about 
  sixteen 
  stations, 
  between 
  X, 
  lat. 
  41^ 
  53', 
  W. 
  long. 
  05° 
  

   35', 
  and 
  N. 
  lat. 
  38° 
  30' 
  3", 
  W. 
  long. 
  73° 
  6', 
  in 
  384 
  to 
  1,0G1 
  fathoms, 
  

   1880-1886. 
  

  

  NUCULA 
  VERRILLII 
  Dall. 
  

   (Plate 
  XCY, 
  fig. 
  10.) 
  

  

  Nuoda 
  irUjona 
  Verrill, 
  Traus. 
  Conn. 
  Acad., 
  VI, 
  p. 
  438, 
  1885 
  (u^>t 
  Bronn, 
  1849, 
  not 
  

   Segticnza, 
  1877). 
  

  

  Nucula 
  rerrillii 
  Dall, 
  Bull. 
  Mns. 
  Comp. 
  Zool., 
  XII, 
  p. 
  248,1886; 
  Bull. 
  U. 
  8. 
  Nat. 
  

   Mus., 
  No. 
  37, 
  p. 
  42, 
  1889 
  ; 
  Proc 
  U. 
  S. 
  Nat. 
  Mus., 
  XII, 
  p. 
  257, 
  pi. 
  xiv, 
  fig. 
  4, 
  1889.— 
  

   BrsH, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  XXIII, 
  pp. 
  240, 
  243, 
  pi. 
  i, 
  fig. 
  6, 
  1893. 
  

  

  Comparatively 
  few 
  specimens, 
  at 
  six 
  stations, 
  between 
  IST. 
  lat. 
  39^ 
  43' 
  

   45", 
  W. 
  long. 
  70° 
  7', 
  and 
  :N^. 
  lat. 
  3('P 
  47', 
  W. 
  long. 
  73° 
  9' 
  30", 
  in 
  1,140 
  to 
  

   1,825 
  fathoms, 
  1884-1886. 
  South 
  to 
  Yucatan, 
  in 
  430 
  to 
  1,685 
  fathoms.— 
  

   Dall. 
  

  

  ' 
  Report 
  Voy. 
  Challenger, 
  Zool. 
  Lamellibranchiata, 
  XIII, 
  p. 
  227, 
  pi. 
  xviii, 
  figs. 
  

   10-lOa, 
  1885. 
  

  

  