﻿NO. 
  1139. 
  DEEP-WATER 
  MOLLUSCA—VERBILL 
  AND 
  BUSH. 
  793 
  

  

  The 
  hiuge-raargin 
  in 
  the 
  right 
  valve 
  is 
  slightly 
  thickened 
  with 
  a 
  dis- 
  

   tiuct, 
  tootii-like 
  prominence 
  below 
  and 
  slightly 
  in 
  front 
  of 
  the 
  center 
  of 
  

   the 
  beak, 
  and 
  an 
  inner 
  fold 
  like 
  thickening 
  of 
  the 
  i)osterior 
  margin 
  to 
  

   support 
  the 
  ligament; 
  in 
  front 
  of 
  the 
  lunular 
  area 
  the 
  margin 
  is 
  con 
  

   vex 
  and 
  slightly 
  everted. 
  

  

  Length, 
  about 
  1.6 
  ram.; 
  height, 
  about 
  1.4 
  mm. 
  

  

  A 
  few 
  live 
  specimens 
  were 
  found 
  at 
  three 
  stations 
  between 
  N. 
  lat. 
  47° 
  

   40', 
  W. 
  long. 
  47° 
  35' 
  30", 
  and 
  :N^. 
  lat. 
  39° 
  54' 
  30", 
  W. 
  long. 
  70° 
  20', 
  in 
  

   206 
  to 
  499 
  fathoms, 
  1883-1886. 
  

  

  This 
  species 
  is 
  allied 
  to 
  C.ferruginosus 
  (Forbes), 
  from 
  which 
  it 
  differs 
  

   in 
  its 
  distinctly 
  produced 
  and 
  angulated 
  posterior 
  end, 
  and 
  longer 
  or 
  

   more 
  produced, 
  evenly 
  rounded 
  anterior 
  end. 
  It 
  also 
  has 
  considerable 
  

   resemblance 
  in 
  fotm 
  to 
  G. 
  tortuosKs 
  Jeffreys, 
  but 
  that 
  has 
  a 
  very 
  lus- 
  

   trous 
  surface 
  and 
  more 
  vitreous 
  texture, 
  and 
  moreover 
  entirely 
  lacks 
  

   the 
  posterior 
  angulation. 
  

  

  C. 
  suhoi-atus 
  of 
  Jeffreys, 
  seems 
  to 
  resemble 
  rather 
  closely 
  the 
  small 
  

   specimens 
  of 
  this 
  species, 
  but 
  that 
  has 
  more 
  prominent 
  beaks, 
  is 
  

   wedge-shaped, 
  the 
  antero-dorsal 
  margin 
  sloping 
  pretty 
  rapidly 
  from 
  

   the 
  beak, 
  instead 
  of 
  being 
  nearly 
  straight 
  and 
  horizontal 
  as 
  in 
  our 
  

   species. 
  

  

  CRYPTODON 
  (AXINULUS) 
  FERRUGINOSUS 
  (Forbes). 
  

   (Plate 
  LXXXYII, 
  figs. 
  7, 
  8.) 
  

  

  Cryptodon 
  ferruginosns 
  Yerrill, 
  Trans. 
  Conn. 
  Acad., 
  V, 
  p. 
  570, 
  1882; 
  VI, 
  p. 
  279, 
  

   18S4; 
  Expl. 
  Albatross, 
  Eeport 
  U. 
  S. 
  Com. 
  Fish 
  and 
  Fisheries 
  for 
  1883, 
  p. 
  575, 
  

   1885.— 
  Ball, 
  Bnll. 
  U. 
  S. 
  N:it. 
  Mus., 
  No. 
  37, 
  p. 
  50, 
  1889. 
  

  

  Axitius 
  ferruginosns 
  LOCARD, 
  Campagne 
  du 
  Caiidan, 
  Annates 
  de 
  I'Uuiversite 
  de 
  

   Lyon, 
  p. 
  191, 
  1896. 
  

  

  This 
  very 
  common 
  species 
  was 
  found 
  at 
  numerous 
  stations 
  from 
  N. 
  

   lat. 
  42° 
  47', 
  W. 
  long. 
  61° 
  04', 
  to 
  K 
  lat. 
  35° 
  12' 
  10", 
  W. 
  long. 
  74° 
  57' 
  15", 
  

   in 
  125^ 
  to 
  1,525 
  fathoms, 
  1880-1886. 
  

  

  CRYPTODON 
  (AXINULUS) 
  OVATUS, 
  new 
  species. 
  

   (Plates 
  XCI, 
  fig. 
  7; 
  XCIII, 
  fig. 
  1.) 
  

  

  Shell 
  small, 
  ovate, 
  Jiot 
  swollen, 
  with 
  the 
  posterior 
  end 
  produced 
  and 
  

   somewhat 
  pointed, 
  rusty 
  brown 
  in 
  color 
  and 
  heavily 
  incrusted 
  with 
  

   iron 
  oxide. 
  Umbos 
  rather 
  flattened 
  ; 
  beaks 
  small 
  and 
  concealed 
  by 
  the 
  

   coating 
  of 
  ferruginous 
  matter. 
  The 
  anterior 
  end 
  is 
  well 
  rounded 
  with 
  

   a 
  nearly 
  semicircular 
  curve; 
  the 
  ventral 
  margin 
  is 
  broadly 
  convex; 
  

   the 
  posterior 
  margin 
  is 
  tapered 
  and 
  produced 
  at 
  the 
  end, 
  with 
  the 
  

   dorsal 
  margin 
  a 
  little 
  convex 
  and 
  sloping 
  rapidly. 
  The 
  hinge-margin 
  

   is 
  a 
  little 
  thickened 
  and 
  much 
  obscured 
  by 
  the 
  incrustation. 
  In 
  the 
  

   left 
  valve 
  there 
  is 
  a 
  rather 
  prominent, 
  blunt, 
  tooth-like 
  swelling 
  below 
  

   the 
  lunular 
  area; 
  in 
  the 
  right 
  valve 
  there 
  is 
  a 
  corresiionding 
  notch 
  

   and 
  a 
  rather 
  wide 
  ligamental 
  furrow 
  commencing 
  beneath 
  the 
  beak, 
  

   and 
  running 
  back 
  subparallel 
  with 
  the 
  dorsal 
  margin, 
  becoming 
  more 
  

  

  