﻿NO. 
  1139. 
  DEEP-WATER 
  MOLLUSC 
  A— 
  VEBBILL 
  AXD 
  BUSH. 
  779 
  

  

  Family 
  LEPTONIB^E 
  or 
  ERYOINID^. 
  

  

  KELLIA 
  SUBORBICULARIS 
  (Montagu). 
  

   (Plate 
  XCIV, 
  fig's. 
  3, 
  4.) 
  

  

  KeUki 
  siihorbicidaris 
  H. 
  aud 
  A. 
  Adams, 
  Geuera 
  Recent 
  Moll., 
  II, 
  p. 
  475; 
  m^ 
  pi. 
  

   cxiv, 
  figs. 
  8 
  a-c, 
  1858. 
  — 
  Jeffreys, 
  British 
  Concbology, 
  II, 
  p. 
  225, 
  pi. 
  v, 
  fig. 
  

   3, 
  1863; 
  V, 
  p. 
  179, 
  pi. 
  xxxii, 
  fig. 
  2, 
  1869.— 
  Gould, 
  Rep. 
  on 
  Invert, 
  of 
  Mass., 
  

   Binney's 
  ed., 
  p. 
  83, 
  fig. 
  394, 
  1870. 
  — 
  Tryon, 
  Amer. 
  Mar. 
  Conch., 
  p. 
  171, 
  pi. 
  32, 
  

   figs. 
  433, 
  435, 
  1873.— 
  G. 
  O. 
  Saks, 
  Mollusca 
  Reg. 
  Arcticte 
  Norvegia-, 
  p. 
  67, 
  pi. 
  

   19, 
  figs. 
  14 
  a-h, 
  1878. 
  — 
  Jeffreys, 
  Proc. 
  Zool. 
  Soc, 
  London, 
  p. 
  700, 
  June, 
  

   1881.— 
  Smith, 
  E. 
  A., 
  Report 
  Voy. 
  Challenger, 
  Zool. 
  Lamellibranchiata, 
  XIII, 
  

   p. 
  201, 
  1885.— 
  Dall, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  37, 
  p. 
  200, 
  pi. 
  lxviii, 
  fig. 
  5, 
  1889. 
  

  

  One 
  fresh 
  specimen, 
  Massachusetts 
  Bay, 
  off 
  Salem, 
  1877. 
  This 
  

   species 
  appears 
  to 
  be 
  very 
  rare 
  on 
  the 
  American 
  coast. 
  In 
  its 
  hinge- 
  

   characters 
  it 
  seems 
  to 
  agree 
  ck)sely 
  with 
  Bornia 
  Philippi, 
  1836. 
  

  

  MONTACUTA 
  BIDENTATA 
  (Montagu). 
  

   (Plates 
  XCIII, 
  figs. 
  7, 
  S; 
  XCIV, 
  fig. 
  6.) 
  

  

  Mya 
  hidentata 
  Montagi', 
  Test. 
  Brit., 
  p. 
  44, 
  pi. 
  xxvi, 
  fig. 
  5, 
  1803. 
  

  

  Montacnta 
  hkhtitata 
  Forbes 
  and 
  Hanley, 
  Hist. 
  Brit. 
  Moll., 
  II, 
  p. 
  75, 
  pi. 
  xviii, 
  

   figs. 
  6, 
  6a. 
  

  

  TeWimtja 
  bkhiitata 
  H. 
  and 
  A. 
  Adams, 
  Genera 
  Recent 
  Moll.. 
  II, 
  p. 
  478: 
  III, 
  pi. 
  ex 
  v, 
  

   figs.2, 
  2«, 
  1858. 
  

  

  Moiifacuid 
  bidentaia 
  Jeffreys, 
  British 
  Conchology, 
  II, 
  p. 
  208, 
  pi. 
  V, 
  fig. 
  1, 
  1863; 
  

   V, 
  J). 
  177, 
  pi. 
  xxxi, 
  fig. 
  8, 
  1869. 
  — 
  G. 
  O. 
  Sars, 
  Mollusca 
  Reg. 
  Arcticie 
  Norvegiie, 
  

   p. 
  69, 
  pi. 
  19, 
  figs, 
  lla-b, 
  1878.— 
  Jeffreys, 
  Proc. 
  Zoiil. 
  Soc, 
  London, 
  p. 
  698, 
  

   June, 
  1881. 
  — 
  Verrill, 
  Trans. 
  Conn. 
  Acad., 
  V, 
  p. 
  571, 
  1882. 
  — 
  Bush, 
  Trans. 
  

   Conn. 
  Acad., 
  VI, 
  p. 
  479, 
  1885; 
  Expl. 
  Albatross, 
  Report 
  U. 
  S. 
  Com. 
  Fish 
  and 
  

   Fisheries 
  for 
  1883. 
  p. 
  590, 
  1885 
  Not 
  Montacuta 
  bidentaia 
  Gould. 
  

  

  Coni]»aratively 
  few 
  specimens 
  have 
  been 
  found 
  in 
  Long- 
  Island 
  Sound 
  

   and 
  at 
  Thimble 
  Island 
  (A. 
  E. 
  Verrill); 
  Provincetown, 
  Massachusetts 
  

   (S.I.Smith 
  and 
  O. 
  Harger); 
  Vineyard 
  Sound, 
  1875; 
  Cape 
  Cod 
  Bay, 
  

   1879; 
  oft" 
  Block 
  Island, 
  1880; 
  Woods 
  Hole, 
  Massachusetts 
  (Gut 
  of 
  

   Canso, 
  and 
  Naushon 
  Gutters), 
  1882-83. 
  From 
  low- 
  water 
  to 
  15i 
  

   fathoms. 
  Oft' 
  Cape 
  Hatteras, 
  North 
  Carolina, 
  in 
  II 
  to 
  48 
  fathoms. 
  1883 
  

   aud 
  1884. 
  

  

  MONTACUTA 
  BIDENTATA 
  (Montagu), 
  variety 
  TENUIS, 
  new. 
  

   (Plate 
  XCII, 
  fig. 
  7.) 
  

  

  Shell 
  similar 
  to 
  the 
  typical 
  M. 
  hidentata 
  in 
  form 
  aud 
  size, 
  but 
  rela- 
  

   tively 
  more 
  elongated 
  and 
  more 
  nearly 
  elliptical, 
  with 
  the 
  umbos 
  aud 
  

   beaks 
  somewhat 
  less 
  prominent. 
  The 
  surface 
  is 
  covered 
  with 
  fine 
  aud 
  

   pretty 
  regular 
  lines 
  of 
  growth. 
  The 
  teeth 
  in 
  the 
  right 
  valve 
  are 
  strong, 
  

   nearly 
  equal 
  in 
  length 
  and 
  in 
  the 
  amount 
  of 
  divergence 
  from 
  the 
  dorsal 
  

   margin. 
  Tbey 
  diverge 
  more 
  strongly 
  and 
  are 
  thicker 
  and 
  more 
  promi- 
  

   nent, 
  especially 
  at 
  the 
  inner 
  end, 
  than 
  is 
  usual 
  in 
  the 
  true 
  Mdentata. 
  

  

  Length 
  of 
  a 
  medium 
  size 
  si)e(;imen 
  4.7 
  mm.; 
  height, 
  L'.O 
  mm. 
  

  

  