﻿798 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  voi..xx. 
  

  

  Family 
  ASTARTID^. 
  

  

  ASTARTE 
  NANA 
  (Jeffreys?) 
  Dall. 
  

  

  Astarte 
  nana 
  Daix, 
  Bnll. 
  Mus. 
  Comp. 
  Zool., 
  XII, 
  p. 
  261, 
  pi. 
  vir, 
  figs. 
  6a, 
  6&, 
  1886; 
  

   Bull. 
  IT. 
  S. 
  Nat. 
  Mus., 
  No. 
  .37, 
  p. 
  46, 
  pi. 
  xi\, 
  figs, 
  6a, 
  66, 
  1889. 
  

  

  A 
  single 
  valve, 
  which 
  agrees 
  perfectly 
  with 
  Ball's 
  figures, 
  quoted 
  

   above, 
  was 
  found 
  at 
  station 
  2307, 
  oif 
  Cape 
  Tlatteras, 
  North 
  Carolina, 
  

   in 
  43 
  fathoms, 
  1884. 
  South 
  to 
  Sombrero, 
  in 
  22 
  to 
  196 
  fathoms. 
  — 
  Dall. 
  

  

  Family 
  CUSPID 
  ARID^. 
  

  

  In 
  the 
  classification 
  of 
  this 
  family 
  we 
  have 
  adopted 
  the 
  groups 
  pro- 
  

   posed 
  by 
  Messrs. 
  W. 
  H. 
  Dall 
  and 
  E. 
  A. 
  Smith 
  as 
  defined 
  by 
  Mr. 
  Dall.' 
  

  

  We, 
  however, 
  consider 
  his 
  two 
  subgeueric 
  groups, 
  Cardiomya 
  and 
  

   Halonympha, 
  as 
  distinct 
  genera. 
  

  

  CUSPIDARIA 
  UNDATA 
  VerriU. 
  

  

  (Plates 
  LXXII, 
  fig. 
  1; 
  LXXVIII, 
  figs. 
  3, 
  4.) 
  

  

  Newra 
  undata 
  Verrill, 
  Traus. 
  Conn. 
  Acad., 
  VI, 
  pp. 
  223, 
  277, 
  1884; 
  Expl. 
  Alha- 
  

   trons, 
  Eeport 
  U. 
  S. 
  Com. 
  Fisli 
  and 
  Fisheries 
  for 
  1883, 
  p. 
  574, 
  1885. 
  

  

  Not 
  Myonera 
  undata 
  Dall, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  XII, 
  pp. 
  302, 
  304, 
  1886; 
  Bull. 
  

   U. 
  S. 
  Nat. 
  Mus., 
  No. 
  37, 
  p. 
  68, 
  1889 
  (in 
  part). 
  

  

  Three 
  live 
  specimens 
  and 
  two 
  valves 
  were 
  found 
  at 
  stations 
  2098 
  and 
  

   2566, 
  off 
  Chesapeake 
  Bay, 
  in 
  2,221 
  and 
  2,680 
  fathoms, 
  1883 
  and 
  1885. 
  

  

  Fragments 
  obtained 
  by 
  the 
  Blake 
  near 
  Havana, 
  Dominica, 
  and 
  St. 
  

   Vincent, 
  in 
  450 
  to 
  611 
  fathoms, 
  are 
  erroneously 
  referred 
  by 
  Mr. 
  Dall 
  to 
  

   this 
  species. 
  Our 
  shell 
  is 
  certainly 
  not 
  a 
  Myonera. 
  

  

  We 
  have 
  a 
  fragment 
  of 
  a 
  left 
  valve 
  from 
  station 
  2655, 
  N. 
  lat. 
  27° 
  22', 
  

   W. 
  long. 
  78° 
  7' 
  30", 
  in 
  338 
  fathoms, 
  found 
  among 
  Foraminifera, 
  which 
  

   belongs 
  to 
  a 
  strongly 
  undulated 
  species, 
  with 
  a 
  short, 
  angular, 
  sub- 
  

   acute 
  rostrum 
  defined 
  below 
  by 
  a 
  rather 
  deep 
  groove 
  at 
  which 
  the 
  

   concentric 
  sculpture 
  changes 
  abruptly. 
  The 
  beak 
  is 
  prominent 
  and 
  

   turns 
  strongly 
  backward. 
  The 
  cartilage-plate 
  is 
  strong, 
  deeply 
  con- 
  

   cave, 
  and 
  directed 
  backward; 
  a 
  moderately 
  elevated 
  internal 
  rib 
  runs 
  

   backward 
  from 
  the 
  umbonal 
  region 
  to 
  the 
  posterior 
  muscular 
  scar. 
  

   The 
  shell 
  is 
  thin 
  and 
  has 
  deep 
  internal 
  grooves 
  corresponding 
  to 
  the 
  

   external 
  ridges. 
  Judging 
  by 
  the 
  lines 
  of 
  growth, 
  the 
  shell 
  was 
  short- 
  

   ovate, 
  broadly 
  rounded 
  anteriorly, 
  and 
  having 
  posteriorly 
  a 
  short, 
  

   angular, 
  subacute 
  rostrum; 
  the 
  escutcheon 
  is 
  concave 
  and 
  well-defined 
  

   by 
  a 
  small, 
  sharp 
  ridge. 
  This 
  fragment 
  seems 
  to 
  belong 
  to 
  an 
  unde- 
  

   scribed 
  species 
  of 
  Myonera. 
  It 
  can, 
  however, 
  hardly 
  be 
  the 
  same 
  as 
  

   Mr. 
  Dall's 
  si^ecies, 
  as 
  he 
  states 
  that 
  in 
  his 
  "there 
  is 
  no 
  buttress 
  or 
  

   api)earance 
  of 
  an 
  internal 
  rib." 
  

  

  iBull. 
  Mus. 
  Comp. 
  Zo51., 
  XII, 
  p. 
  292, 
  1886; 
  XVIII, 
  p. 
  441, 
  1889. 
  

  

  