﻿844 
  ritocEEDiNos 
  of 
  the 
  national 
  museum. 
  

  

  This 
  species 
  is 
  allied 
  to 
  />. 
  (ilomernla 
  Dall. 
  The 
  latter 
  differs 
  in 
  hav 
  

   ing 
  a 
  less 
  roundt'd 
  form 
  with 
  a 
  longer 
  hinge-margin, 
  more 
  definite 
  

   terminal 
  anj^les, 
  and 
  mn<'h 
  more 
  numerous 
  and 
  smaller 
  teeth 
  which 
  are 
  

   nearly 
  continuous. 
  In 
  our 
  si^ecimens 
  of 
  />'. 
  glomerula 
  of 
  corresponding 
  

   size, 
  there 
  are 
  about 
  ten 
  teeth 
  in 
  each 
  series 
  and 
  they 
  are 
  about 
  one-half 
  

   as 
  large. 
  According 
  to 
  Mr. 
  Ball's 
  figures, 
  the 
  umbos 
  of 
  his 
  species 
  are 
  

   larger 
  than 
  in 
  the 
  more 
  northern 
  form, 
  but 
  our 
  specimens 
  of 
  his 
  species 
  

   have 
  the 
  umbos 
  smaller 
  than 
  is 
  indicated 
  by 
  his 
  figures. 
  The 
  position 
  

   of 
  the 
  beaks 
  and 
  form 
  of 
  the 
  ligamental 
  area 
  is 
  nearly 
  the 
  same 
  in 
  both 
  

   species; 
  but 
  the 
  latter 
  appears 
  to 
  be 
  a 
  little 
  wider 
  in 
  ours 
  and 
  the 
  

   beaks 
  are 
  a 
  trifle 
  more 
  oblique. 
  The 
  external 
  sculpture 
  is 
  similar 
  but 
  

   the 
  radial 
  lines 
  are 
  decidedly 
  stronger 
  and 
  less 
  numerous 
  in 
  glomerula, 
  

   aiul 
  the 
  sculpture 
  is 
  quite 
  different 
  in 
  the 
  two 
  valves, 
  while 
  in 
  ours 
  

   there 
  is 
  no 
  percei)tible 
  difference. 
  B. 
  inwquisculpfa 
  (Smith) 
  is 
  also 
  a 
  

   closely 
  allied 
  species 
  which 
  Mr. 
  Dall 
  considers 
  identical 
  with 
  B, 
  glome- 
  

   rula. 
  Mr. 
  Smith's 
  figures 
  are 
  quite 
  different 
  from 
  those 
  of 
  Mr. 
  Dall, 
  

   and 
  also 
  from 
  our 
  West 
  Indian 
  specimens 
  of 
  the 
  latter, 
  and 
  still 
  more 
  

   different 
  from 
  B. 
  ahyssorum. 
  

  

  BATHYARCA 
  PROFUNDICOLA 
  (Verrill). 
  

  

  (Plate 
  LXXVril, 
  fig. 
  2.) 
  

  

  Area 
  profundicola 
  Vekrill, 
  Trans. 
  Conn. 
  Acad., 
  VI, 
  p. 
  439, 
  pi. 
  xliv, 
  figs. 
  23, 
  

   23a, 
  1^185.— 
  Dall, 
  Bull. 
  Mns. 
  Comp. 
  ZocU., 
  XII, 
  \). 
  245, 
  1886. 
  

  

  Macrodon 
  profundicola 
  Dall, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  37, 
  p. 
  42, 
  pi. 
  xlvi, 
  figs. 
  23, 
  

   23a, 
  1889. 
  

  

  A 
  very 
  few 
  specimens, 
  at 
  three 
  stations, 
  between 
  K. 
  lat. 
  40° 
  29', 
  W. 
  

   long. 
  GGo 
  4', 
  and 
  N. 
  lat. 
  'M^, 
  W. 
  long. 
  71° 
  54', 
  in 
  1,769 
  to 
  2,620 
  fathoms, 
  

   1S84 
  and 
  1885. 
  Also 
  among 
  Foramiuifera, 
  station 
  2385, 
  N. 
  lat. 
  28° 
  51', 
  

   W. 
  long. 
  88° 
  18', 
  in 
  730 
  fathoms. 
  

  

  BATHYARCA 
  ANOMALA, 
  new 
  species. 
  

   (Plate 
  LXXVII, 
  fig. 
  8.) 
  

  

  Shell 
  small, 
  oblong, 
  inequilateral, 
  much 
  swollen 
  with 
  large 
  j^rominent 
  

   umbos, 
  and 
  pointed 
  beaks, 
  curved 
  strongly 
  forward 
  and 
  considerably 
  

   separated, 
  owing 
  to 
  the 
  unusually 
  wide, 
  lanceolate, 
  ligamental 
  area, 
  

   which 
  is 
  covered 
  behind 
  the 
  beaks 
  with 
  the 
  remains 
  of 
  a 
  dark 
  thick- 
  

   ened 
  ligament. 
  Dorsal 
  margin 
  straight 
  for 
  nearly 
  its 
  entire 
  length; 
  

   anterior 
  and 
  posterior 
  ends 
  broadly 
  and 
  about 
  equally 
  rounded, 
  the 
  

   posterior 
  a 
  little 
  the 
  more 
  swollen 
  below 
  and 
  longer; 
  ventral 
  margin 
  

   broadly 
  rounded, 
  a 
  little 
  prominent 
  in 
  the 
  middle, 
  with 
  a 
  slight 
  byssal 
  

   indentation 
  in 
  front. 
  Surface 
  everywhere 
  covered 
  with 
  fine, 
  regular, 
  

   raised, 
  radiating 
  lines 
  which 
  are 
  decussated 
  by 
  finer 
  lines 
  of 
  growth; 
  

   the 
  rather 
  thin 
  brown 
  epidermis 
  is 
  scaly 
  or 
  chaffy 
  on 
  the 
  radii, 
  espe- 
  

   cially 
  toward 
  the 
  margins, 
  where 
  it 
  forms 
  minute 
  points. 
  Ilinge-margin 
  

   considerably 
  thickened, 
  increasing 
  in 
  strength 
  toward 
  the 
  ends; 
  iu 
  the 
  

  

  