﻿880 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.xx. 
  

  

  was 
  formerly 
  tbouglit 
  to 
  be 
  a 
  variety. 
  It 
  differs, 
  however, 
  in 
  its 
  larger 
  

   size, 
  more 
  ovate 
  form, 
  the 
  posterior 
  end 
  being 
  more 
  produced 
  and 
  

   tapered, 
  and 
  in 
  its 
  stronger 
  s(;ulptnre. 
  1^. 
  corjndenta 
  Ball 
  is 
  narrower, 
  

   more 
  elongated, 
  with 
  more 
  prominent 
  beaks. 
  N. 
  quadrangnlaris 
  (Dall) 
  

   is 
  shorter 
  and 
  more 
  triangular 
  in 
  form, 
  with 
  the 
  postero-dorsal 
  margin 
  

   more 
  oblique. 
  

  

  SubfaiTiily 
  'PINID^^RHSTJE 
  A^errill 
  and 
  Bush. 
  

  

  CucuUellina; 
  Fischkr, 
  Manuel 
  Conch., 
  p. 
  981, 
  1887 
  (in 
  part). 
  

  

  Tindarina; 
  Verrill 
  and 
  Bush, 
  Amer. 
  Journ. 
  Sci., 
  Ill, 
  pp. 
  58, 
  63, 
  January, 
  1887. 
  

  

  The 
  genus 
  Tindaria 
  differs 
  so 
  widely 
  from 
  Malletia 
  and 
  other 
  genera 
  

   that 
  it 
  seemed 
  necessary 
  to 
  establish 
  a 
  new 
  subfamily 
  for 
  it. 
  

  

  In 
  this 
  group 
  the 
  shell 
  is 
  rather 
  thick, 
  short-ovate 
  or 
  veneriforni, 
  with 
  

   the 
  posterior 
  end 
  the 
  longer, 
  and 
  with 
  the 
  beaks 
  turned 
  forward. 
  The 
  

   resilium 
  is 
  wanting. 
  The 
  ligament 
  is 
  well 
  developed 
  and 
  prominent. 
  

   The 
  teeth 
  are 
  numerous, 
  V-shaped, 
  in 
  two 
  series 
  which 
  are 
  frequently 
  

   continuous 
  proximally. 
  There 
  is 
  neither 
  pallial 
  sinus 
  nor 
  true 
  siphons. 
  

   The 
  mantle 
  is 
  broadly 
  open 
  ventrally, 
  but 
  there 
  is 
  a 
  separate 
  anal 
  or 
  

   efferent 
  orifice 
  surrounded 
  by 
  small 
  sense 
  papilla'. 
  The 
  palpi 
  are 
  

   large, 
  with 
  long, 
  slender 
  appendages. 
  The 
  foot 
  has 
  a 
  large, 
  terminal, 
  

   crenulated 
  disk. 
  

  

  This 
  group 
  agrees 
  with 
  Malletina^ 
  in 
  having 
  no 
  resilium, 
  but 
  the 
  

   latter 
  has 
  well 
  developed 
  siphons 
  and 
  a 
  i)allial 
  sinus. 
  

  

  TINDARIA 
  Bellardi, 
  1875. 
  

   Tindaria 
  Verijill 
  and 
  Bush, 
  Amer. 
  Journ. 
  Sci., 
  Ill, 
  pp. 
  58, 
  63, 
  January, 
  1897. 
  

  

  Type. 
  — 
  Tindaria 
  arata 
  Bellardi. 
  

  

  Several 
  recent 
  writers 
  on 
  these 
  shells 
  have 
  regarded 
  Tindaria, 
  as 
  a 
  

   subgenus 
  of 
  Malletia. 
  In 
  reality 
  they 
  form 
  two 
  widely 
  diverse 
  genera 
  

   and 
  have 
  little 
  resemblance 
  except 
  that 
  in 
  both 
  the 
  resilium 
  is 
  want- 
  

   ing. 
  In 
  typical 
  Tindaria 
  the 
  shell 
  is 
  swollen, 
  short-ovate 
  or 
  subcor- 
  

   date, 
  without 
  any 
  rostration, 
  with 
  prominent 
  umbos 
  and 
  with 
  the 
  

   beaks 
  turned 
  forward. 
  In 
  fact 
  the 
  shell 
  may 
  be 
  described 
  as 
  veneri- 
  

   form. 
  The 
  surface 
  is 
  usually 
  concentrically 
  grooved. 
  The 
  series 
  of 
  

   teeth 
  are 
  often 
  continuous 
  medially. 
  There 
  is 
  no 
  pallial 
  sinus. 
  

  

  A 
  specimen 
  of 
  T. 
  amahilis 
  DalP 
  from 
  station 
  2385, 
  among 
  Forami- 
  

   nifera, 
  in 
  730 
  fathoms, 
  not 
  very 
  well 
  preserved 
  in 
  alcohol, 
  has 
  the 
  

   mantle 
  closed 
  for 
  a 
  short 
  distance 
  behind 
  the 
  anal 
  orifice 
  which 
  is 
  large 
  

   and 
  surrounded 
  by 
  twelve 
  or 
  more, 
  rather 
  large, 
  unequal 
  papilhr, 
  but 
  

   does 
  not 
  apjjear 
  to 
  be 
  capable 
  of 
  being 
  protruded 
  in 
  a 
  tubular 
  form, 
  

   unless 
  a 
  very 
  short 
  one. 
  The 
  mantle 
  is 
  otherwise 
  freely 
  open 
  along 
  

   the 
  whole 
  ventral 
  margin 
  to 
  the 
  oral 
  area, 
  with 
  its 
  edges 
  nearly 
  plain. 
  

  

  ^Malletia 
  (Tindaria) 
  rytherea 
  Dall, 
  Bull. 
  Mus. 
  Comp. 
  ZooL, 
  XII, 
  p. 
  254, 
  1886; 
  

   XVIIl, 
  p. 
  438, 
  1889; 
  := 
  Malletia 
  amabilis 
  Dall, 
  p. 
  438; 
  ^ 
  Tindaria 
  amabiUs 
  Dall, 
  pi. 
  XL, 
  

   fig.8. 
  

  

  