﻿N0.1139. 
  DEEP-WATER 
  MOLLUSCA—VEBRILL 
  AND 
  BUSH. 
  877 
  

  

  vex, 
  a 
  little 
  produced 
  iu 
  the 
  middle, 
  and 
  witli 
  a 
  slight 
  incurvature 
  

   toward 
  the 
  posterior 
  end, 
  below 
  the 
  rostrum 
  ; 
  the 
  posterior 
  end 
  is 
  nar- 
  

   rowed 
  and 
  produced 
  into 
  a 
  short 
  obtuse 
  rostrum 
  witli 
  a 
  nearly 
  straight 
  

   dorsal 
  margin. 
  The 
  surface 
  is 
  covered 
  with 
  ratlier 
  hue, 
  somewhat 
  

   uneven, 
  concentric 
  lines 
  and 
  undulations. 
  The 
  hinge-margin 
  is 
  but 
  

   little 
  thickened 
  ; 
  the 
  anterior 
  portion 
  is 
  the 
  shorter 
  and 
  the 
  more 
  curved 
  

   and 
  forms 
  a 
  very 
  obtuse 
  angle 
  with 
  the 
  posterior 
  portion 
  which 
  is 
  

   nearly 
  straight. 
  There 
  are 
  about 
  twelve 
  conspicuous, 
  rather 
  elevated, 
  

   sharp 
  teeth 
  in 
  the 
  anterior 
  series 
  besides 
  three 
  or 
  four 
  minute, 
  proxi- 
  

   mal 
  ones; 
  and 
  more 
  than 
  twenty 
  in 
  the 
  posterior 
  series, 
  the 
  number 
  

   being 
  indeterminable 
  owing 
  to 
  an 
  injury 
  to 
  the 
  margin 
  close 
  to 
  the 
  

   beak. 
  The 
  external 
  ligament 
  is 
  large 
  and 
  conspicuous 
  and 
  occui)ies 
  a 
  

   marginal 
  groove 
  extending 
  the 
  entire 
  length 
  of 
  the 
  posterior 
  series 
  of 
  

   teeth. 
  There 
  appears 
  to 
  have 
  been 
  no 
  chondrophore, 
  but 
  whether 
  the 
  

   line 
  of 
  teeth 
  was 
  continuous 
  is 
  uncertain. 
  

  

  Length, 
  14,5 
  mm.; 
  height, 
  9 
  mm. 
  

  

  One 
  valve 
  (Xo. 
  78972), 
  station 
  2718, 
  N. 
  lat. 
  38° 
  24', 
  W. 
  long. 
  71° 
  52', 
  

   in 
  1,5G9 
  fathoms, 
  1886. 
  

  

  NEILO 
  Adams, 
  1858. 
  

  

  Neilo 
  H. 
  and 
  A. 
  Adams, 
  Genera 
  of 
  Recent 
  Mollnsca, 
  II, 
  p. 
  541); 
  III, 
  pi. 
  cxxvi, 
  

   figs. 
  1, 
  la, 
  Ih, 
  1858. 
  — 
  Verrill 
  and 
  Bush, 
  Amer. 
  Journ. 
  Sii., 
  Ill, 
  pp. 
  57, 
  63, 
  

   January, 
  1897. 
  

  

  Tyjye. 
  — 
  Neilo 
  cumingii 
  Adams. 
  

  

  The 
  type 
  species 
  of 
  this 
  genus 
  has 
  an 
  oblong 
  shell, 
  with 
  a 
  straight 
  

   l)Ostero-dorsal 
  margin 
  and 
  a 
  well-defined 
  rostrum, 
  bounded 
  beneath 
  by 
  

   a 
  pronounced 
  furrow 
  and 
  a 
  marginal 
  indentation, 
  while 
  more 
  veutrally, 
  

   the 
  margin 
  jirotrudes 
  somewhat, 
  the 
  pouting 
  of 
  the 
  margin 
  correspond- 
  

   ing 
  with 
  special 
  lobes 
  of 
  the 
  margin 
  of 
  the 
  mantle. 
  N. 
  cumingii 
  from 
  

   New 
  Zealand 
  is 
  concentrically 
  grooved, 
  but 
  N. 
  goniura 
  (Dall)^ 
  from 
  oft' 
  

   the 
  coast 
  of 
  Ecuador 
  is 
  smooth 
  or 
  nearly 
  so. 
  

  

  NEILONELLA 
  Dall, 
  1881. 
  

  

  Satiir7iia 
  Seguexza, 
  Nucnlidi 
  terziarie 
  nierid. 
  d'ltal., 
  R. 
  Accad. 
  Lincei, 
  I, 
  p. 
  1178, 
  

  

  1877 
  (not 
  Schrank, 
  180:2). 
  

   Leda 
  (section 
  XeiloneUa) 
  Dall, 
  Bull. 
  Mus. 
  Comp. 
  Zoiil., 
  IX, 
  p. 
  125, 
  1881; 
  XII, 
  p. 
  

  

  254, 
  1886.+Saturnia 
  Dall, 
  p. 
  263. 
  

   Neilonella 
  Verrill 
  and 
  Bush, 
  Amer. 
  .Journ. 
  Sci., 
  Ill, 
  pp. 
  57, 
  63, 
  January, 
  1897. 
  

  

  Type. 
  — 
  Neilonella 
  corpulenta 
  Dall. 
  

  

  Shell 
  small, 
  swollen, 
  short-ovate, 
  with 
  both 
  ends 
  obtuse; 
  the 
  poste- 
  

   rior 
  somewhat 
  the 
  longer, 
  blunt 
  at 
  tip, 
  without 
  any 
  distinct 
  rostrum 
  

   Or 
  carina. 
  Exterior 
  usually 
  concentrically 
  grooved. 
  Ligamental 
  area 
  

   not 
  defined. 
  Beaks 
  usually 
  prominent 
  and 
  turned 
  inward 
  and 
  slightly 
  

   backward. 
  Ligament 
  well 
  developed, 
  extending 
  under 
  and 
  before 
  the 
  

   beaks 
  in 
  a 
  distinct 
  groove, 
  more 
  prominent 
  behind. 
  Eesilium 
  very 
  

  

  iDall,,Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  XII, 
  p. 
  251, 
  pi. 
  x, 
  fig. 
  10, 
  1889. 
  

  

  