﻿Verrill 
  and 
  Bush 
  — 
  Genera 
  of 
  Zedidce 
  and 
  JVhicididce. 
  57 
  

  

  blunt 
  posteriorly, 
  without 
  any 
  definite 
  rostrum 
  or 
  carination. 
  

   The 
  carinated 
  and 
  rostrated 
  species 
  that 
  have 
  been 
  placed 
  in 
  it 
  

   will 
  thus 
  be 
  referred 
  to 
  JYeilo 
  H. 
  and 
  A. 
  Adams. 
  The 
  siphon 
  

   tubes 
  are 
  long 
  and 
  united 
  nearly 
  to 
  the 
  tips. 
  

  

  The 
  following 
  are 
  some 
  of 
  the 
  known 
  species 
  : 
  

  

  3f. 
  Chilensis 
  Desmoulins 
  (Type), 
  31. 
  obtusa 
  (Sars) 
  Morch, 
  31. 
  

   pallida 
  Smith, 
  31. 
  arrouana 
  Smith, 
  31. 
  Dunkeri 
  Smith, 
  and 
  31. 
  

   Bellardii 
  Seguenza 
  

  

  The 
  subgenus 
  Pseudomalletia, 
  proposed 
  by 
  Fischer 
  for 
  31. 
  

   obtusa, 
  was 
  based 
  on 
  an 
  erroneous 
  description 
  of 
  the 
  siphon 
  tubes. 
  

  

  Neilo 
  Adams. 
  Type 
  N. 
  Cumingii 
  Adams. 
  

  

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

   straight 
  postero-dorsal 
  margin 
  and 
  a 
  well 
  defined 
  rostrum, 
  

   bounded 
  beneath 
  by 
  a 
  pronounced 
  furrow 
  and 
  a 
  marginal 
  inden- 
  

   tation, 
  while 
  more 
  ventrally 
  the 
  margin 
  protrudes 
  somewhat, 
  the 
  

   pouting 
  of 
  the 
  margin 
  corresponding 
  with 
  special 
  lobes 
  of 
  the 
  

   margin 
  of 
  the 
  mantle. 
  The 
  type-species 
  is 
  concentrically 
  grooved, 
  

   but 
  JSf. 
  goniura 
  Dall 
  is 
  smooth 
  or 
  nearly 
  so. 
  

  

  Neilonella 
  Dall. 
  Figures 
  7, 
  8, 
  22. 
  Type 
  N. 
  corpidenta 
  Dall. 
  

  

  Saturnia 
  Seguenza, 
  Xuculidi 
  terziarie 
  merid. 
  d'ltal., 
  R. 
  Accad. 
  

  

  Lincei, 
  i, 
  p. 
  1178, 
  1877 
  (non 
  Schrank, 
  1802). 
  

   Leda 
  (section 
  Neilonella) 
  Dall, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  ix, 
  

  

  p. 
  125, 
  1881 
  ; 
  xii, 
  p. 
  254, 
  188(3 
  + 
  Saturnia, 
  op. 
  cit., 
  p. 
  253. 
  

  

  Shell 
  ovate, 
  with 
  both 
  ends 
  obtuse 
  ; 
  the 
  posterior 
  end 
  somewhat 
  

   longer 
  than 
  the 
  anterior, 
  without 
  any 
  distinct 
  rostrum 
  or 
  carina. 
  

   Exterior 
  usually 
  concentrically 
  grooved. 
  Ligamental 
  area 
  not 
  

   defined. 
  Beaks 
  usually 
  prominent 
  and 
  turned 
  inward 
  and 
  slightly 
  

   backward. 
  External 
  ligament 
  well-developed 
  ; 
  it 
  extends 
  under 
  

   and 
  before 
  the 
  beaks 
  in 
  a 
  distinct 
  groove, 
  more 
  prominent 
  behind. 
  

   Internal 
  cartilage 
  very 
  minute 
  or 
  nearly 
  abortive, 
  occupying 
  a 
  

   slight 
  notch 
  in 
  the 
  medial 
  dorsal 
  margin, 
  external 
  to 
  the 
  series 
  of 
  

   teeth, 
  which 
  proximally 
  become 
  minute 
  and 
  are 
  interrupted 
  only 
  

   by 
  a 
  small, 
  thin 
  edentulous 
  space. 
  Pallial 
  sinus 
  small. 
  Siphon 
  

   tubes 
  short. 
  Labial 
  palpi 
  large, 
  broad, 
  crescent-shape, 
  with 
  long 
  

   tentacular 
  appendages. 
  Gills 
  small, 
  triquetral. 
  

  

  The 
  following 
  species 
  appear 
  to 
  belong 
  here 
  : 
  

  

  JV. 
  corpidenta 
  Dall 
  (type), 
  Jsf. 
  quadrangular 
  is 
  (Dall), 
  A 
  7 
  *. 
  

   sericea 
  (Jeffreys), 
  JSf. 
  2iusio 
  (Phil.), 
  and 
  A 
  7 
  ", 
  subovata 
  V. 
  and 
  B.* 
  

  

  * 
  Neilonella 
  subovata, 
  sp. 
  nov. 
  Figures 
  7, 
  8, 
  22. 
  

   Yoldia 
  sericea 
  Jeff. 
  var. 
  striolata 
  Yerrill, 
  Trans. 
  Conn. 
  Acad., 
  vi, 
  p. 
  226, 
  1884. 
  

  

  Shell 
  somewhat 
  swollen, 
  subovate. 
  sculptured 
  with 
  regular 
  concentric 
  sulcations 
  

   and 
  ridges, 
  usually 
  faint 
  or 
  obsolete 
  posteriorly, 
  and 
  with 
  a 
  number 
  of 
  faint 
  radiat- 
  

   ing 
  stria? 
  posteriorly. 
  Beaks 
  curved 
  strongly 
  iQ 
  ward 
  and 
  a 
  little 
  backward. 
  Hinge 
  

   margin 
  rather 
  strong, 
  the 
  series 
  of 
  teeth 
  interrupted 
  by 
  a 
  small 
  edentulous 
  space 
  ; 
  

   eleven 
  or 
  twelve 
  anterior 
  and 
  fifteen 
  or 
  sixteen 
  posterior 
  teeth. 
  External 
  liga- 
  

   ment 
  well-developed, 
  dark 
  brown, 
  conspicuous 
  behind 
  the 
  beaks, 
  and 
  extending 
  a 
  

  

  