﻿MOLLtrsCA. 
  41 
  

  

  ridge, 
  and 
  between 
  this 
  and 
  the 
  first 
  lira 
  and 
  in 
  the 
  interstices 
  

   between 
  the 
  other 
  lir;x) 
  the 
  surface 
  is 
  finely 
  striated. 
  The 
  last 
  

   whorl 
  is 
  elongate, 
  has 
  about 
  thirty-one 
  ridges 
  in 
  addition 
  to 
  the 
  

   minute 
  infcerstriation. 
  The 
  aperture 
  is 
  narrow, 
  contracted 
  ante- 
  

   riorly 
  into 
  a 
  short, 
  broadish 
  canal, 
  together 
  equalling 
  almost 
  half 
  

   the 
  total 
  length 
  of 
  the 
  shell. 
  The 
  columella 
  is 
  perpendicular, 
  

   curving 
  a 
  little 
  to 
  the 
  left 
  in 
  front, 
  and 
  coated 
  with 
  a 
  very 
  tliin 
  

   callosity. 
  The 
  labrum 
  is 
  thickened 
  exteriorly, 
  arcuate 
  in 
  the 
  middle, 
  

   faintly 
  sinuatcd 
  towards 
  the 
  lower 
  extremity, 
  and 
  rather 
  deeply 
  

   notched 
  in 
  the 
  slight 
  constriction 
  of 
  the 
  whorl 
  near 
  but 
  not 
  at 
  the 
  

   suture. 
  

  

  Length 
  15 
  millim., 
  diam, 
  of 
  last 
  whorl 
  above 
  the 
  mouth 
  4g 
  ; 
  

   aperture 
  7 
  long, 
  2 
  wide. 
  

  

  Hah. 
  Arafura 
  Sea, 
  N". 
  Australia, 
  32-36 
  fms. 
  

  

  This 
  species 
  is 
  peculiar 
  on 
  account 
  of 
  the 
  absence 
  of 
  longitudinal 
  

   costa?. 
  The 
  outer 
  lip 
  is 
  smooth 
  in 
  the 
  single 
  specimen 
  at 
  hand, 
  but 
  

   in 
  other 
  and 
  more 
  mature 
  shells 
  it 
  might 
  be 
  more 
  or 
  less 
  dentate 
  

   within. 
  

  

  10, 
  Cythara 
  cylindrica, 
  var, 
  (Plate 
  IV. 
  figs. 
  H-H 
  1.) 
  

  

  Mangelia 
  cylindrica, 
  JReeve, 
  Conch. 
  Icon. 
  sp. 
  9. 
  

   Var.=M. 
  lyrica, 
  Reeve, 
  I. 
  c. 
  sp. 
  30. 
  

  

  Hah. 
  Port 
  Curtis, 
  7 
  fms, 
  {Coppinger) 
  ; 
  Philippine 
  Islands 
  

   {C^^m^ng\ 
  

  

  This 
  species 
  differs 
  from 
  the 
  typical 
  Ci/tharce 
  in 
  having 
  no 
  trans- 
  

   verse 
  lirpe 
  on 
  the 
  columella, 
  in 
  this 
  respect 
  agreeing 
  with 
  C. 
  horn- 
  

   heckii, 
  Reeve, 
  C. 
  turricula, 
  E,eeve, 
  and 
  G. 
  vitiensis, 
  Smith. 
  

  

  The 
  variety 
  (C. 
  lyrica) 
  is 
  a 
  trifle 
  larger 
  than 
  the 
  normal 
  form, 
  

   and 
  the 
  riblets 
  are 
  rather 
  stronger 
  at 
  the 
  upper 
  termination. 
  With 
  

   these 
  feeble 
  distinctions 
  the 
  differences 
  end. 
  In 
  both 
  forms 
  a 
  

   minute 
  tubercle 
  is 
  sometimes, 
  but 
  not 
  always, 
  met 
  with 
  upon 
  the 
  

   upper 
  part 
  of 
  the 
  columella, 
  and 
  about 
  fifteen 
  fine 
  lira3 
  may 
  be 
  

   counted 
  within 
  the 
  exteriorly 
  thickened 
  labrum, 
  which 
  is 
  shaUowly 
  

   sinuated 
  near 
  the 
  suture, 
  and 
  prominently 
  arcuated 
  when 
  viewed 
  

   laterally. 
  The 
  longitudinal 
  costse 
  number 
  about 
  fourteen 
  on 
  the 
  

   penultimate 
  whorl, 
  and 
  the 
  principal 
  transverse 
  thread-like 
  liraj 
  

   about 
  eight, 
  but 
  upon 
  the 
  last 
  volution 
  there 
  are 
  as 
  many 
  as 
  twenty- 
  

   six. 
  The 
  entire 
  surface 
  is 
  beautifully 
  cancellated 
  with 
  minute 
  

   raised 
  lines 
  of 
  growth 
  and 
  microscopic 
  spiral 
  lira;, 
  a 
  feature 
  seen 
  

   only 
  in 
  well-preserved 
  shells 
  and 
  under 
  a 
  powerful 
  lens. 
  The 
  

   sculptured 
  whorls 
  are 
  six 
  in 
  number, 
  the 
  remaining 
  two 
  apical 
  ones 
  

   being 
  smooth 
  and 
  glassy. 
  

  

  The 
  single 
  specimen, 
  in 
  beautifnl 
  condition, 
  from 
  Port 
  Curtis, 
  

   presents 
  certain 
  differences 
  which 
  it 
  may 
  be 
  as 
  well 
  to 
  mention. 
  

   At 
  the 
  upper 
  part 
  the 
  whorls 
  exhibit 
  a 
  faint 
  concavity 
  a 
  little 
  

   beneath 
  the 
  suture, 
  of 
  which 
  I 
  perceive 
  a 
  trace 
  in 
  the 
  type 
  of 
  the 
  

   species, 
  but 
  not 
  in 
  the 
  variety 
  (C. 
  lyrica), 
  and 
  the 
  cost?e 
  are 
  rather 
  

   more 
  numerous, 
  there 
  being 
  about 
  17 
  upon 
  the 
  penultimate 
  whorl, 
  

  

  