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  NOTE 
  ON 
  TRIPHOBA 
  SMITHI, 
  SOWERBY, 
  AND 
  T. 
  GRACILIOR, 
  

  

  SMITH, 
  

   liy 
  the 
  late 
  Edgar 
  A. 
  SMtTH, 
  I.S.O., 
  F.Z.S., 
  etc. 
  

   Bead 
  10th 
  March, 
  191G. 
  

   TraPHoUA 
  smith 
  i 
  was 
  described 
  by 
  Mr. 
  G. 
  E. 
  Sowerby 
  in 
  these 
  

   " 
  Troceedinfis 
  " 
  (vol. 
  vi, 
  p. 
  IT/i) 
  from 
  a 
  single 
  shell 
  preserved 
  in 
  the 
  

   collection 
  of 
  the 
  late 
  Admiral 
  Keppel. 
  At 
  the 
  time 
  (September, 
  

   190i) 
  the 
  locality 
  was 
  unkiiowu, 
  and 
  the 
  unique 
  sliell 
  was 
  referred 
  

   to 
  as 
  " 
  larger 
  than 
  any 
  other 
  known 
  species 
  of 
  tlie 
  genus" 
  excepting 
  

   2\ 
  princeps, 
  described 
  by 
  Mr. 
  Sowerby 
  at 
  the 
  same 
  time, 
  also 
  from 
  an 
  

   unknown 
  locality. 
  The 
  object 
  of 
  this 
  note 
  is 
  to 
  point 
  out 
  that 
  

   T. 
  smithi 
  liad 
  previously 
  been 
  described 
  by 
  myself 
  as 
  'f. 
  gracilior, 
  

   that 
  the 
  species 
  when 
  adult 
  is 
  qiiite 
  as 
  large 
  as 
  T. 
  pruiceps, 
  and 
  also 
  

   to 
  give 
  its 
  geographical 
  distribution 
  as 
  far 
  as 
  at 
  present 
  known. 
  

  

  The 
  description 
  of 
  T. 
  gracilior 
  was 
  })ublished 
  on 
  November 
  15tli, 
  

   1903, 
  in 
  Stanley 
  Gardiner's 
  Fauna 
  and 
  Geography 
  of 
  the 
  Maldive 
  and 
  

   Laccadive 
  Archipelagoes 
  (vol. 
  ii, 
  p. 
  614, 
  pi. 
  xxxv, 
  ligs. 
  18, 
  19). 
  The 
  

   species 
  was 
  founded 
  on 
  a 
  single 
  shell 
  from 
  the 
  Maldive 
  Islands, 
  

   which 
  is 
  preserved 
  in 
  the 
  Eritish 
  Museum. 
  It 
  is 
  5 
  mm. 
  shorter 
  than 
  

   Mr. 
  Sowerby's 
  type, 
  also 
  in 
  the 
  national 
  collection, 
  having 
  a 
  length 
  

   of 
  28 
  ram. 
  In 
  the 
  year 
  1907 
  the 
  Museum 
  acquired 
  a 
  large 
  selection 
  

   of 
  sliells 
  from 
  an 
  extensive 
  collection 
  made 
  at 
  the 
  Andaman 
  Islands 
  

   by 
  the 
  late 
  Rev. 
  J. 
  L. 
  T. 
  Warneford, 
  and 
  among 
  the 
  specimens 
  

   obtained 
  was 
  a 
  fine 
  example 
  of 
  T. 
  gracilior, 
  wliich 
  if 
  the 
  top 
  of 
  the 
  

   spire 
  had 
  not 
  been 
  broken 
  off 
  must 
  have 
  measured 
  almost 
  60 
  mm. 
  in 
  

   length. 
  

  

  Mr. 
  Sowerby 
  has 
  given 
  the 
  number 
  of 
  wliorls 
  of 
  T. 
  smithi 
  as 
  thirty- 
  

   five, 
  but 
  in 
  my 
  examination 
  of 
  tlie 
  type 
  I 
  can 
  count 
  only 
  twenty-six. 
  

   Perhaps 
  Mr. 
  Sowerby 
  may 
  liave 
  allowed 
  nine 
  extra 
  whorls 
  for 
  the 
  

   top 
  of 
  the 
  spire 
  which 
  is 
  wanting, 
  but 
  I 
  do 
  not 
  think 
  it 
  would 
  have 
  

   consisted 
  of 
  so 
  many. 
  He 
  described 
  the 
  whorls 
  as 
  having 
  2—4 
  

   spirals, 
  which 
  is 
  vague 
  and 
  not 
  quite 
  accurate, 
  since 
  each 
  whorl 
  

   bears 
  three 
  spirals, 
  the 
  uppermost, 
  below 
  a 
  fine 
  sutural 
  thread, 
  being 
  

   a 
  little 
  more 
  slender 
  than 
  the 
  other 
  two. 
  The 
  latter 
  also 
  are 
  slightly 
  

   affected 
  by 
  faint 
  longitudinal 
  depressions, 
  giving 
  them 
  an 
  obscurely 
  

   beaded 
  appearance. 
  This 
  is 
  noticeable 
  in 
  the 
  types 
  both 
  of 
  smithi 
  

   and 
  gracilior, 
  but 
  is 
  hardly 
  apparent 
  in 
  the 
  very 
  large 
  Andaman 
  

   specimen. 
  The 
  space 
  between 
  the 
  second 
  and 
  third 
  keel 
  is 
  a 
  little 
  

   broader 
  than 
  that 
  whicb 
  separates 
  the 
  first 
  and 
  second, 
  and 
  the 
  

   suture 
  is 
  filo-carinate. 
  The 
  labrum 
  in 
  the 
  adult 
  is 
  a 
  trifle 
  effuse, 
  

   and 
  exhibits 
  within 
  three 
  grooves, 
  which 
  correspond 
  to 
  three 
  of 
  the 
  

   external 
  spirals 
  or 
  carinas, 
  namely, 
  the 
  two 
  ])eri])heral 
  ones 
  close 
  

   together 
  and 
  one 
  above 
  more 
  remote. 
  The 
  columella 
  has 
  a 
  well- 
  

   defined 
  callus 
  extending 
  from 
  the 
  junction 
  of 
  the 
  outer 
  lip 
  above 
  to 
  

   the 
  end 
  of 
  the 
  obli(^ue 
  anterior 
  canal, 
  which 
  is 
  not 
  closed. 
  

  

  In 
  conclusion, 
  I 
  may 
  add 
  that 
  the 
  figure 
  of 
  2\ 
  smithi 
  does 
  not 
  give 
  

   any 
  idea 
  of 
  the 
  true 
  sculpture 
  of 
  the 
  species. 
  Tliat 
  of 
  T. 
  gracilior 
  

   in 
  Mr. 
  Stanley 
  Gardiner's 
  work 
  is 
  fairlj* 
  accurate. 
  

  

  