﻿rOLTON 
  : 
  NEW 
  SPECIKS 
  OF 
  SIAMESE 
  VIVIPAHA. 
  241 
  

  

  oblique 
  microscopic 
  striae, 
  or 
  growth 
  - 
  lines, 
  and 
  a 
  number 
  of 
  

   irregularly 
  disposed 
  hairs; 
  spire 
  flat; 
  whorls 
  4, 
  convex, 
  slowly 
  

   increasing 
  in 
  width, 
  last 
  half-whorl 
  slightly 
  descending; 
  aperture 
  

   somewhat 
  oblique, 
  subcircular; 
  peristome 
  simple, 
  not 
  thickened. 
  

  

  Maj. 
  diara. 
  3"5, 
  alt. 
  2 
  mm. 
  

  

  ITab. 
  — 
  Cartagena, 
  Colombia 
  (Dr. 
  J. 
  S. 
  Gibbons). 
  

  

  Like 
  a 
  miniature 
  Chloritis, 
  and 
  resembling 
  nothing 
  known 
  to 
  me 
  

   from 
  the 
  West 
  Indian 
  region. 
  

  

  DESCRIPTION 
  OF 
  A 
  NEW 
  SPECIES 
  OF 
  SIAMESE 
  VIVIPARA 
  

   {V. 
  OCCULTA). 
  

  

  By 
  Hugh 
  C. 
  Fulton. 
  

   Bead 
  13th 
  April, 
  1917. 
  

   Shell 
  trochiforra, 
  rather 
  thin, 
  very 
  narrowly 
  umbilicated, 
  covered 
  

   with 
  a 
  chocolate-brown 
  periostracura, 
  which 
  when 
  cleaned 
  is 
  slightly 
  

   polished, 
  the 
  under 
  side 
  is 
  a 
  trifle 
  lighter 
  . 
  in 
  colour 
  and 
  is 
  sometimes 
  

   of 
  a 
  greenish-brown 
  tint 
  ; 
  whorls 
  (remaining) 
  4, 
  the 
  younger 
  shell 
  

   having 
  one 
  and 
  a 
  half 
  more, 
  inconspicuously 
  oblique 
  striated, 
  last 
  

   whorl 
  scarcely 
  descending, 
  sharply 
  carinate, 
  partly 
  malleated, 
  

   microscopically 
  spirally 
  striated 
  on 
  under 
  side 
  ; 
  aperture 
  very 
  

   oblique, 
  interior 
  bluish-white 
  with 
  an 
  ill-defined 
  brown 
  spiral 
  band 
  

   at 
  upper 
  part 
  ; 
  peristome 
  slightly 
  expanded 
  at 
  the 
  columellar 
  and 
  

   basal 
  portions, 
  but 
  thin 
  and 
  acute 
  at 
  right 
  margin, 
  margins 
  connected 
  

   by 
  a 
  rather 
  thin 
  bluish-white 
  callus 
  ; 
  umbilicus 
  almost 
  covered 
  ; 
  

   operculum 
  normal. 
  

  

  Alt. 
  (including 
  peristome) 
  19, 
  diam. 
  maj. 
  20 
  mm. 
  

  

  Hab. 
  — 
  Siam 
  (Carl 
  Bock, 
  ex 
  Damon 
  Coll.). 
  

  

  This 
  shell 
  has 
  been 
  distributed 
  as 
  V. 
  frochoides, 
  Marts, 
  {-umhilicata, 
  

   E,ve., 
  11071 
  Lea), 
  but 
  reference 
  to 
  the 
  figures 
  of 
  tliat 
  species 
  is 
  sufficient 
  

   to 
  confirm 
  its 
  distinctness. 
  V. 
  occulta 
  is 
  figured 
  in 
  the 
  Conch. 
  Cab. 
  

   (jSTeue 
  Folge) 
  by 
  Kobelt 
  in 
  his 
  monograph 
  of 
  the 
  genus, 
  on 
  pi. 
  xliv, 
  

   tigs. 
  10-14. 
  My 
  suspicion 
  that 
  Martens 
  had 
  made 
  a 
  mistake 
  in 
  the 
  

   measurements 
  of 
  trochoides 
  is 
  confirmed 
  by 
  Morelet 
  in 
  the 
  Journ. 
  de 
  

   Conch., 
  vol. 
  xvii, 
  p. 
  197. 
  

  

  