﻿sowERrir 
  : 
  desckiption 
  of 
  ampullaria 
  mermodi, 
  n.sp. 
  153 
  

  

  plicatus, 
  fusco-olivaceiis 
  ; 
  apertura 
  amp]a, 
  verticalis, 
  intus 
  violacea, 
  

   versus 
  marginem 
  alba; 
  peristoma 
  tenue, 
  postice 
  leviter 
  incrassata; 
  

   columella 
  albo-callosa, 
  tenuita 
  depressa. 
  Loug. 
  66, 
  lat. 
  53 
  mm. 
  ; 
  

   apertui'a 
  long. 
  48, 
  lat. 
  57 
  mm, 
  

  

  JIab. 
  — 
  Central 
  America 
  (ex 
  coll. 
  Delessert). 
  

  

  This 
  shell 
  bears 
  some 
  resemblance 
  to 
  Amp. 
  nrcetis 
  (Miiller) 
  = 
  

   ruffosa 
  (Lamk.), 
  especially 
  in 
  the 
  character 
  of 
  its 
  outer 
  surface, 
  

   which 
  is 
  longitudinally 
  rather 
  roughly, 
  irregularly, 
  and 
  thinly 
  

   plicate, 
  or 
  fibrous; 
  but 
  it 
  differs 
  from 
  that 
  species 
  in 
  form, 
  and 
  

   particularly 
  in 
  its 
  narrow 
  sutural 
  canal 
  and 
  scarcely 
  visible 
  

   umbilicus. 
  The 
  white 
  columella 
  callus 
  is 
  flattened 
  over 
  the 
  

   umbilical 
  region. 
  The 
  aperture 
  is 
  ample, 
  and 
  the 
  interior 
  suflFused 
  

   with 
  a 
  violet 
  tint. 
  

  

  