﻿Mollusca 
  from 
  Peru 
  and 
  Argentina. 
  527 
  

  

  sculptured 
  with 
  spiral 
  punctate 
  lines, 
  the 
  remaining 
  whorls 
  

   with 
  very 
  tine 
  and 
  oblique, 
  confused, 
  scratch-like 
  strise 
  ; 
  

   suture 
  very 
  lightly 
  impressed, 
  very 
  narrowly 
  margined 
  

   below, 
  the 
  margin 
  being 
  o£ 
  a 
  whitish 
  colour 
  ; 
  columella 
  

   margin 
  very 
  obliquely 
  descending, 
  curved 
  below, 
  spreading 
  

   outwards 
  into 
  a 
  callous 
  tiiickening 
  and 
  ditTused 
  upwards 
  into 
  

   an 
  ill-defined, 
  granular, 
  parietal 
  callus; 
  labruni 
  narrowly 
  

   outwardly 
  expanded 
  and 
  reflexed, 
  pale 
  flesh-coloured, 
  notched 
  

   at 
  its 
  junction 
  with 
  the 
  columella; 
  aperture 
  obliquely 
  and 
  

   very 
  broadly 
  seniilunate; 
  operculum 
  concave, 
  transparent, 
  

   calcareous, 
  pale 
  flesh-coloured, 
  laminiferous, 
  granular, 
  with 
  

   subcent.ral 
  nucleus. 
  

  

  Alt. 
  625, 
  diam. 
  maj. 
  7*5, 
  diam. 
  min. 
  6 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  3*75, 
  diam. 
  3*25 
  mm. 
  

  

  Hah. 
  Rio 
  Pucaya, 
  Eastern 
  Peru, 
  at 
  an 
  altitude 
  of 
  250 
  feet. 
  

  

  Heh'cina 
  serina, 
  sp. 
  n. 
  

  

  Shell 
  conically 
  turbinate, 
  bright 
  yellow, 
  painted 
  with 
  a 
  

   narrow 
  cream-coloured 
  peripheral 
  band, 
  and 
  shading 
  to 
  the 
  

   same 
  colour 
  in 
  places 
  on 
  the 
  base 
  ; 
  whorls 
  5, 
  regularly 
  in- 
  

   creasing, 
  the 
  last 
  angled 
  at 
  the 
  periphery, 
  the 
  embryonic 
  

   whorls 
  minutely 
  pitted, 
  the 
  remainder 
  marked 
  with 
  transverse 
  

   growth-lines, 
  crossed 
  in 
  all 
  directions 
  by 
  oblique 
  scratch-like 
  

   strise 
  ; 
  suture 
  impressed, 
  very 
  narrowly 
  margined 
  with 
  white 
  

   below 
  ; 
  base 
  of 
  shell 
  moderately 
  convex, 
  showing 
  the 
  scratch- 
  

   like 
  strise 
  of 
  the 
  spire, 
  densely 
  radiately 
  striate 
  ; 
  columella 
  

   margin 
  descending 
  in 
  a 
  short 
  and 
  very 
  gentle 
  curve, 
  out- 
  

   wardly 
  callously 
  thickened, 
  and 
  diffused 
  upwards 
  into 
  an 
  ill- 
  

   defined, 
  coarsely 
  granular, 
  parietal 
  callus; 
  labrum 
  narrowly 
  

   outwardly 
  expanded 
  and 
  reflexed, 
  of 
  a 
  granular 
  texture, 
  

   bearing 
  a 
  slight 
  notch 
  at 
  the 
  base 
  of 
  the 
  columella, 
  in 
  colour 
  

   a 
  bright 
  intense 
  yellow 
  ; 
  aperture 
  rather 
  oblique, 
  broadly 
  and 
  

   depressedly 
  sublunate 
  ; 
  operculum 
  horny, 
  reddish-chestnut 
  

   coloured, 
  granular, 
  a 
  little 
  convex, 
  laminiferous, 
  with 
  lateral 
  

   nucleus. 
  

  

  Alt. 
  9, 
  diam. 
  maj. 
  10, 
  diam. 
  min. 
  8*25 
  mm. 
  

  

  Aperture: 
  alt. 
  4-25, 
  diam. 
  4'75 
  mm. 
  

  

  Hah. 
  Contamano, 
  Rio 
  Ucayali, 
  Eastern 
  Peru. 
  

  

  Amptdlaria 
  contamanoensis, 
  sp. 
  n. 
  

  

  Shell 
  roughly 
  ovate, 
  broadly 
  umbilicate, 
  ashen 
  grey, 
  

   shading 
  to 
  yellowish 
  brown 
  below, 
  and 
  painted 
  with 
  spiral 
  

  

  