﻿522 
  Mr. 
  H. 
  B. 
  Preston 
  on 
  

  

  new 
  

  

  rugose, 
  with 
  a 
  thick 
  shining 
  rim 
  ; 
  under 
  the 
  microscope 
  the 
  

   sides 
  of 
  the 
  area 
  show 
  strong 
  ridges, 
  which 
  are 
  vertical, 
  not 
  

   oblique; 
  lateral 
  margins 
  of 
  posterior 
  truncation 
  not 
  sharply 
  

   defined; 
  tegulre 
  fulvous 
  or 
  rufo-fulvous. 
  Wings 
  'clear, 
  

   stigma 
  and 
  nervures 
  ferruginous; 
  outer 
  nervures 
  scarcely 
  

   weakened; 
  second 
  s.m. 
  broad 
  below 
  ; 
  first 
  r. 
  n. 
  meeting 
  

   second 
  t.-c, 
  or 
  entering 
  extreme 
  apical 
  corner 
  of 
  second 
  s.m. 
  

   Legs 
  black, 
  the 
  knees 
  and 
  apices 
  of 
  tibiae 
  more 
  or 
  less 
  pale 
  

   reddish 
  ; 
  tarsi 
  cream-colour, 
  becoming 
  pale 
  ferruginous 
  

   apically. 
  Abdomen 
  broad, 
  shining, 
  first 
  two 
  segments 
  finely, 
  

   not 
  densely 
  punctured 
  ; 
  hind 
  margins 
  of 
  segments 
  very 
  

   faintly, 
  variably, 
  reddish 
  ; 
  bases 
  of 
  second 
  and 
  following 
  

   segments 
  with 
  bands 
  of 
  pale 
  tomentum, 
  not 
  always 
  exposed 
  ; 
  

   apical 
  plate 
  very 
  broad, 
  dark. 
  

  

  Hab. 
  New 
  South 
  Wales, 
  two 
  specimens 
  (Nat. 
  Mus. 
  

   Victoria, 
  102). 
  Closely 
  allied 
  to 
  H. 
  clelandi, 
  Ckll., 
  but 
  

   mesothorax 
  and 
  tarsi 
  difi^'erent. 
  

  

  LX. 
  — 
  Neiv 
  Non-Marine 
  Molluscafrom 
  Peru 
  and 
  Argentina. 
  

   By 
  H. 
  B. 
  Preston, 
  F.Z.S. 
  

  

  Ammonoceras 
  pebasensis, 
  sp. 
  n. 
  

  

  Shell 
  small, 
  depressedly 
  conoid, 
  with 
  somewhat 
  tumid 
  last 
  

   whorl 
  and 
  base, 
  greenish 
  yellow, 
  polisiied, 
  a 
  little 
  shining 
  ; 
  

   whorls 
  5, 
  regularly 
  increasing, 
  the 
  apical 
  whorls 
  smooth, 
  the 
  

   remainder 
  sculptured 
  with 
  fine, 
  closely-set, 
  somewhat 
  wavy, 
  

   spiral 
  stride 
  crossed 
  by 
  transverse 
  growth-plication 
  ; 
  suture 
  

   deeply 
  impressed, 
  indistinctly 
  margined 
  below 
  ; 
  umbilicus 
  

   moderately 
  broad, 
  deep, 
  well-like, 
  occupying 
  about 
  one-fifth 
  

   of 
  the 
  total 
  diameter 
  of 
  the 
  shell 
  ; 
  columella 
  margin 
  descend- 
  

   ing 
  somewhat 
  obliquely, 
  diffused 
  above 
  into 
  a 
  well-defined, 
  

   restricted, 
  parietal 
  callus 
  which 
  reaches 
  to 
  the 
  upper 
  margin 
  

   of 
  the 
  labrum 
  ; 
  labrum 
  acute, 
  aperture 
  ovate. 
  

  

  Alt. 
  3, 
  diam. 
  maj, 
  5, 
  diam. 
  min. 
  4*5 
  mm. 
  

  

  Aperture 
  : 
  alt. 
  2'25, 
  diam. 
  1*75 
  mm. 
  

  

  Mab. 
  Forests 
  about 
  Pebas, 
  Bio 
  Marafion, 
  N.E. 
  Peru. 
  

  

  Ammonoceras 
  pucai/aensis, 
  sp. 
  n. 
  

  

  Shell 
  small, 
  orbicular, 
  very 
  depressed, 
  semitransparent, 
  

   vitreous, 
  tinged 
  with 
  yellowish 
  cream-colour 
  and 
  painted 
  

  

  