﻿GDDE 
  : 
  ON 
  LAND 
  SHELLS 
  PROM 
  NEW 
  GUINEA. 
  81 
  

  

  Hemiplecta 
  (?) 
  FouLLioTi, 
  Le 
  Guill. 
  

  

  A 
  large 
  series 
  of 
  this 
  fine 
  species 
  was 
  collected, 
  including 
  several 
  

   immature 
  specimens, 
  in 
  various 
  stages 
  of 
  growth, 
  which 
  are 
  carinated, 
  

   the 
  keels 
  disappearing 
  when 
  about 
  4J 
  whorls 
  have 
  been 
  completed. 
  

  

  The 
  mature 
  shells 
  are 
  all 
  larger 
  than 
  the 
  type 
  from 
  Triton 
  Bay, 
  

   which 
  is 
  stated 
  to 
  measure 
  : 
  diam. 
  46, 
  alt. 
  29 
  mm., 
  whereas 
  my 
  

   largest 
  specimen 
  has 
  the 
  following 
  dimensions 
  : 
  diam. 
  maj. 
  .57;5, 
  min. 
  

   47"5 
  mm. 
  ; 
  alt. 
  32 
  mm. 
  ; 
  while 
  the 
  smallest 
  measures 
  : 
  diam. 
  maj. 
  48, 
  

   min. 
  41*5 
  mm.; 
  alt. 
  29 
  mm. 
  Some 
  shells 
  have 
  a 
  sharply 
  defined 
  

   infra-peripheral, 
  broad, 
  dark 
  olivaceous 
  zone, 
  occupying 
  quite 
  half 
  of 
  

   the 
  base, 
  the 
  remainder 
  being 
  pale 
  olivaceous. 
  The 
  parietal 
  callus 
  of 
  

   the 
  mouth 
  is 
  minutely 
  granulated, 
  a 
  feature 
  to 
  which 
  no 
  reference 
  

   appears 
  to 
  have 
  been 
  made 
  by 
  any 
  previous 
  observers. 
  The 
  only 
  

   figures 
  published 
  of 
  the 
  species 
  are 
  in 
  the 
  Conch. 
  Cab., 
  Helix, 
  1900, 
  

   Abth.v, 
  p. 
  999, 
  pi. 
  cclix, 
  figs. 
  1-3. 
  

  

  The 
  generic 
  position 
  of 
  this 
  species 
  is 
  uncertain. 
  Described 
  by 
  

   Le 
  Guillou 
  as 
  Helix, 
  and 
  referred 
  by 
  Gray 
  and 
  others 
  to 
  Nanina, 
  

   it 
  was 
  placed 
  in 
  Hemiplecta 
  by 
  Pfeiffer 
  and 
  Tapparone-Canefri, 
  while 
  

   Kobelt 
  doubtfully 
  assigned 
  it 
  to 
  Xesta. 
  Fortunately, 
  Mr. 
  Pratt 
  

   brought 
  a 
  specimen 
  with 
  the 
  whole 
  animal 
  preserved 
  in 
  alcohol, 
  and 
  

   as 
  Mr. 
  Burne 
  has 
  kindly 
  undertaken 
  to 
  investigate 
  its 
  anatomy 
  it 
  is 
  

   anticipated 
  that 
  all 
  doubt 
  in 
  this 
  respect 
  will 
  shortly 
  be 
  cleared 
  up. 
  

  

  Calycia 
  CRrsTALLiNA, 
  Eve. 
  

   Several 
  specimens. 
  

  

  Chloritis 
  pervicina. 
  Smith. 
  

   Ann. 
  Mag. 
  Nat. 
  Hist., 
  ser. 
  vi., 
  vol. 
  xx, 
  p. 
  411, 
  pi. 
  ix, 
  figs. 
  8-10. 
  

  

  One 
  specimen 
  is 
  a 
  trifle 
  smaller 
  than 
  the 
  type. 
  Diam. 
  maj. 
  26-5, 
  

   min. 
  22 
  mm. 
  ; 
  alt. 
  13'5 
  mm. 
  

  

  Albersia 
  tenuis, 
  Pfr, 
  

  

  A 
  large 
  series 
  of 
  specimens 
  in 
  beautiful 
  condition 
  was 
  obtained. 
  

   The 
  species 
  appears 
  to 
  be 
  very 
  stable, 
  varying 
  but 
  little 
  either 
  in 
  form, 
  

   colour, 
  or 
  texture. 
  In 
  size 
  the 
  range 
  is 
  also 
  inconsiderable, 
  the 
  

   largest 
  shell 
  being 
  35 
  mm. 
  in 
  diameter 
  and 
  the 
  smallest 
  31 
  mm., 
  while 
  

   in 
  height 
  they 
  vary 
  from 
  23*5 
  to 
  27 
  mm. 
  

  

  At 
  first 
  it 
  was 
  thought 
  to 
  be 
  an 
  undescribed 
  form, 
  as, 
  on 
  comparison 
  

   with 
  A. 
  tenuis, 
  the 
  periostracum, 
  which 
  under 
  a 
  strong 
  lens 
  appears 
  of 
  

   a 
  beautiful 
  silky 
  texture, 
  showed 
  considerable 
  difference, 
  exhibiting 
  

   undulating, 
  obliquely 
  descending 
  wrinkles, 
  but 
  on 
  closer 
  scrutiny 
  the 
  

   type 
  of 
  A. 
  tenuis, 
  to 
  which 
  Mr. 
  Smith, 
  with 
  his 
  usual 
  courtesy, 
  allowed 
  

   me 
  to 
  have 
  access, 
  and 
  which 
  is 
  in 
  a 
  somewhat 
  worn 
  condition, 
  was 
  

   found 
  to 
  show 
  faint 
  traces 
  of 
  a 
  similar 
  sculpture. 
  

  

  Pfeiffer 
  makes 
  no 
  mention 
  of 
  this 
  feature, 
  which, 
  in 
  view 
  of 
  the 
  

   condition 
  of 
  the 
  shell 
  on 
  which 
  he 
  based 
  his 
  diagnosis, 
  is 
  not 
  surprising. 
  

  

  PaPUINA 
  LENTA, 
  Pfr. 
  

   A 
  single 
  dead 
  and 
  worn 
  specimen 
  is 
  not 
  without 
  some 
  doubt 
  referred 
  

   to 
  this 
  species. 
  In 
  the 
  Cuming 
  Collection 
  occurs 
  a 
  shell 
  — 
  also 
  dead 
  

   and 
  worn 
  — 
  which, 
  except 
  for 
  the 
  slightly 
  more 
  angulated 
  periphery, 
  is 
  

  

  VOL. 
  IX. 
  — 
  MARCH, 
  1910. 
  6 
  

  

  