﻿OLD 
  AND 
  NEW 
  WORLD 
  MELANLVNS 
  — 
  MORRISON 
  385 
  

  

  ture 
  is 
  nearly 
  semicircular 
  with 
  a 
  broad, 
  flattened, 
  white 
  columella. 
  

   The 
  operculum 
  is 
  similar 
  to 
  that 
  of 
  Melanoides; 
  thin, 
  corneous, 
  and 
  

   paucispiral, 
  of 
  less 
  than 
  two 
  turns. 
  A 
  few 
  small-to-medium, 
  but 
  not 
  

   uniform-sized, 
  young 
  shells 
  found 
  dried 
  inside 
  some 
  adult 
  specimens 
  

   indicated 
  that 
  this 
  genus 
  belongs 
  to 
  the 
  Thiaridae, 
  although 
  the 
  

   animals 
  were 
  not 
  available 
  for 
  study. 
  

  

  Fijidomarnaculata 
  (Mousson) 
  1865. 
  

  

  Publication 
  of 
  the 
  independent 
  investigation 
  by 
  Hubendick 
  of 
  

   shells 
  and 
  animals 
  in 
  the 
  collections 
  of 
  the 
  Bernice 
  P. 
  Bishop 
  Museum 
  

   has 
  brought 
  to 
  my 
  attention 
  the 
  following 
  synonymy: 
  

  

  Ampullacera 
  maculata 
  Mousson 
  (1865, 
  p. 
  203). 
  

  

  Ampullacera 
  maculata 
  Crosse 
  (1865, 
  p. 
  432, 
  pi. 
  14, 
  fig. 
  10). 
  

  

  Ampullarina 
  maculata 
  Nevill 
  (1878, 
  p. 
  249). 
  

  

  Salinator 
  maculata 
  Hubendick 
  (1945, 
  p. 
  108). 
  

  

  Fijidoma 
  laddi 
  Morrison 
  (Jan. 
  1952, 
  p. 
  8). 
  

  

  Veloplacenta 
  maculata 
  Hubendick 
  (Aug. 
  1952, 
  pp. 
  179-184, 
  pi. 
  1). 
  

  

  In 
  this 
  species 
  the 
  body 
  whorl 
  is 
  enormous, 
  so 
  that 
  the 
  height 
  of 
  

   the 
  spire 
  is 
  less 
  than 
  one-fourth 
  the 
  height 
  of 
  the 
  aperture. 
  The 
  

   aperture 
  is 
  roughly 
  semicircular, 
  with 
  both 
  upper 
  and 
  lower 
  (anterior 
  

   and 
  posterior) 
  angles 
  well 
  rounded. 
  Nuclear 
  ^^whorls 
  ■ 
  smooth; 
  early 
  

   postnuclear 
  whorls 
  sculptured 
  by 
  incised 
  spiral 
  lines 
  between 
  broad, 
  

   flat 
  rib-areas, 
  crossed 
  by 
  microscopically 
  fine 
  (cuticular) 
  growth 
  lines. 
  

   The 
  spiral 
  sculpture 
  becomes 
  obsolete 
  or 
  absent 
  on 
  the 
  body 
  whorl, 
  

   persisting 
  longest 
  just 
  below 
  the 
  suture 
  and 
  in 
  the 
  columellar 
  region. 
  

   The 
  columella 
  is 
  rather 
  straight, 
  broad, 
  heavily 
  callused, 
  and 
  flattened 
  

   or 
  a 
  little 
  excavated, 
  in 
  contrast 
  to 
  the 
  even 
  curve 
  of 
  the 
  thin 
  outer 
  

   lip. 
  The 
  shells 
  are 
  reddish 
  horn 
  with 
  regular 
  flammules 
  or 
  equivalent 
  

   rows 
  of 
  minute 
  squarish 
  dots 
  of 
  red 
  in 
  the 
  ground 
  color. 
  The 
  broad 
  

   columella 
  is 
  whitish. 
  Embryonic 
  shells 
  of 
  3 
  whorls 
  are 
  globular, 
  

   smooth 
  except 
  for 
  growth 
  lines, 
  and 
  even 
  at 
  this 
  early 
  stage 
  possess 
  

   a 
  heavy, 
  callused, 
  but 
  not 
  flattened 
  columella. 
  (See 
  pi. 
  11, 
  fig. 
  18.) 
  

  

  The 
  holotype 
  of 
  F. 
  laddi 
  (USNM 
  597433) 
  and 
  a 
  number 
  of 
  paratypes 
  

   (USNM 
  532559) 
  were 
  collected 
  from 
  rocks 
  in 
  a 
  swift 
  stream, 
  the 
  Lami 
  

   River, 
  on 
  Viti 
  Levu, 
  Fiji 
  Islands, 
  May 
  30, 
  1926, 
  by 
  Dr. 
  H. 
  S. 
  Ladd 
  

   of 
  the 
  U. 
  S. 
  Geological 
  Survey. 
  

  

  The 
  holotype 
  of 
  laddi 
  has 
  3 
  whorls 
  remaining, 
  and 
  measures 
  as 
  

   follows: 
  Height, 
  9.2 
  mm.; 
  diameter, 
  8.2 
  mm.; 
  aperture 
  height, 
  8.0 
  

   mm. 
  ; 
  aperture 
  diameter, 
  5.8 
  mm. 
  The 
  flat, 
  white 
  columella 
  is 
  1.5 
  mm. 
  

   wide. 
  

  

  Comparison 
  of 
  all 
  available 
  figures 
  and 
  specimens 
  has 
  shown 
  thai 
  

   there 
  is 
  only 
  one 
  described 
  species 
  of 
  Fijidoma. 
  It 
  has 
  been 
  recorded 
  

   to 
  date 
  from 
  the 
  upstream, 
  swiftly 
  flowing 
  waters 
  of 
  the 
  Rewa 
  River 
  

   and 
  Lami 
  River 
  systems 
  on 
  Vit 
  Levu. 
  

  

  