﻿OLD 
  AND 
  NEW 
  WORLD 
  MELANIANS 
  — 
  MORRISON 
  383 
  

  

  slightly 
  forward. 
  The 
  operculum 
  is 
  of 
  the 
  paleomelanian 
  type, 
  of 
  

   many 
  (6 
  or 
  8) 
  turns, 
  and, 
  in 
  the 
  species 
  seen, 
  is 
  considerably 
  smaller 
  

   than 
  the 
  aperture. 
  The 
  perfect 
  apex 
  of 
  the 
  shell 
  (nuclear 
  whorl) 
  is 
  

   asymmetrical. 
  Specimens 
  of 
  the 
  animals 
  of 
  Brotia 
  baccata 
  (Gould) 
  

   and 
  the 
  adult 
  and 
  embryonic 
  shells 
  of 
  three 
  other 
  species 
  of 
  Brotia 
  

   from 
  the 
  Salween 
  River 
  of 
  Thailand 
  and 
  Burma 
  have 
  been 
  personally 
  

   examined. 
  In 
  the 
  species 
  baccata 
  there 
  is 
  a 
  well-developed, 
  deep 
  

   genital 
  groove 
  do\vn 
  the 
  right 
  side 
  of 
  the 
  foot 
  that 
  abruptly 
  turns 
  in- 
  

   ward 
  to 
  become 
  the 
  entrance 
  (or 
  "birth 
  pore") 
  of 
  the 
  brood 
  pouch. 
  

   This 
  brood 
  pouch 
  is 
  very 
  large, 
  crowded 
  with 
  a 
  great 
  many 
  relatively 
  

   small 
  young 
  of 
  uniform 
  size. 
  The 
  single 
  character 
  of 
  the 
  embryonic 
  

   shell, 
  or 
  the 
  apex 
  (when 
  perfect) 
  of 
  the 
  adult 
  shell, 
  that 
  characterizes 
  

   Brotia 
  is 
  the 
  asymmetry. 
  It 
  appears 
  as 
  if 
  each 
  shell 
  in 
  its 
  development 
  

   is 
  interfered 
  with 
  by 
  a 
  yolk 
  sac 
  (?) 
  in 
  the 
  position 
  of 
  the 
  apex 
  to 
  keep 
  

   that 
  apex 
  soft, 
  while 
  the 
  rest 
  of 
  the 
  embryonic 
  whorls 
  develop 
  nor- 
  

   mally 
  and 
  symmetrically, 
  and 
  then 
  the 
  apex 
  collapses 
  to 
  a 
  line 
  below 
  

   the 
  curve 
  of 
  spiral 
  symmetry. 
  This 
  may 
  very 
  well 
  be 
  connected 
  with 
  

   a 
  secondary 
  development 
  in 
  the 
  brood 
  pouch 
  to 
  insure 
  a 
  "nurse" 
  type 
  

   of 
  nutrition 
  of 
  the 
  young. 
  

  

  Synonyms 
  of 
  Brotia 
  include 
  Acrostoma 
  Brot 
  1874, 
  Brotella 
  Rovereto 
  

   1899, 
  Paracrostoma 
  Cossman 
  1900, 
  with 
  the 
  genotype 
  hugeli 
  Philippi, 
  

   and 
  Wanga 
  S. 
  F. 
  Chen 
  (1943, 
  p. 
  21), 
  based 
  on 
  the 
  species 
  Melania 
  

   henriettae 
  Gray 
  (1834, 
  pi. 
  13, 
  fig. 
  2). 
  In 
  this 
  connection 
  it 
  should 
  be 
  

   mentioned 
  that 
  the 
  original 
  figure 
  of 
  henriettae 
  is 
  poorly 
  drawn 
  and 
  

   does 
  not 
  show 
  the 
  generic 
  character 
  of 
  the 
  slightly 
  produced 
  columellar 
  

   angle 
  of 
  the 
  aperture. 
  This 
  fault 
  is 
  corrected 
  in 
  the 
  figure 
  of 
  the 
  

   holotype 
  published 
  by 
  Yen 
  (1942, 
  p. 
  204, 
  pi. 
  15, 
  fig. 
  66). 
  In 
  fact 
  it 
  is 
  

   possible 
  that 
  the 
  originally 
  published 
  locality 
  of 
  henriettae 
  ("China") 
  

   is 
  at 
  fault, 
  and 
  this 
  may 
  be 
  the 
  same 
  species 
  as 
  baccata 
  (Gould) 
  of 
  the 
  

   Salween 
  River 
  and 
  some 
  of 
  its 
  tributaries. 
  

  

  Genus 
  Fijidoma 
  Morrison, 
  1952 
  

  

  Genotype: 
  (Fijidoma 
  laddi 
  Morrison 
  19 
  52)= 
  Fijidoma 
  maculata 
  

   (Mousson) 
  1865, 
  by 
  original 
  designation. 
  

  

  Fijidoma 
  Morrison 
  (January 
  1952) 
  antedates 
  by 
  only 
  a 
  few 
  months 
  

   the 
  synonymous 
  generic 
  name 
  Veloplacenta 
  Hubendick 
  (August 
  1952), 
  

   which 
  was 
  based 
  on 
  the 
  same 
  species 
  of 
  thiarid 
  snail. 
  These 
  fresh- 
  

   water 
  snails 
  from 
  Viti 
  Levu 
  in 
  the 
  Fiji 
  Islands, 
  superficially 
  very 
  

   similar 
  in 
  shell 
  outline 
  to 
  those 
  of 
  the 
  southeast 
  Asiatic 
  genus 
  Paludo- 
  

   mus, 
  were 
  named 
  in 
  allusion 
  to 
  that 
  similarity. 
  They 
  have 
  rather 
  

   smooth, 
  subglobose, 
  neritiform 
  shells 
  with 
  a 
  few 
  rather 
  rapidly 
  in- 
  

   creasing, 
  well-rounded 
  whorls 
  separated 
  by 
  a 
  deep 
  suture. 
  The 
  shell 
  

   has 
  fine 
  spiral 
  sculpture 
  and 
  regular 
  flammules 
  or 
  rows 
  of 
  squarish 
  

   dots 
  (interrupted 
  flammules) 
  of 
  red 
  in 
  the 
  ground 
  color. 
  The 
  aper- 
  

  

  