﻿82 
  ON 
  THE 
  NAIADES, 
  

  

  cies 
  with 
  which 
  I 
  am 
  acquainted 
  ; 
  but 
  what 
  eminently 
  distinguishes 
  

   it 
  is 
  the 
  subcoronate 
  apex 
  which, 
  as 
  far 
  as 
  we 
  yet 
  know, 
  is 
  peculiar 
  to 
  

   this 
  species. 
  The 
  body 
  whorl 
  nearly 
  envelopes 
  the 
  superior 
  ones. 
  

   When 
  examined 
  by 
  the 
  microscope, 
  transverse 
  striae 
  are 
  observed 
  to 
  

   cause 
  numerous 
  minute 
  depressions 
  on 
  its 
  surface. 
  

  

  Melanopsis 
  princeps. 
  Plate 
  XIX. 
  fig. 
  74. 
  

  

  Testa 
  acuto-elevatd, 
  Isevi, 
  rufo-fuscd, 
  obsolete 
  multimaculatd 
  ; 
  inferiori 
  anfractu 
  

   carinato, 
  dimidio 
  basali 
  transversim 
  striato 
  ; 
  apice 
  acuto 
  ; 
  anfractibus 
  plus 
  minus 
  

   quatuordecim, 
  plants 
  ; 
  aperturd 
  quintd 
  parte 
  tests. 
  

  

  Shell 
  acutely 
  elevated, 
  smooth, 
  transversely 
  striate 
  on 
  the 
  lower 
  half 
  of 
  the 
  body 
  

   whorl, 
  which 
  is 
  carinate, 
  reddish 
  brown, 
  with 
  numerous 
  indistinct 
  spots 
  ; 
  apex 
  acute 
  ; 
  

   whorls 
  about 
  fourteen, 
  flat 
  aperture 
  one-fifth 
  the 
  length 
  of 
  the 
  shell. 
  

  

  Hab. 
  Cape 
  of 
  Good 
  Hope. 
  

  

  My 
  Cabinet. 
  

   Diam. 
  *6, 
  Length 
  2-1 
  inches. 
  

  

  Remarks. 
  — 
  This 
  is 
  the 
  most 
  remarkable 
  species 
  of 
  the 
  genus 
  which 
  

   I 
  have 
  examined. 
  It 
  diners 
  from 
  any 
  described 
  species 
  in 
  its 
  great 
  

   elevation, 
  in 
  the 
  flatness 
  of 
  its 
  whorls, 
  in 
  its 
  being 
  covered 
  with 
  indis- 
  

   tinct 
  spots, 
  and 
  in 
  the 
  absence 
  of 
  a 
  large 
  callus 
  on 
  the 
  superior 
  part 
  of 
  

   the 
  inner 
  lip, 
  as 
  well 
  also 
  as 
  in 
  the 
  great 
  number 
  of 
  its 
  whorls. 
  The 
  

   spots 
  are 
  peculiar 
  in 
  being 
  chain-like, 
  alternately 
  darker 
  and 
  lighter. 
  

   The 
  operculum 
  is 
  horny, 
  like 
  that 
  of 
  the 
  genus 
  Melania. 
  

  

  Melanopsis 
  maculata. 
  Plate 
  XIX. 
  fig. 
  75. 
  

  

  Testd 
  fusiformi, 
  tenebroso-olivaced, 
  intus 
  fasciatd 
  ; 
  epidermide 
  maculata; 
  an- 
  

   fractibus 
  quaternis 
  ; 
  basi 
  subtruncatd 
  ; 
  columella 
  sine 
  callo 
  superno. 
  

  

  Shell 
  fusiform, 
  dark 
  olive, 
  banded 
  on 
  the 
  inside, 
  and 
  spotted 
  in 
  the 
  epidermis 
  ; 
  

   whorls 
  four 
  ; 
  base 
  but 
  slightly 
  truncate; 
  columella 
  not 
  thickened 
  above. 
  

  

  