﻿84 
  ON 
  THE 
  NAIADES, 
  

  

  seven 
  are 
  on 
  the 
  outer 
  lip 
  — 
  the 
  last 
  of 
  these 
  and 
  the 
  first 
  on 
  the 
  colum- 
  

   ella 
  are 
  the 
  largest. 
  The 
  deep 
  brown 
  of 
  the 
  throat 
  is 
  visible 
  through 
  

   the 
  shell. 
  In 
  some 
  specimens 
  there 
  is 
  a 
  finely 
  mottled 
  appearance 
  

   over 
  the 
  lower 
  whorls 
  of 
  the 
  shell. 
  The 
  white 
  line 
  along 
  the 
  suture 
  is 
  

   placed 
  on 
  the 
  upper 
  part 
  of 
  the 
  whorl. 
  The 
  outline 
  of 
  the 
  shell 
  is 
  

   remarkably 
  fusiform. 
  

  

  Cyclostoma 
  striata. 
  Plate 
  XIX. 
  fig. 
  77. 
  

  

  Testa 
  depressd, 
  planulatd, 
  multistriatd, 
  alba, 
  pellucidd, 
  latissime 
  umbilicatd 
  ; 
  

   anfractibus 
  quaternis 
  ; 
  apice 
  acuminato, 
  rufo 
  ; 
  labro 
  acuto 
  ; 
  operculo 
  corneo 
  

   tenuique. 
  

  

  Shell 
  depressed, 
  flattened, 
  much 
  striate, 
  white, 
  translucent, 
  very 
  widely 
  umbilicate 
  ; 
  

   whorls 
  four 
  ; 
  apex 
  red 
  and 
  pointed 
  ; 
  lip 
  sharp 
  ; 
  operculum 
  thin 
  and 
  horny. 
  

  

  Hab. 
  Peru. 
  Lieutenant 
  Humphreys. 
  

   Cabinet 
  of 
  the 
  Academy 
  of 
  Natural 
  Sciences 
  of 
  Philadelphia. 
  

   Diam. 
  -9, 
  Length 
  *5 
  of 
  an 
  inch. 
  

  

  Remarks. 
  — 
  This 
  shell 
  was 
  brought 
  by 
  lieutenant 
  Humphreys 
  from 
  

   South 
  America, 
  and 
  presented, 
  with 
  many 
  other 
  fine 
  specimens, 
  to 
  the 
  

   Academy. 
  It 
  resembles 
  the 
  C. 
  Jamaicensis 
  (Fer.) 
  ; 
  but 
  is 
  much 
  larger, 
  

   and 
  has 
  finer 
  striae. 
  The 
  rotundity 
  of 
  the 
  mouth 
  is 
  slightly 
  modified 
  

   by 
  the 
  junction 
  of 
  the 
  superior 
  part 
  with 
  the 
  columella. 
  

  

  Achatina 
  Vanuxemensis. 
  Plate 
  XIX. 
  fig. 
  78. 
  

  

  Testd 
  fusiformi, 
  tenui, 
  pellucidd, 
  longitudinaliter 
  et 
  transversim 
  striatd, 
  luted, 
  

   in 
  anfractum 
  infernum 
  obsolete 
  albo-maculatd 
  ; 
  suturis 
  granulatis 
  ; 
  canali 
  baseos 
  

   curvo. 
  

  

  Shell 
  fusiform, 
  thin, 
  pellucid, 
  longitudinally 
  and 
  transversely 
  striate, 
  ochre 
  coloured, 
  

   with 
  indistinct 
  white 
  spots 
  on 
  the 
  body 
  whorl 
  ; 
  sutures 
  granulate 
  ; 
  channel 
  curved 
  at 
  

   the 
  base. 
  

  

  