﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  243 
  

  

  , 
  Val'^ata 
  tricarinata 
  Say 
  1822 
  (Fig. 
  168). 
  Cyclostoma 
  

   tricarinata 
  Say 
  (1817. 
  Acad. 
  not. 
  sci. 
  Phil. 
  Jour, 
  i 
  :i|). 
  V 
  a 
  1 
  - 
  

   vata 
  tricarinata 
  Say. 
  (1822. 
  Acad. 
  nat. 
  sci. 
  Phil. 
  four. 
  2:173) 
  

  

  Shell 
  with 
  four 
  whorls, 
  bearing 
  three 
  prominent 
  cari- 
  

   nae; 
  growth 
  lines 
  low 
  and 
  indistinct; 
  suture 
  well 
  im- 
  

   pressed; 
  umbilicus 
  large 
  and 
  deep, 
  showing 
  the 
  whorls 
  

   to 
  the 
  apex 
  ; 
  revolving 
  lines 
  or 
  carinae 
  placed 
  one 
  on 
  the 
  

   upper 
  edge, 
  one 
  on 
  the 
  lower 
  edge, 
  and 
  one 
  on 
  the 
  base. 
  Fig. 
  les 
  vai- 
  

  

  Found 
  in 
  Goat 
  island 
  gravel 
  pits. 
  As 
  a 
  recent 
  shell, 
  ^f* 
  *'^^"^'''°^**- 
  

   it 
  is 
  very 
  common 
  in 
  the 
  river 
  and 
  its 
  tributary 
  streams. 
  

  

  Valvata 
  sincera 
  Say 
  (Fig. 
  175). 
  Valvata 
  sincera 
  Say 
  

   (Long's 
  expedition, 
  p. 
  264, 
  pi. 
  15, 
  fig. 
  11) 
  

  

  This 
  shell 
  is 
  more 
  globose 
  than 
  the 
  foregoing 
  and 
  

   has 
  four 
  whorls, 
  rounded 
  and 
  finely 
  wrinkled; 
  aperture 
  

   round, 
  not 
  diminishing 
  in 
  thickness 
  at 
  the 
  point 
  of 
  

   contact; 
  umbilicus 
  large, 
  exhibiting 
  the 
  whorls 
  to 
  the 
  

   apex. 
  

  

  Bincera!^!*^''^'* 
  Fouud 
  associatcd 
  with 
  V. 
  tricar 
  i^nata 
  in 
  the 
  

   gravel 
  on 
  Goat 
  island. 
  

  

  V. 
  s 
  i 
  n 
  c 
  e 
  r 
  a 
  is 
  not 
  found 
  in 
  Niagara 
  river 
  at 
  the 
  present 
  time, 
  

   nor 
  is 
  it 
  found 
  in 
  the 
  immediate 
  vicinity. 
  Lime 
  lake 
  is 
  the 
  only 
  

   locality 
  within 
  a 
  radius 
  of 
  50 
  miles 
  known 
  to 
  the 
  writer 
  for 
  this 
  

   species. 
  

  

  Genus 
  CAMPELOMARafinesque 
  

  

  Animal 
  with 
  a 
  large 
  foot; 
  head 
  of 
  moderate 
  size, 
  situated 
  some- 
  

   what 
  back 
  from 
  the 
  end 
  of 
  the 
  foot. 
  Shell 
  thick 
  and 
  solid, 
  oval; 
  

   spire 
  somewhat 
  produced; 
  surface 
  smooth 
  and 
  rounded; 
  lip 
  simple 
  

   and 
  continuous; 
  columellar 
  side 
  entirely 
  covers 
  the 
  um- 
  

   bilicus. 
  

  

  Campeloma 
  decisa 
  Say 
  181 
  7 
  (Fig. 
  170). 
  L 
  i 
  m 
  n 
  a 
  e 
  a 
  

   d 
  e 
  c 
  i 
  s 
  a 
  Say 
  (181 
  7. 
  Nich. 
  enc. 
  Am. 
  ed. 
  i) 
  

  

  Shell 
  imperforate 
  or 
  nearly 
  so, 
  oval 
  with 
  a 
  smooth 
  sur-p^j^'^^^*J|: 
  

   face; 
  whorls 
  five, 
  rounded, 
  last 
  whorl 
  slightly 
  shouldered 
  ®^ 
  

   at 
  the 
  suture; 
  aperture 
  oval; 
  lip 
  simple 
  with 
  a 
  callus 
  on 
  the 
  colum- 
  

   ellar 
  side. 
  

  

  Locality. 
  Goat 
  island 
  gravel 
  pit. 
  

  

  Genus 
  limnaea 
  Lamarck. 
  1798 
  

  

  Animal 
  provided 
  with 
  a 
  broad 
  head 
  and 
  flattened 
  triangular 
  ten- 
  

   tacles; 
  mantle 
  thickened 
  in 
  front; 
  foot 
  broad 
  and 
  flat. 
  Shell 
  dex- 
  

   tral, 
  spire 
  oblong; 
  aperture 
  large 
  and 
  wide; 
  the 
  outer 
  lip 
  is 
  simple, 
  

   the 
  inner 
  has 
  a 
  fold 
  on 
  the 
  columella. 
  

  

  