﻿240 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Goniobasis 
  livescens 
  Tryon 
  (1873. 
  Smith. 
  Misc. 
  coll. 
  no. 
  

  

  253. 
  P- 
  248) 
  

  

  Shell 
  oblong 
  and 
  ovate 
  ; 
  six 
  or 
  seven 
  whorls 
  ; 
  early 
  volu- 
  

   tions 
  slightly 
  keeled; 
  spire 
  acute; 
  sutures 
  impressed; 
  

   whorls 
  convex 
  and 
  crossed 
  by 
  plainly 
  marked 
  growth 
  

   lines; 
  lip 
  moderately 
  thin, 
  and 
  thin 
  callous 
  on 
  the 
  colum- 
  

   ella. 
  

  

  Fig. 
  i62Gon- 
  This 
  is 
  the 
  most 
  common 
  of 
  all 
  the 
  shells 
  occurring 
  in 
  

  

  ioba.sis 
  live- 
  

   scens 
  these 
  deposits 
  along 
  the 
  Niagara 
  river; 
  it 
  is 
  subject 
  to 
  

  

  great 
  variation. 
  

  

  Localities. 
  Goat 
  island, 
  Prospect 
  park, 
  Whirlpool, 
  etc. 
  

  

  Groniobasis 
  livescens 
  var. 
  niagarensis 
  (Lea) 
  Tryon 
  1873 
  (Fig. 
  

   163). 
  Melania 
  n 
  i 
  a 
  g 
  a 
  r 
  e 
  n 
  s 
  i 
  s 
  Lea 
  (1841. 
  Philos. 
  soc. 
  Phil. 
  

   Proc. 
  2:12). 
  Goniobasis 
  livescens 
  var. 
  niagarensis 
  

   Tryon 
  (Smith. 
  Misc. 
  coll. 
  no. 
  253, 
  p. 
  248) 
  

  

  Shell 
  conic, 
  obtuse, 
  thick 
  and 
  smooth; 
  spire 
  short, 
  whorls 
  five 
  or 
  

   six, 
  surrounded 
  by 
  a 
  sharp 
  keel, 
  which 
  clearly 
  marks 
  the 
  suture; 
  

   aperture 
  elhptic; 
  lip 
  thin; 
  columella 
  sHghtly 
  calloused. 
  

  

  Prof. 
  H. 
  A. 
  Pilsbry, 
  who 
  examined 
  

   these 
  shells, 
  writes 
  : 
  " 
  This 
  remarkable 
  | 
  /-^ 
  /% 
  

  

  form 
  differs 
  from 
  G. 
  livescens, 
  ^""^ 
  ( 
  .^^ 
  r"^ 
  

   and 
  var. 
  niagarensis, 
  in 
  the 
  per- 
  ^^S^ 
  ^^ 
  ^^ 
  

  

  sistence 
  of 
  the 
  peripheral 
  keel 
  to 
  the 
  ^..^ 
  ^^3 
  ^^^,^^^,,, 
  ^^esccns 
  var. 
  

   adult 
  stage, 
  producing 
  a 
  shell 
  contour 
  niagarensis 
  

   similar 
  to 
  A 
  n 
  c 
  u 
  1 
  o 
  s 
  a 
  c 
  a 
  r 
  i 
  n 
  a 
  t 
  a; 
  it 
  has 
  not 
  hitherto 
  been 
  de- 
  

   scribed 
  or 
  noticed 
  in 
  conchological 
  literature, 
  and 
  would 
  be 
  entitled 
  

   to 
  specific 
  rank 
  were 
  it 
  not 
  connected 
  by 
  intermediate 
  forms 
  with 
  

   var. 
  niagarensis". 
  

   Locality. 
  Goat 
  island. 
  

  

  Goniobasis 
  haldemani 
  Tryon 
  1865 
  (Fig. 
  164). 
  G. 
  

   h 
  a 
  1 
  d 
  e 
  m 
  a 
  n 
  i 
  Tryon. 
  (1865. 
  Am. 
  jour, 
  conch. 
  1 
  138) 
  

   >-| 
  Shell 
  elongated, 
  narrow 
  and 
  rather 
  thin; 
  eight 
  or 
  nine 
  

  

  L# 
  whorls, 
  which 
  are 
  flat, 
  smooth 
  and 
  separated 
  by 
  a 
  slightly 
  

   ^^ 
  impressed 
  suture; 
  aperture 
  small, 
  subrhomboidal; 
  lip 
  thin, 
  

   Fig. 
  164 
  moderatelv 
  incurved 
  on 
  the 
  columellar 
  side. 
  

  

  Goniobasis 
  -^ 
  

  

  haldemani 
  j^-^ 
  gj-accful 
  shcll 
  is 
  vcry 
  scarce 
  and 
  is 
  not 
  represented 
  

   in 
  the 
  recent 
  fauna. 
  

  

  Locality. 
  Goat 
  island. 
  

  

  