﻿246 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  hinge 
  margin 
  narrow, 
  cardinal 
  teeth 
  very 
  small 
  or 
  rudimentary, 
  one 
  

   of 
  them 
  more 
  or 
  less 
  bifurcated, 
  one 
  cardinal 
  tooth 
  in 
  the 
  right 
  and 
  

   two 
  oblique 
  ones 
  in 
  the 
  left 
  valve; 
  lateral 
  teeth 
  compressed 
  and 
  

   lamelHform, 
  the 
  anterior 
  shortest; 
  ligament 
  short; 
  margins 
  plain; 
  

   muscular 
  impressions 
  scarcely 
  apparent 
  and 
  pallial 
  line 
  simple. 
  

  

  Sphaerium 
  striatinum 
  (Lam.) 
  Prime 
  1865 
  (Fig. 
  

   ^77)- 
  Cyclas 
  striatina 
  Lamarck 
  (1818. 
  

   Animaux 
  sans 
  vertebres, 
  5 
  :56o). 
  Sphaerium 
  

   striatinum 
  Prime 
  (1865. 
  Smith. 
  Misc. 
  coll. 
  

   no. 
  145, 
  p. 
  S7) 
  

  

  Shell 
  slight, 
  moderately 
  elongated, 
  somewhat 
  

  

  compressed, 
  and 
  inequilateral; 
  anterior 
  margin 
  

  

  Fig. 
  177 
  Sphaerium 
  striati- 
  rounded; 
  bcaks 
  full, 
  not 
  much 
  raised 
  and 
  not 
  

  

  sculptured; 
  sulcations 
  slight 
  and 
  irregular; 
  hinge 
  

  

  line 
  curved; 
  cardinal 
  teeth 
  small, 
  double, 
  and 
  of 
  the 
  same 
  size; 
  

  

  lateral 
  teeth 
  larger, 
  but 
  not 
  very 
  prominent. 
  

  

  Localities. 
  Found 
  in 
  all 
  the 
  deposits 
  on 
  Goat 
  island, 
  Foster's 
  

   flats, 
  etc. 
  

  

  This 
  little 
  bivalve 
  is 
  very 
  common 
  in 
  the 
  river 
  at 
  the 
  present 
  time. 
  

   It 
  is 
  not 
  difficult 
  to 
  understand 
  how 
  these 
  shells 
  were 
  deposited, 
  if 
  

   one 
  studies 
  the 
  life 
  and 
  habits 
  of 
  the 
  recent 
  forms. 
  The 
  streamlets 
  

   passing 
  among 
  the 
  rocks 
  that 
  form 
  the 
  Duf^erin 
  islands 
  will 
  be 
  

   found 
  to 
  contain 
  hundreds 
  of 
  these 
  small 
  shells. 
  The 
  bottoms 
  of 
  

   the 
  pools 
  formed 
  by 
  eddies 
  are 
  white 
  with 
  the 
  accumulation 
  of 
  dead 
  

   shells, 
  in 
  such 
  quantities 
  that 
  they 
  may 
  be 
  taken 
  up 
  by 
  the 
  shovelful. 
  

   Sphaerium 
  stamineum 
  (Conr.) 
  Prime 
  1865 
  (Fig. 
  178). 
  Cyclas 
  

   s 
  t 
  a 
  m 
  i 
  n 
  e 
  a 
  Conrad 
  (1834. 
  Am. 
  jour. 
  25 
  1342). 
  Sphaerium 
  

   stamineum 
  Prime 
  (1865. 
  Smith. 
  Misc. 
  coll. 
  no. 
  145, 
  p. 
  38) 
  

  

  Shell 
  oval, 
  full 
  and 
  inequilateral; 
  anterior 
  end 
  /^^^&^\ 
  

   abrupt; 
  posterior 
  end 
  somewhat 
  distended; 
  beaks 
  /r 
  ^^ 
  '^\ 
  

  

  full, 
  prominent 
  and 
  sometimes 
  sculptured; 
  striae 
  

   heavier 
  than 
  in 
  the 
  foregoing 
  species; 
  hinge 
  mar- 
  

   gin 
  more 
  curved; 
  cardinal 
  teeth 
  double, 
  and 
  not 
  \^ 
  "-^^ 
  

   very 
  distinct; 
  lateral 
  teeth 
  stronger. 
  

  

  In 
  this, 
  as 
  in 
  the 
  preceding 
  species, 
  specimenSstaminiJL. 
  I^***®"^'"™ 
  

   frequently 
  occur 
  in 
  which 
  the 
  hinge 
  is 
  reversed. 
  

  

  Localities. 
  Goat 
  island, 
  Prospect 
  park, 
  and 
  near 
  the 
  Whirlpool. 
  

  

  Recent 
  species 
  of 
  this 
  interesting 
  group 
  of 
  fresh-water 
  bivalves 
  

   abound 
  in 
  Niagara 
  river 
  and 
  its 
  tributaries. 
  While 
  they 
  prefer 
  the 
  

   soft 
  mud 
  at 
  the 
  bottom, 
  they 
  are 
  frequently 
  found 
  attached 
  to 
  the 
  

  

  