﻿NIAGARA 
  FALLS 
  AND 
  VICINITY 
  

  

  249 
  

  

  Shell 
  large, 
  oblong, 
  ovate, 
  compressed 
  and 
  comparatively 
  thin; 
  

   surface 
  regularly 
  and 
  smoothly 
  marked 
  by 
  growth 
  lines; 
  anterior 
  

   end 
  rounded, 
  posterior 
  end 
  slightly 
  angulated; 
  dorsal 
  margins 
  

   straight 
  or 
  nearly 
  so, 
  hollowed 
  a 
  little 
  back 
  of 
  the 
  beaks; 
  ventral 
  

   margin 
  straight; 
  adductor 
  muscle 
  impressions 
  well 
  defined; 
  cardinal 
  

   teeth 
  not 
  large, 
  two 
  on 
  the 
  left 
  valve 
  and 
  one 
  on 
  the 
  right; 
  lateral 
  

   teeth 
  delicate 
  ; 
  beak, 
  in 
  present 
  specimen, 
  smooth, 
  slightly 
  sculptured 
  

   in 
  recent 
  specimens. 
  

  

  Locality. 
  Goat 
  island. 
  

  

  Lampsilis 
  ellipsiformis 
  (Conrad) 
  Simpson 
  1900 
  (Fig. 
  185). 
  

   Unio 
  ellipsiformis 
  Conrad 
  (1836. 
  Monograph, 
  8 
  :6o) 
  

   Unio 
  spathulatus 
  Lea 
  (1845. 
  ^"^- 
  philos. 
  soc. 
  Proc. 
  4:164) 
  

   Lampsilis 
  ellipsiformis 
  Simpson 
  (1900. 
  U. 
  S. 
  naf. 
  mus, 
  

  

  Proc. 
  22:SS7) 
  

  

  Shell 
  oblong, 
  very 
  compressed, 
  rounded 
  both 
  anteriorly 
  and 
  pos- 
  

   teriorly; 
  surface 
  slightly 
  roughened 
  by 
  the 
  growth 
  lines; 
  dorsal 
  

  

  Fig. 
  183 
  Lampsilis 
  ellipsiformis 
  

  

  margins 
  curved; 
  ventral 
  margins 
  angulated 
  toward 
  the 
  posterior 
  

   end; 
  anterior 
  adductor 
  muscle 
  impression 
  deep 
  and 
  triangular, 
  

   slightly 
  pitted; 
  posterior 
  muscle 
  scar 
  broad 
  and 
  oval, 
  showing 
  the 
  

   ray-like 
  growth 
  lines; 
  hinge 
  area 
  broad 
  and 
  flat; 
  teeth 
  strong, 
  

   both 
  cardinal 
  and 
  lateral, 
  there 
  being 
  two 
  cardinal 
  teeth 
  in 
  each 
  

   valve, 
  two 
  lateral 
  teeth 
  in 
  the 
  left 
  valve 
  and 
  one 
  in 
  the 
  right; 
  hinge 
  

   area 
  between 
  the 
  cardinal 
  and 
  lateral 
  teeth 
  broad 
  and 
  very 
  slightly 
  

   undulated; 
  pallial 
  line 
  well 
  impressed; 
  beaks 
  low, 
  showing 
  no 
  sculp- 
  

   ture, 
  though 
  recent 
  specimens 
  show 
  delicate 
  waves 
  or 
  ridges. 
  

  

  Locality. 
  Found 
  in 
  Prospect 
  park 
  by 
  Prof. 
  Irving 
  P. 
  Bishop. 
  

  

  