﻿10 
  MUSSEL 
  RESOUECES 
  OF 
  THE 
  ILLINOIS 
  RIVER. 
  

  

  Common 
  name. 
  Scientific 
  name. 
  

  

  Maple-leaf, 
  stranger 
  Quadrula 
  lachrymosa 
  (Lea). 
  

  

  Monkey-face 
  Quadrula 
  metanevra 
  (Raf 
  .). 
  

  

  Washboard 
  Quadrula 
  heros 
  (Say). 
  

  

  Blue-point 
  Quadrula 
  undulata 
  (Barnes). 
  

  

  Three-ridge 
  Quadrula 
  plicata 
  (Say). 
  

  

  Bull-head 
  Pleurobema 
  seeopus 
  (Green). 
  

  

  Elephant 
  ear 
  Unio 
  crassidens 
  (Lea). 
  

  

  Lady-finger, 
  spike 
  Unio 
  gibbosus 
  (Barnes). 
  

  

  Spectacle-case 
  Margaritana 
  monodonta 
  (Say). 
  

  

  WTiite 
  heel-splitter 
  Symphynota 
  complanata 
  (Barnes). 
  

  

  Fluted 
  shell 
  Symphynota 
  costata 
  (Raf.). 
  

  

  Rock-shell, 
  bastard, 
  queen 
  Arcidens 
  confragosus 
  (Say). 
  

  

  Anodonta 
  corpulenta 
  (Cooper). 
  

   Floater 
  Anodonta 
  grandis 
  (Say). 
  

  

  Anodonta 
  suborbiculata 
  (Say). 
  

  

  Anodonta 
  imbicillis 
  (Say). 
  

  

  Squaw-foot 
  Strophitus 
  edentidus 
  (Say). 
  

  

  Three-horned 
  shell 
  Obliquaria 
  reflexa 
  (Raf.). 
  

  

  Buck-horn, 
  pistol-grip 
  Tritogonia 
  tuberculata 
  (Barnes). 
  

  

  Little 
  pocketbook 
  Plagiola 
  donaciformis 
  (Lea). 
  

  

  Deer-toe 
  Plagiola 
  elegans 
  (Lea). 
  

  

  Butterfly 
  Plagiola 
  seciiris 
  (Lea). 
  

  

  Missouri 
  niggerhead 
  Obovaria 
  ellipsis 
  (Lea). 
  

  

  Paper-shell 
  Lampsilis 
  Isevissima 
  (Lea). 
  

  

  Lampsilis 
  gracilis 
  (Barnes). 
  

   Pink 
  hatchet-back 
  Lampsilis 
  alata 
  (Say). 
  

  

  Lampsilis 
  parva 
  (Barnes). 
  

  

  Black 
  sand-shell 
  Lampsilis 
  recta 
  (Lam.). 
  

  

  Slough 
  sand-shell 
  Lampsilis 
  fallaciosa 
  (Smith). 
  

  

  Yellow 
  sand-shell 
  Lampsilis 
  anodontoides 
  (Lea). 
  

  

  Higgins-eye 
  Lampsilis 
  higginsii 
  (Lea). 
  

  

  Lampsilis 
  orbiculata 
  (Hildreth). 
  

  

  Mucket 
  Lampsilis 
  ligamentina 
  (Lam.). 
  

  

  Fat 
  mucket 
  Lampsilis 
  luteola 
  (Lam.). 
  

  

  Pocketbook 
  Lampsilis 
  capax 
  (Green). 
  

  

  Lampsilis 
  ventricosa 
  (Barnes). 
  

  

  COMMERCIAL 
  APPRAISAL 
  OF 
  QUANTITY 
  OF 
  SHELLS. 
  

  

  The 
  following 
  table 
  shows, 
  in 
  a 
  general 
  way, 
  the 
  number 
  of 
  shells 
  

   to 
  a 
  given 
  weight 
  at 
  four 
  representative 
  stations 
  where 
  the 
  difference 
  

   in 
  size 
  was 
  very 
  evident. 
  The 
  computation 
  is 
  based 
  upon 
  counts 
  

   of 
  10 
  pounds 
  of 
  shells 
  in 
  each 
  case, 
  and 
  the 
  figures 
  represent 
  the 
  num- 
  

   ber 
  of 
  pairs 
  of 
  shells. 
  At 
  Chillicothe 
  the 
  shells 
  for 
  the 
  test 
  were 
  from 
  

   a 
  65-ton 
  pile; 
  at 
  Meredosia, 
  from 
  a 
  10-ton 
  pile; 
  at 
  Florence, 
  from 
  a 
  

   16-ton 
  pile; 
  and 
  at 
  Hardin, 
  from 
  a 
  5-ton 
  pile. 
  The 
  mixed 
  shells 
  

   were 
  other 
  commercial 
  species 
  taken 
  from 
  the 
  same 
  piles. 
  The 
  

   decrease 
  in 
  size 
  between 
  the 
  shells 
  from 
  Chillicothe 
  and 
  those 
  from 
  

   Hardin 
  is 
  more 
  than 
  50 
  per 
  cent 
  for 
  the 
  washboards 
  and 
  tlu'ee-ridges, 
  

   and 
  sUghtly 
  more 
  than 
  25 
  per 
  cent 
  for 
  the 
  blue-points. 
  

  

  