﻿GLOCHIDIA 
  OF 
  FEESH-WATER 
  MUSSELS. 
  5 
  

  

  This 
  glocliidmm 
  is 
  identical 
  in 
  size 
  with 
  multiradiata, 
  but 
  the 
  hinge 
  

   line 
  is 
  straighter, 
  and 
  the 
  constriction 
  of 
  the 
  outhne 
  below 
  hinge, 
  at 
  

   either 
  side, 
  is 
  characteristic. 
  Compared 
  with 
  Q. 
  'pustulosa, 
  with 
  which 
  

   it 
  agrees 
  in 
  size, 
  the 
  hinge 
  line 
  is 
  much 
  longer 
  than 
  in 
  that 
  species 
  

   while 
  the 
  outline 
  in 
  i)ustulosah&\o^ 
  the 
  hinge 
  Une 
  is 
  straight. 
  Host 
  

   unknown. 
  

  

  Lamfsilis 
  lienosa 
  unicostata 
  B. 
  H. 
  Wright. 
  [Fig. 
  15.] 
  

  

  White 
  River, 
  Clarendon, 
  Ark., 
  October 
  20, 
  1913. 
  Collected 
  by 
  

  

  W. 
  B. 
  Gorham; 
  collection 
  of 
  United 
  States 
  Biological 
  Laboratory, 
  

  

  no. 
  G-75. 
  

  

  SemielUptical 
  in 
  shape; 
  short 
  in 
  proportion 
  to 
  depth; 
  ventral 
  

  

  margin 
  rounded 
  ; 
  hinge 
  line 
  long 
  and 
  but 
  slightly 
  curved 
  ; 
  size 
  medium, 
  

  

  0.185 
  by 
  0.240 
  mm. 
  

  

  In 
  general 
  outline 
  this 
  glochidium 
  is 
  of 
  the 
  type 
  represented 
  by 
  

  

  Lampsilis 
  trabalis 
  and 
  Ohovaria 
  circulus, 
  being 
  intermediate 
  in 
  size 
  

  

  between 
  these 
  two 
  species, 
  but 
  probably 
  nearer 
  trabalis 
  in 
  form, 
  

  

  particularly 
  in 
  the 
  rather 
  obliquely 
  rounded 
  posterior 
  margin. 
  

  

  Host 
  unknown. 
  

  

  Lampsilis 
  multiradiata 
  Lea. 
  [Fig. 
  2.] 
  

  

  Auglaize 
  River, 
  Defiance, 
  Ohio, 
  July 
  22, 
  1913. 
  Collected 
  by 
  

   H. 
  Walton 
  Clark; 
  collection 
  of 
  United 
  States 
  Biological 
  Laboratory, 
  

   no. 
  G-70. 
  

  

  LamjJsilis 
  type; 
  semielliptical; 
  ventral 
  margin 
  rounded; 
  hmge 
  line 
  

   short 
  and 
  evenly 
  curved; 
  size 
  large, 
  0.230 
  by 
  0.290 
  mm. 
  

  

  But 
  for 
  the 
  much 
  longer 
  hmge 
  Ime 
  and 
  larger 
  adductor 
  this 
  could 
  

   hardly 
  be 
  distinguished 
  from 
  average 
  examples 
  of 
  Quadrula 
  pustulosa, 
  

   as 
  it 
  agrees 
  in 
  size 
  with 
  that 
  form. 
  Host 
  unlviiown. 
  

  

  Lampsilis 
  parva 
  Barnes. 
  [Fig. 
  3.1 
  

  

  Pond 
  near 
  Tulsa, 
  Okla., 
  July 
  20, 
  1911. 
  Collected 
  by 
  F. 
  B. 
  Isely; 
  

   collection 
  of 
  United 
  States 
  Biological 
  Laboratory, 
  no. 
  G-67. 
  

  

  Glochidium 
  semielliptical; 
  ventral 
  margin 
  rounded; 
  hmge 
  line 
  

   moderately 
  short 
  and 
  evenly 
  curved; 
  size 
  medium, 
  0.170 
  by 
  0.200 
  mm. 
  

  

  In 
  general 
  outline 
  this 
  glochidium 
  strongly 
  suggests 
  that 
  of 
  L. 
  liga- 
  

   mentina, 
  from 
  which 
  it 
  differs 
  in 
  bemg 
  much 
  smaller 
  and 
  in 
  having 
  a 
  

   differently 
  shaped 
  adductor; 
  in 
  size 
  it 
  approaches 
  nearest 
  Q. 
  metanevra, 
  

   which 
  has 
  a 
  short 
  hinge 
  line, 
  and 
  L. 
  anodontoides, 
  in 
  which 
  the 
  hinge 
  

   line 
  is 
  sHghtly 
  depressed. 
  Host 
  unknown. 
  

  

  Lampsilis 
  picta 
  Lea. 
  [Fig. 
  4.1 
  

  

  Cumberland 
  River, 
  Burnside, 
  Ky., 
  July 
  14, 
  1911. 
  Collected 
  by 
  

   H. 
  Walton 
  Clark; 
  collection 
  of 
  United 
  States 
  Biological 
  Laboratory, 
  

   no. 
  G-64. 
  

  

  Glochidium 
  semielliptical 
  ; 
  ventral 
  margin 
  rounded 
  ; 
  hinge 
  line 
  short, 
  

   slightly 
  curved, 
  and 
  faintly 
  undulate; 
  size 
  large, 
  0.240 
  by 
  0.300 
  mm. 
  

  

  