﻿Description 
  of 
  a 
  New 
  Species 
  of 
  Fuligula. 
  219 
  

  

  Found 
  in 
  running 
  streams, 
  living 
  with 
  the 
  Cyclas 
  trun- 
  

   cata 
  and 
  Pisidium 
  dubium. 
  

  

  PisiDiuiM 
  CoMPRESSUM. 
  Plate 
  VI. 
  

  

  P. 
  testa 
  minute, 
  compressa, 
  perobliqua, 
  triangularis, 
  pos- 
  

   tice 
  abrupt!, 
  albl, 
  nitida, 
  tenuiter 
  striata, 
  natibus 
  parvis 
  

   apiculatis. 
  

  

  Long. 
  0.16; 
  Lat. 
  0.14; 
  Diam. 
  0.9. 
  

  

  Shell 
  small, 
  somewhat 
  oblique, 
  compressed, 
  triangular, 
  

   posteriorily 
  abrupt, 
  slightly 
  striated, 
  epidermis 
  very 
  light, 
  

   color 
  pale 
  yellow, 
  beaks 
  small, 
  slightly 
  elevated, 
  depressed 
  at 
  

   the 
  summit. 
  Hab. 
  Massachusetts. 
  

  

  This 
  species 
  somewhat 
  resembles^ 
  the 
  young 
  of 
  the 
  Pisi- 
  

   dium 
  dubium, 
  but 
  is 
  somewhat 
  more 
  compressed, 
  and 
  its 
  

   beaks 
  are 
  likewise 
  less 
  elevated. 
  

  

  Found 
  in 
  company 
  with 
  the 
  Pisidium 
  dubium 
  and 
  tha 
  

   Cyclas 
  minor. 
  

  

  Description 
  of 
  a 
  New 
  Species 
  of 
  the 
  genus 
  Fuligula. 
  

   By 
  John 
  G. 
  Bell. 
  Read 
  30th 
  Aug. 
  1851. 
  

  

  Violet, 
  Bqck 
  — 
  Fuligula 
  viola. 
  

  

  Specific 
  Characters. 
  — 
  Length 
  30 
  inches 
  ; 
  extent 
  43 
  inches. 
  

   Bill 
  dull 
  yellow, 
  black 
  at 
  tip 
  and 
  base 
  ; 
  head 
  and 
  neck 
  violet, 
  

   changeable 
  to 
  glossy 
  green 
  ; 
  irrides 
  hazel. 
  Foreneck 
  and 
  

   breast 
  dark 
  chesnut 
  ; 
  back, 
  rump 
  and 
  upper 
  tail 
  coverts, 
  me- 
  

   talic 
  green 
  ; 
  wings 
  brown, 
  slightly 
  glossed 
  with 
  dull 
  green 
  ; 
  

   primaries 
  tipped 
  with 
  violet 
  ; 
  tail 
  light 
  sooty 
  brown, 
  shaded 
  

   with 
  violet, 
  except 
  the 
  four 
  centre 
  feathers, 
  which 
  are 
  shaded 
  

   with 
  green 
  ; 
  greater 
  wing 
  coverts, 
  light 
  ash; 
  smaller 
  under 
  

   wing 
  coverts, 
  brownish 
  ash, 
  barred 
  and 
  largely 
  tipped 
  with 
  

   white; 
  axillars 
  dark 
  ash, 
  minutely 
  spotted 
  and 
  tipped 
  with 
  

  

  