﻿338 
  

  

  FAUNA. 
  

  

  INVERTEBRATA. 
  

  

  Class 
  I.— 
  MOLLUSCA, 
  OR 
  SHELL-FISH. 
  

  

  Of 
  this 
  class 
  1113^ 
  observations 
  enable 
  me 
  to 
  give 
  but 
  

   little 
  more 
  than 
  a 
  catalogue 
  of 
  the 
  family 
  Unioniclre, 
  or 
  

   fresh-water 
  mussle, 
  and 
  this 
  is 
  as 
  yet 
  imperfect. 
  Our 
  

   collections 
  embrace 
  the 
  following 
  species 
  : 
  — 
  

  

  Remaeks. 
  — 
  Of 
  our 
  list 
  of 
  Uniones, 
  the 
  Mississippi- 
  

   ensis 
  and 
  Porrectus 
  are 
  newly 
  determined 
  species, 
  and 
  

   have 
  been 
  figured 
  and 
  described 
  by 
  Conrad, 
  in 
  the 
  

   Journal 
  of 
  the 
  Academy 
  of 
  Natural 
  Scie^ices. 
  

  

  