﻿FAUNA. 
  339 
  

  

  The 
  trapezoides 
  is 
  the 
  most 
  common 
  and 
  widely 
  dis- 
  

   persed 
  species. 
  The 
  purpuratus 
  (Ater, 
  or 
  lugubris), 
  An- 
  

   adontoides 
  (or 
  teres), 
  and 
  the 
  Silhquoides 
  are 
  abundant. 
  

  

  Of 
  the 
  Univalves, 
  we 
  have 
  the 
  

  

  Paludina, 
  Lymnaea, 
  

  

  Planorbis, 
  and 
  

  

  Melania, 
  Succinea. 
  

  

  The 
  paludina 
  only 
  is 
  found 
  in 
  any 
  abundance. 
  The 
  

   melanias 
  appear 
  to 
  be 
  very 
  rare. 
  The 
  lymngea 
  and 
  

   succinea 
  occur 
  in 
  the 
  fossil 
  state, 
  associated 
  with 
  the 
  

   helices 
  in 
  the 
  mastodon 
  bone-beds. 
  

  

  Helices, 
  or 
  Snails. 
  

  

  Among 
  those 
  now 
  found 
  living, 
  Those 
  found 
  fossil, 
  are 
  — 
  

  

  I 
  enumerate 
  the 
  following: 
  — 
  Helix 
  albolabris. 
  

  

  Helix 
  alteruata. 
  concava. 
  

  

  auriculata. 
  elevata. 
  

  

  ■ 
  fraterna. 
  profunda. 
  

  

  hirsuta. 
  perspectiva. 
  

  

  interna. 
  palliata. 
  

  

  pulchella. 
  Sayi. 
  

  

  tridentata. 
  thyroides. 
  

  

  helicina. 
  

  

  CRUSTACEANS. 
  

  

  Our 
  collection 
  in 
  this 
  department 
  is 
  yet 
  very 
  limited. 
  

   I 
  enumerate 
  at 
  present 
  only 
  the 
  following: 
  — 
  

  

  SCIENTIFIC 
  NAME. 
  POPULAR 
  NAME. 
  

  

  Loligo 
  punctata. 
  Cuttle 
  fish. 
  

  

  Polyphemus 
  occidentales. 
  Horse-foot 
  crab. 
  

  

  Lupa 
  dicantha. 
  Common 
  edible 
  crab. 
  

  

  Gelasimus 
  vocans. 
  Fiddler 
  crab. 
  

  

  Ocypode 
  arenaria. 
  Small 
  sand-crab. 
  

  

  