﻿B18 
  

  

  PAL 
  B 
  >NTOLOGi* 
  OF 
  ILLINOIS. 
  

  

  MOLLUSCA 
  

  

  

  BR 
  ACH 
  IOPODA. 
  

  

  (.iM 
  a 
  CAMBROPHORIA, 
  King. 
  

  

  (amerophoria 
  Gotordi, 
  Worthen. 
  

  

  la. 
  View 
  of 
  dorsal 
  viilvi'; 
  b, 
  ventral 
  vh! 
  ■ 
  

   '."iiTHES, 
  February, 
  1882. 
  

  

  Bulletin 
  No. 
  1, 
  of 
  the 
  Illinois 
  G 
  -y. 
  p. 
  39. 
  

  

  sin 
  11 
  above 
  the 
  medium 
  si: 
  Uy 
  ovate 
  orsub- 
  

  

  ciroular 
  in 
  general 
  outline. 
  Dorsal 
  valve 
  nearly 
  cir- 
  

   cular, 
  a 
  ly 
  oonvez, 
  th< 
  

   being 
  aboul 
  one-third 
  the 
  distance 
  from 
  the 
  I 
  

   to 
  the 
  front 
  pari 
  ol 
  the 
  >h.]l. 
  umbo 
  <lr]>res8ed. 
  

   Ventral 
  valve 
  much 
  mon 
  . 
  and 
  the 
  beak 
  

   produced 
  b< 
  yond 
  that 
  of 
  the 
  dorsal 
  vi 
  

   strongly 
  recurved. 
  

  

  The 
  only 
  specimen 
  we 
  hai 
  -hell 
  

  

  is 
  an 
  interna] 
  oast, 
  with 
  a 
  I 
  I 
  ad- 
  

  

  hering 
  to 
  the 
  beaks. 
  Traces 
  of 
  ten 
  or 
  twelve 
  i 
  

   shallow 
  plications 
  can 
  be 
  Been 
  on 
  the 
  front 
  portion 
  

   <> 
  of 
  the 
  shell, 
  two 
  or 
  three 
  of 
  which 
  probably 
  extended 
  to 
  

   r*\ 
  'I" 
  beak 
  on 
  the 
  ventral 
  valve, 
  while 
  the 
  ol 
  

  

  S^A 
  ohsolctc 
  hcfoiv 
  reaching 
  the 
  cardinal 
  honlor. 
  I 
  

  

  2y 
  fine 
  longitudinal 
  Btriatdoi 
  ble 
  with 
  i 
  good 
  

  

  V 
  i 
  from 
  the 
  beak 
  to 
  thi 
  fr<»nt 
  98, 
  breadth 
  

  

  \^ 
  -2-1. 
  heighth 
  1 
  1 
  mill 
  

  

  licated 
  to 
  the 
  memory 
  of 
  Mr. 
  Win. 
  Oifford, 
  of 
  Pe< 
  

   III., 
  from 
  whom 
  the 
  

  

  . 
  mi, 
  l 
  l 
  Middle 
  Coal 
  V 
  ar 
  Alia. 
  L 
  

  

  county, 
  111. 
  

  

  Hi. 
  n. 
  

  

  