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  6. 
  Family 
  Caecidae 
  . 
  (Lat 
  . 
  caecus, 
  blind; 
  caecum, 
  blind 
  gut.) 
  

  

  ^ 
  ) 
  Genus 
  ^ 
  a 
  ecum 
  F 
  lemi 
  ng 
  

   1817. 
  (Neuter.l 
  

  

  "b 
  ) 
  G 
  enus 
  Meioce 
  ras 
  Car 
  - 
  

   penter 
  1858 
  . 
  fGr 
  . 
  

   meion, 
  smaller 
  -^ 
  

   ceras, 
  horn. 
  Consi- 
  

   dered 
  "by 
  some 
  as 
  a 
  

   subgenus 
  only, 
  

   lleuter. 
  ) 
  

  

  I 
  Caecum 
  annulatum 
  Brown 
  ( 
  ringed. 
  ) 
  

   i 
  Caecum 
  auriculatum 
  De 
  Folin 
  (Lat 
  .auriculai 
  

  

  auricula 
  te.) 
  I 
  

  

  De 
  Folin 
  (divided 
  into 
  j 
  

  

  ear, 
  ear 
  lobe; 
  

  

  j 
  Caecum- 
  bipartitum 
  

   tv;o 
  parts.l 
  

  

  pa 
  

   Caecum 
  

  

  North 
  

   Caecum 
  

  

  carolinia 
  num 
  

   Carolina.!" 
  

  

  Dall 
  (Carolina; 
  •ff 
  

  

  I 
  

  

  c 
  ayo 
  sense 
  Rehder 
  (from 
  the 
  Florida 
  

  

  "Keys; 
  Cayo 
  in 
  Spanish 
  stands 
  for 
  Key.) 
  

   Caecum 
  clarki 
  Carpenter 
  (Clark's.) 
  

  

  Caecum 
  cooper 
  i 
  S. 
  

  

  Smith 
  (Cooper's.) 
  

   Caecum'co 
  ron 
  e 
  Hum 
  Dall 
  (with 
  a 
  little 
  

   crown; 
  the 
  tube 
  is 
  suddenly 
  enlarged, 
  

   forming 
  a 
  stout 
  ring 
  around 
  the 
  aperture]) 
  

   C 
  aecim 
  decussatum 
  De 
  Folin 
  (decussated; 
  j 
  

   X 
  shaped; 
  intersected 
  by 
  crossed 
  lines.)! 
  

   Caecum 
  fl 
  oridanum 
  Stimpson 
  (Florida; 
  oc- 
  

   curring 
  from 
  North 
  Carolina 
  to 
  Florida.) 
  

   Caecum 
  glabrum 
  Montagu 
  ( 
  smooth, 
  ) 
  

   Caecum 
  instructum 
  De 
  Folin 
  (arranged, 
  fur+ 
  

  

  nished. 
  ) 
  

   Caecum 
  n 
  e 
  bulosum 
  Rehder 
  (cloudy; 
  vinace- 
  

  

  ous 
  brown. 
  ) 
  

   Caecum 
  pulchel 
  lum 
  St 
  impson 
  (rather 
  hand- 
  

   some; 
  of 
  a 
  pale 
  yellowish-brown 
  color, 
  

   and 
  sculptured 
  with 
  about 
  twenty-five 
  

   j 
  strong 
  rounded 
  ribs 
  . 
  ) 
  

  

  I 
  Caecum 
  .lohnson 
  i 
  Winkley 
  ( 
  Johnson 
  ' 
  s 
  ; 
  named 
  

   i 
  for 
  Charles 
  ^f. 
  Johnson.) 
  

   Caecum 
  tortile 
  Dall 
  (twisted; 
  shell 
  

  

  curved 
  

  

  "slightly 
  tv/isted 
  so 
  that 
  it 
  is 
  

   two 
  directions.) 
  

  

  in 
  

  

  Meioceras 
  deshay 
  e 
  si 
  De 
  Folin 
  (named 
  for 
  

   Gerard 
  Paul 
  Deshayes, 
  a 
  French 
  concholo- 
  

   gist, 
  1796-1876.) 
  

  

  Meioceras 
  lermon 
  d 
  i 
  Dall 
  (named 
  for 
  Norman 
  

   ^y. 
  Lermond, 
  1861-1944.) 
  

  

  Meioceras 
  niti 
  dum 
  Stimpson 
  (shining.) 
  

  

  Meioceras 
  undulosum 
  De 
  Folin 
  (wavy.) 
  

  

  7, 
  Family 
  Planaxidae 
  . 
  (Lat. 
  planus, 
  flat 
  -t- 
  axis, 
  axis.) 
  

  

  Genu 
  s 
  Plana 
  xi 
  s 
  La 
  - 
  I 
  Planaxis_lineatus 
  Da 
  Costa 
  (lined; 
  with 
  

   marck__1822.rMasc. 
  ) 
  j 
  spiral 
  bands. 
  ) 
  

  

  i 
  Planaxis 
  nucleus 
  Brugui^re 
  (kernel 
  . 
  ) 
  

  

  1 
  8. 
  Family 
  Modulidae 
  . 
  (Lat. 
  modulus, 
  a 
  little 
  measure.) 
  

  

  Modulu 
  s 
  mo 
  dulu 
  s 
  Linne 
  (little 
  measure; 
  

   Modulus 
  florid 
  an"u3 
  C 
  onrad 
  (Florida) 
  is 
  

   Genus 
  M 
  od 
  ulus 
  Gray 
  the 
  same.T" 
  

   1842 
  . 
  {Masc. 
  ) 
  Modulus 
  c 
  archedonius 
  Lamarc 
  k 
  (sort 
  of 
  

  

  ruby. 
  Shell 
  is 
  grayish 
  ?;hite 
  with 
  spots 
  

   of 
  purplish 
  brown. 
  Formerly 
  known 
  as 
  

   { 
  Modulus 
  angula 
  tus 
  C. 
  B. 
  Adam 
  s 
  (angled, 
  

   ,_ 
  angulate.y 
  

  

  