﻿131 
  

   2. 
  Family 
  Mopaliidae 
  . 
  (From 
  Mopalia, 
  an 
  arbitrary 
  name 
  invented 
  by- 
  

   Gray 
  merely 
  for 
  its 
  pleasing 
  combination 
  of 
  syllables.) 
  

  

  a) 
  Genus 
  Symmetrogep 
  hy- 
  

   rus 
  Midd 
  endorf 
  184 
  7 
  . 
  

   {"Gr. 
  symmetros, 
  sym- 
  

   metric 
  -I- 
  gephyra, 
  a 
  

   bridge. 
  MascOll'or- 
  

   merly 
  known 
  as 
  G 
  enus 
  

   Amicula 
  Gray 
  1847 
  , 
  

   Lat. 
  a 
  little 
  girl 
  

   friend, 
  which 
  was 
  

   then 
  feminine.) 
  

  

  Symmetr 
  o 
  gephyrus 
  vestitus 
  Broderip 
  and 
  

   S 
  ov/erby 
  (Lat. 
  dressed 
  withj 
  covered 
  

  

  with 
  a 
  brown 
  girdle 
  which 
  

   tered 
  tufts 
  of 
  hair.) 
  

  

  may 
  have 
  scat- 
  

  

  b) 
  Genus 
  

  

  1882. 
  

  

  Geratozona 
  

   TGr. 
  

  

  Dall^ 
  ' 
  

  

  ceras, 
  

   cerat-, 
  horn 
  -t- 
  zona,! 
  Geratozona 
  rugosa 
  Sowerby 
  (rough, 
  wrink- 
  

   a 
  girdle. 
  Girdle 
  is 
  } 
  led; 
  with 
  a 
  rough 
  sculpture 
  of 
  wavy 
  

   tough 
  with 
  hornlike 
  I 
  wrinkles.) 
  

   spines, 
  Pern.) 
  I 
  

  

  c) 
  

  

  Genus 
  Placiphorella 
  

   Carpenter) 
  Pall 
  1878L 
  

  

  w 
  

  

  A 
  diminutive 
  of 
  Pla- 
  

   c 
  iphora 
  . 
  From 
  Greek 
  

   placs, 
  plac-, 
  a 
  plate 
  

   -I- 
  phero, 
  carry. 
  Fem.l 
  

  

  Placiphorella 
  atlantica 
  Verrill 
  & 
  Smith 
  

   (Atlantic; 
  off 
  the 
  Georges 
  Bank.l 
  

  

  1 
  3, 
  

  

  Fami 
  ly 
  Crypto 
  p 
  lacidae 
  . 
  (Gr. 
  cryptos, 
  hidden 
  -•- 
  placs, 
  plac-, 
  a 
  

   plate. 
  Plates 
  sunken 
  in 
  the 
  back 
  of 
  the 
  mantle.) 
  

  

  a) 
  Genus 
  Cryptoconchus 
  

   Burro 
  w 
  1815 
  . 
  Tcr. 
  

   cryptos, 
  hidden 
  -i- 
  

   concha, 
  a 
  conch. 
  For- 
  

   merly 
  known 
  as 
  Genus 
  

   Acanthochites 
  Risso 
  

   1826. 
  Masc.) 
  

  

  b 
  ) 
  Genus 
  Acan 
  th 
  ochitona 
  

   Gray 
  1821 
  . 
  "[Gr 
  . 
  acan- 
  

   tha, 
  a 
  spine, 
  thorn 
  

   -I- 
  chiton, 
  a 
  tunic, 
  

   gown. 
  Formerly 
  known 
  

   as 
  G 
  enus 
  Acanthoch 
  i- 
  

   tes 
  Risso 
  1826 
  : 
  s 
  ame 
  

   etymology. 
  Fem.) 
  

  

  Cryptoconchus 
  floridanus 
  Pall 
  (found 
  in 
  

  

  Florida. 
  ) 
  

   Crypto 
  conchus 
  hemphilli 
  Pilsbry 
  ( 
  Hemphi 
  11"^ 
  

  

  named 
  for 
  Henry 
  Hemphill, 
  a 
  concholo- 
  

  

  gist.) 
  

  

  Acanthochitona 
  balesae 
  P 
  ilsbry 
  ( 
  named 
  

   for 
  Mrs. 
  Blenn 
  R, 
  Bales 
  of 
  Circleville, 
  

   Ohio. 
  ) 
  

  

  Acanthochitona 
  pyg 
  maea 
  Pilsbry 
  (pygmean, 
  

   dwarf; 
  only 
  1/2 
  to 
  3/4 
  inch 
  in 
  length.) 
  

  

  Acan 
  thoch 
  itona 
  spiculosa 
  Reeve 
  (Lat. 
  

   spiculus, 
  pointed; 
  furnished 
  with 
  tufts 
  

   of 
  spicules, 
  of 
  sharp 
  points.) 
  

  

  Acan 
  thochitona 
  spiculosa 
  astrige 
  ra 
  Reeve 
  

  

  ("Lat. 
  astriger, 
  starry. 
  Valves 
  

   ly 
  colored, 
  often 
  with 
  wide 
  whi 
  

   stripes. 
  Is 
  the 
  same 
  species 
  as 
  

   ceding 
  one.) 
  

  

  various- 
  

   te 
  

   the 
  pre 
  

  

  Family 
  Ischnochitonidae 
  . 
  (Gr, 
  ischnos, 
  slender, 
  thin 
  -i- 
  chiton, 
  a 
  

   tunic, 
  gown. 
  Valves 
  are 
  thin. 
  Slender 
  Chitons.) 
  

  

  a) 
  Genus 
  Cal 
  l 
  oplax 
  Thie- 
  

   le 
  1909 
  . 
  TGr. 
  calos, 
  

   beautiful 
  -(- 
  plax, 
  a 
  

  

  Callo 
  plax 
  .ianeirensis 
  Gray 
  ( 
  de 
  Janeiro; 
  

   Range 
  from 
  Florida 
  to 
  Rio 
  de 
  Janeii'O, 
  

   Brazil. 
  ) 
  

  

  