﻿i 
  ) 
  Genus 
  Cerastoderma 
  

   Po 
  ll 
  1 
  795. 
  (Gr 
  e 
  e 
  k 
  

   cerastes, 
  horny 
  -i- 
  

   derma, 
  skin. 
  Neuter.) 
  

  

  167 
  

   J 
  Gerastoderma 
  elegantulum 
  Beck 
  (rather 
  e- 
  j 
  

   j 
  legantTl 
  I 
  

  

  I 
  Cerastod 
  er 
  ma 
  pinnu 
  l 
  atum 
  Conrad 
  (Lat. 
  pin-j 
  

   : 
  nula, 
  a 
  little 
  feather; 
  having 
  a 
  plume- 
  

   ; 
  like 
  appearance; 
  each 
  rib 
  possesses 
  a 
  

   I 
  series 
  of 
  equidistant 
  slightly 
  arched 
  

   scales.) 
  

  

  VII. 
  SUPER?AI'IILY 
  VEI-IERACSA 
  

   (Named 
  after 
  "Venus, 
  Veneris, 
  the 
  goddess 
  of 
  love.) 
  

   1, 
  Family 
  Veneridae 
  . 
  (Same 
  etymology 
  as 
  ahove.) 
  

  

  a 
  ) 
  Genus 
  Antigo 
  n 
  a 
  Schu- 
  

   mach 
  er 
  1817 
  . 
  "Tprom 
  

   Antigone, 
  a 
  daughter 
  

   of 
  OEdipus; 
  also 
  a 
  

   daughter 
  of 
  Laomedon, 
  

   Fern. 
  ) 
  

  

  b 
  ) 
  Genus 
  Mercena 
  ria 
  

   Sc 
  humacher 
  1817 
  . 
  

   ^at 
  , 
  me 
  r 
  c 
  ena 
  ry 
  ; 
  

   was 
  used 
  in 
  trading) 
  

   Formerly 
  called 
  Ge- 
  

   '^^ 
  s 
  Venus 
  Linne 
  1 
  758. 
  

   Earned 
  after 
  Venus, 
  

   the 
  goddess 
  of 
  love.) 
  

   (Fern.) 
  

  

  c 
  ) 
  Genus 
  Chi 
  one 
  Miihl 
  - 
  

   feld 
  1811. 
  (Chi 
  one 
  , 
  

   daughter 
  of 
  Boreas 
  

  

  rigid; 
  

   it 
  is 
  

  

  ;sur- 
  

  

  Antigona 
  li 
  s 
  teri 
  Gray 
  (Lister's; 
  named 
  

   for 
  Martin 
  Lister, 
  an 
  English 
  naturalist 
  

   and 
  physician, 
  about 
  1638-1712) 
  . 
  

   A 
  ntigona 
  c 
  allimorpha 
  Pal 
  l 
  (of 
  a 
  beautiful 
  

   shape; 
  beautifully 
  shaped.) 
  

  

  Antig 
  o 
  na 
  rigida 
  Dillwy 
  n 
  (stiff, 
  

   v/ith 
  strong 
  concentric 
  ridges; 
  

   from 
  the 
  West 
  Indies.) 
  

  

  ' 
  Antigona 
  rugatina 
  Heilpri 
  n 
  ( 
  wrinkled 
  , 
  

  

  I 
  face 
  covered 
  with 
  peculiar 
  lamellar 
  

  

  ! 
  ridges.) 
  

  

  ' 
  Antigona 
  strigillina 
  Pal 
  l 
  (somewhat 
  scul- 
  

  

  '_ 
  ptured 
  like 
  a 
  Strigilla.) 
  

  

  Mercenaria 
  carnp 
  echi 
  ensis 
  Gmelin 
  (Campeche: 
  

   found 
  in 
  Yucatan, 
  Texas 
  and 
  from 
  Balti- 
  

   more 
  to 
  Cuba. 
  ) 
  

  

  Merc 
  e 
  naria 
  ca 
  rnpechiensis 
  alboradiata 
  So 
  - 
  

   werby 
  (Lat. 
  albus, 
  white 
  -i- 
  radiatus, 
  

   rayed; 
  it 
  has 
  brown 
  rays 
  on 
  a 
  paler 
  

   ground. 
  ) 
  

  

  Mercenaria 
  carnp 
  e 
  chiensis 
  subcajnpechiensis 
  

  

  Palme 
  r 
  ( 
  somewhat 
  carnpechiensis 
  . 
  ) 
  

   Mercenaria 
  mercenar 
  i 
  a 
  Linne 
  ( 
  me 
  r 
  ce 
  nary 
  ; 
  

  

  used 
  in 
  trade. 
  ) 
  

   Mercenaria 
  mercenaria 
  texana 
  Pall 
  (from 
  

  

  Texas. 
  ) 
  

   Merc 
  enaria 
  mercena 
  r 
  ia 
  alba 
  Pall 
  ( 
  whi 
  te 
  . 
  ) 
  

   Me 
  rcenaria 
  mercenaria 
  notata 
  Say 
  (marked, 
  

  

  branded; 
  shows 
  zigzag 
  purplish 
  brown 
  

  

  blotches 
  and 
  lines.) 
  

   Me 
  rcenaria 
  mercenaria 
  subradiat 
  a 
  Palmer 
  

   "fsomewhat 
  rayed.) 
  

  

  Chione 
  canc 
  ellat 
  a 
  Linne 
  ( 
  t 
  re 
  His- 
  like, 
  

  

  cross-barred; 
  sculptured 
  with 
  concentric 
  

  

  ridges 
  and 
  radiating 
  ribs.) 
  

   Chi 
  one 
  intapur 
  p 
  urea 
  Conrad 
  (Lat. 
  intra 
  or 
  

  

  intus, 
  inside'"-!- 
  purpura, 
  purple; 
  part 
  

  

  of 
  the 
  interior 
  is 
  purplish.) 
  

   Chione 
  mazycki 
  P 
  all 
  (Mazyck's; 
  named 
  for 
  

  

  V/illiam 
  G. 
  Mazyck, 
  an 
  American 
  concholo- 
  

  

  gist, 
  1846-1942.) 
  

   Chione 
  puber 
  Valenciennes 
  ( 
  adult 
  ; 
  pub 
  era 
  

  

  is 
  not 
  correct 
  Latin.) 
  

  

  