﻿the 
  right 
  valve 
  and 
  

   the 
  umbones 
  turn 
  

   from 
  left 
  to 
  right, 
  

   Eem. 
  ) 
  

  

  c) 
  Genus 
  Echinochama 
  P 
  . 
  

   Fischer 
  1887. 
  (Gr. 
  e- 
  

   chinos, 
  hedgehog 
  h- 
  

   chama, 
  gaping 
  cockle. 
  

   Radial 
  ribs 
  with 
  spi- 
  

   nes. 
  Spiny 
  Charna.Fem.) 
  

  

  164 
  

   ried; 
  scar 
  is 
  narrower 
  and 
  longer 
  than 
  

   in 
  P. 
  radians 
  Lamarck 
  5 
  its 
  width 
  half 
  

   the 
  length 
  or 
  less.) 
  

  

  Echinocliama 
  arcinella 
  Linne 
  

  

  _ 
  (a 
  diminutive 
  

   an 
  ark 
  5 
  is 
  fromj 
  

  

  of 
  area, 
  a 
  little 
  chest, 
  

   the 
  West 
  Indies 
  to 
  South 
  America.) 
  :■ 
  

   Echinochama 
  c 
  ornut 
  a 
  Co 
  nrad 
  (with 
  horns; 
  1 
  

   it 
  has 
  shorter 
  spines 
  than 
  arcinella 
  L.) 
  

  

  V. 
  SUPEREMILY 
  LEPTONACEA 
  

  

  (Gr. 
  leptos, 
  small, 
  fine, 
  delicate; 
  lepton, 
  a 
  small 
  coin.) 
  

   Family 
  L 
  e 
  pt 
  onidae. 
  (Same 
  etymology 
  as 
  above.) 
  

  

  a) 
  Genus 
  Eryc 
  in 
  a 
  La 
  - 
  

   m 
  arck 
  ISOS 
  TTs 
  ry 
  c 
  i 
  na 
  , 
  

   the 
  goddess 
  of 
  Eryx, 
  

   a 
  mountain 
  of 
  Sicily 
  

   having 
  on 
  its 
  summit 
  

   a 
  temple 
  of 
  Venus; 
  

   hence 
  appellation 
  of 
  

   Venus, 
  Fem. 
  ) 
  

  

  b 
  ) 
  Genus 
  Bornia 
  Philippi 
  

   1856. 
  (Named 
  for 
  

   Born, 
  a 
  naturalist. 
  

   Fem. 
  ) 
  

  

  c 
  ) 
  Genus 
  Tellim^/a 
  Brown 
  

   1827. 
  (The 
  first 
  syl- 
  

   lables 
  of 
  Tellina 
  -•- 
  

   mya, 
  a 
  sea-mussel, 
  a 
  

   Mya 
  . 
  ) 
  ( 
  Formerly 
  known 
  

   as 
  Chi 
  ro 
  nia 
  Deshayes 
  

   1839. 
  (Gr. 
  Cheiron, 
  

   Chiron, 
  one 
  of 
  the 
  

   Centaurs. 
  Fem. 
  ) 
  

  

  d 
  ) 
  Genus 
  Kellia 
  Turton 
  

   1822 
  . 
  (Named 
  for 
  J. 
  

   0' 
  Kelly 
  of 
  Dublin. 
  

   Fem, 
  ) 
  

  

  ^ 
  ) 
  Gen 
  us 
  Lepton 
  Turton 
  

   1822 
  . 
  ( 
  A 
  small 
  coin. 
  

   Ileuter. 
  ) 
  

  

  Erycina 
  emmonsi 
  Pall 
  (Emmons' 
  . 
  ) 
  

  

  Erycina 
  fernandina 
  Pal 
  l 
  (off 
  Fernandina, 
  

  

  Florida. 
  ) 
  

   Erycina 
  line 
  11a 
  Pall 
  (a 
  little 
  line, 
  

  

  string. 
  ) 
  

   Erycina 
  periscopiana 
  Pal 
  l 
  (Gr. 
  peri, 
  a- 
  

  

  round 
  1- 
  scopein, 
  to 
  view; 
  to 
  watch 
  a- 
  

   } 
  round; 
  found 
  off 
  Cape 
  Lookout 
  , 
  N. 
  Carote. 
  

  

  Bornia 
  longipes 
  Stimpson 
  (long 
  foot.) 
  

  

  Tellimya 
  suborbicular 
  is 
  goul 
  di 
  Thomson 
  

   ( 
  suborbicular; 
  named 
  for 
  Dr. 
  Augustus 
  A, 
  

   Gould, 
  a 
  distinguished 
  American 
  natura- 
  

   list, 
  1805-1866.) 
  

  

  Kell 
  ia 
  rubra 
  M 
  ontagu 
  (red; 
  periostracum 
  

   varies 
  from 
  greenish 
  to 
  red.) 
  

  

  L 
  

  

  Lepton 
  lepidum 
  Say 
  (Lat. 
  graceful, 
  charm- 
  

   ingT) 
  

  

  ^) 
  Genus 
  IJysella 
  An 
  gas 
  iMys 
  ella 
  casta 
  Verrill 
  & 
  Bus 
  h 
  (pure.) 
  

  

  1877. 
  (A 
  little 
  mus- 
  

   sel.) 
  Also 
  known 
  as 
  

   Genus, 
  Rochefortia 
  

   Velain 
  1877. 
  (Name 
  d 
  

   for 
  Rochefort, 
  a 
  

   French 
  naturalist.) 
  

   Fem. 
  ) 
  

  

  j 
  tHysella 
  m.oll 
  e 
  ri 
  Morc 
  h 
  (Moller's; 
  mmed 
  

   I 
  in 
  honor 
  of 
  Moller, 
  a 
  naturalist.) 
  

   Myse 
  lla 
  ovata 
  Jeffrey 
  s 
  ( 
  ovate 
  , 
  egg- 
  shaped^ 
  

   Uiysella 
  planulata 
  Stimpson 
  (plane; 
  flat, 
  

   t 
  compressed. 
  ) 
  

  

  i 
  Mysella 
  planulat 
  a 
  ten 
  uis 
  V 
  er 
  r 
  ill 
  & 
  Bush 
  

   ! 
  ( 
  thin, 
  delicate 
  77 
  

  

  