﻿b 
  ) 
  Genus 
  Atrina 
  Gray 
  

   1842. 
  (Lat 
  . 
  ater, 
  

   atra, 
  black-colored. 
  

   Shell 
  brown 
  to 
  brownr- 
  

   ish 
  black 
  in 
  color. 
  

   Not 
  unlike 
  the 
  old 
  

   quill 
  pen 
  in 
  appear- 
  

   ance, 
  Fern.) 
  

  

  152 
  

  

  A 
  trina 
  ri(;;ida 
  Sol 
  a 
  nder 
  (stiff) 
  

   I 
  Atrina 
  s 
  er 
  rata 
  Sov^ferby 
  (saw-toothed; 
  

   many 
  sharp 
  spines,) 
  

  

  wit] 
  

  

  III. 
  S 
  UPERFAIvIILY 
  PECTIITAGSA 
  

   (Lat, 
  pecten, 
  pectinis, 
  a 
  comb; 
  also 
  a 
  seashell, 
  a 
  scallop.) 
  

  

  1, 
  Fainily 
  D 
  imyidae 
  . 
  (Gr. 
  dis, 
  twice 
  ->- 
  myein, 
  to 
  close; 
  shells 
  having 
  

  

  two 
  separate 
  lateral 
  muscular 
  impressions,) 
  

  

  Genus 
  Dimya 
  Rouault 
  j 
  Dimya 
  arpientea 
  Dall 
  ( 
  s 
  ilve 
  ry 
  , 
  ) 
  

   1843. 
  (Fem.) 
  

  

  2, 
  Parflily 
  P 
  licatulidae 
  . 
  (Lat, 
  plicatus, 
  folded, 
  plaited. 
  With 
  radial 
  

  

  ribs.yCCorriTiion 
  name: 
  Plait 
  Shells) 
  

  

  Genus 
  Plicatula 
  La- 
  i 
  Plicatula 
  p;ibbosa 
  Lamarck 
  (humped; 
  Its 
  

   marck 
  IBOlTIPlaited, 
  ! 
  surface 
  is 
  sculptured 
  with 
  strong 
  radia-| 
  

   Fern.) 
  i 
  ting 
  ribs,) 
  j 
  

  

  • 
  Plicatul 
  a 
  spondyloidea 
  Meuschen 
  ( 
  shaped 
  I 
  

   • 
  I'ike 
  a 
  Spondyl'us, 
  ) 
  ' 
  

  

  3, 
  Family 
  Pectinidae 
  . 
  (Lat, 
  pecten, 
  pectinis, 
  a 
  comb; 
  also 
  a 
  scallop, 
  j 
  

  

  Common 
  name: 
  Scallop 
  Shells.) 
  j 
  

  

  i 
  

   i 
  Pecten 
  raveneli 
  Dal 
  l 
  (Ravenel's; 
  named 
  j 
  

   for 
  Edmund 
  Ravenel, 
  an 
  7\merican 
  concho- 
  j 
  

   legist.) 
  

   Pecten 
  tereinus 
  Dall 
  (Gr. 
  teren, 
  fern, 
  

   tereina, 
  smooth, 
  soft, 
  delicate. 
  Shell 
  

   fragile, 
  thin. 
  Color 
  delicate,) 
  

   Pecten 
  zicza 
  c 
  Linne 
  (zigzag; 
  it 
  has 
  zig- 
  

   ' 
  zag 
  lines 
  on 
  flat 
  valve.) 
  

   Pecten 
  glyptus 
  Verrill 
  (Gr, 
  carved, 
  scul- 
  

  

  ptured. 
  ) 
  

   Pecten 
  acanthodes 
  Dall 
  (Gr, 
  thorny, 
  spi- 
  

  

  a) 
  Genu 
  s 
  Pe 
  cte 
  n 
  K 
  iiller 
  

   17767lMasc,T~ 
  

  

  ny. 
  Ribs 
  are 
  spiny,; 
  

   Pecten 
  heliacus 
  pall_( 
  of 
  the 
  sun, 
  belong- 
  

  

  is 
  mottled 
  and 
  zoned 
  

   upon 
  a 
  white 
  sur- 
  

  

  ing 
  to 
  the 
  sun; 
  it 
  

   with 
  pink 
  or 
  crimson 
  

   face. 
  ) 
  

  

  Pecten 
  gibbus 
  Linne 
  (humped; 
  the 
  shell 
  is 
  

   inflated.) 
  

  

  Pecten 
  irradians 
  Lamarck 
  (radiating; 
  cov- 
  

   ered 
  with 
  radiating 
  ribs.) 
  

  

  Pecten 
  irradians 
  amplicostatus 
  Dall 
  (mnyi 
  

  

  to 
  15 
  strong 
  ribs.) 
  

   concentricus 
  Say 
  (con- 
  

  

  ribbed';; 
  has 
  12 
  

  

  Pecten 
  i 
  rradians 
  

  

  ! 
  centric; 
  more 
  solid 
  than 
  P. 
  irradians 
  Lam-ji 
  

   i 
  Pecten 
  gibbus 
  nucleu 
  s 
  Born 
  (gibbus: 
  hump- 
  

   j 
  ed; 
  nucleus: 
  a 
  pit, 
  kernel, 
  llut 
  Scallop.! 
  

   i 
  it 
  is 
  thin 
  and 
  small.) 
  I 
  

  

  " 
  Pecten 
  lineolaris 
  Lamarck 
  (with 
  thin 
  lines) 
  

  

  