﻿I 
  149 
  

  

  ' 
  (Lat. 
  mytilus, 
  a 
  sea-mussel.) 
  

  

  Family 
  Mytilida 
  e. 
  (Lat. 
  mytilus, 
  a 
  sea-mussel.) 
  

  

  a 
  ) 
  Gen 
  us 
  Idas 
  Jeffreys 
  

   187 
  6^ 
  Tltlas, 
  a 
  Greek 
  

   hero 
  who 
  killed 
  Cas- 
  

   tor 
  and 
  was 
  killed 
  

   by 
  Zeus, 
  Masc.) 
  

  

  ^ 
  ) 
  Genus 
  Crenella 
  Brow 
  n 
  

   1827. 
  (Diminutive 
  of 
  

   Lat, 
  crena, 
  a 
  notch. 
  

   The 
  inner 
  edge 
  of 
  

   the 
  shell 
  is 
  notched, 
  

   crenate, 
  regularly 
  

   indented. 
  Fern.) 
  

  

  c 
  ) 
  Genu 
  s 
  Da 
  crydium_Tqr- 
  

   e 
  1 
  1 
  _1 
  8 
  59 
  . 
  ( 
  D 
  i 
  m 
  i 
  nu 
  t 
  i 
  - 
  

   ve 
  of 
  Gr. 
  dacrj^s, 
  a 
  

   tear; 
  a 
  little 
  tear, 
  

   drop. 
  Neuter.) 
  

  

  d) 
  

  

  Idas 
  argenteus 
  Jeffreys 
  ( 
  s 
  i 
  1 
  ve 
  ry 
  . 
  ) 
  

  

  e) 
  

  

  Ge 
  nu 
  s 
  ^ 
  Mo 
  di 
  o 
  lus 
  La- 
  

   marck 
  1799 
  . 
  ~Xl 
  at. 
  a 
  

   small 
  measure, 
  a 
  

   drinking 
  vessel 
  .llasc.) 
  

   Formerly 
  known 
  as 
  

   Genus 
  V 
  ols 
  ella 
  Scopo- 
  

   li 
  17777rLat. 
  kind 
  of 
  

   pincers, 
  tweezers. 
  

   Fem.) 
  Volsella 
  has 
  

   now 
  been 
  officially 
  

   rejected 
  (Jan. 
  7, 
  1955). 
  

  

  (Lat, 
  crossec. 
  

   crossing 
  eacl:, 
  

  

  Crenella 
  decussata 
  Montagu 
  

  

  like 
  an 
  X; 
  the 
  striae 
  are 
  

  

  other 
  at 
  acute 
  angles.) 
  

   Crenella 
  divaricata 
  Orhigny 
  (Lat. 
  spread! 
  

  

  apart, 
  branching 
  off 
  at 
  obtuse 
  angles; 
  \ 
  

  

  obliquely 
  striated.) 
  i 
  

  

  Cre 
  nella 
  faba 
  Miiller 
  (Lat. 
  faba, 
  a 
  kind] 
  

  

  of 
  bean;resembling 
  a 
  bean; 
  oval-oblong^| 
  

  

  QZ£Ii6ii§i_£l§:£ili^_X£Iliil 
  (fragile.) 
  i 
  

   Crene 
  lla 
  glandul 
  a 
  To 
  tten 
  (gland, 
  tonsil,] 
  

  

  small 
  acorn. 
  Shell 
  oval, 
  rounded 
  and 
  | 
  

  

  swollen. 
  ) 
  ': 
  

  

  Crenell 
  a 
  pectinu 
  la 
  Gould 
  (diminutive 
  of 
  

  

  p'ecten, 
  a 
  little 
  comb; 
  recalling 
  a 
  

  

  Pecten 
  by 
  its 
  form.) 
  

  

  Dacrydium 
  vitreum 
  Moller 
  (vitreous, 
  

   glassy, 
  transparent.) 
  

  

  Modiolus 
  m 
  odiolus 
  Linne 
  (Lat. 
  noun 
  mean^ 
  

   ing 
  a 
  small 
  measure, 
  a 
  kind 
  of 
  drink- 
  

   ing 
  vessel. 
  ) 
  

  

  Modi 
  olus 
  ame 
  rica 
  nus 
  Le 
  ach 
  ( 
  Ame 
  r 
  i 
  c 
  an 
  . 
  ) 
  

   Formerly 
  listed 
  as 
  Modiolus 
  tul 
  ipa 
  or 
  

   tuligus 
  Linne 
  (a 
  tulip; 
  yellowish 
  or 
  

   brcwn 
  with 
  dark 
  purplish 
  inside.) 
  

  

  Modiolus 
  dem 
  issu 
  s 
  Sillw 
  yn 
  ( 
  humb 
  1 
  e 
  , 
  

  

  imbedded 
  

  

  m 
  

  

  low; 
  

   the 
  

  

  lives 
  among 
  stones 
  or 
  

   soil 
  in 
  polluted 
  waters.) 
  

  

  M° 
  diolus 
  demissus 
  plicatul 
  us 
  Lairi 
  a 
  rck 
  

   fplaited, 
  ribbed; 
  ornamented 
  with 
  many 
  

   radiating 
  ribs.) 
  This 
  shell 
  is 
  the 
  

   same 
  as 
  Modiolus 
  demissus 
  Dillr/yn. 
  

  

  Modiolus 
  demissus 
  granosis 
  simus 
  Sowerby 
  

  

  G 
  enus 
  B 
  rach 
  idon 
  t 
  e 
  s 
  

   Sv/a 
  in 
  son 
  18 
  40. 
  "TGr 
  . 
  

   brachys, 
  short 
  i- 
  

   odous, 
  odont-, 
  tooth. 
  

   Near 
  ligament 
  are 
  a- 
  

   bout 
  thirty 
  tiny 
  teeth. 
  

   Brachj^dontes 
  is 
  a 
  mis- 
  

   spelling. 
  Masc.) 
  

  

  Tvery 
  granulated; 
  ribs 
  cut 
  transverse- 
  

   ly 
  into 
  granules.) 
  

  

  Brachido 
  ntes 
  citrin 
  us 
  Roding 
  (Latin 
  

   citrus, 
  citron 
  tree; 
  like 
  a 
  lemon. 
  

   Periostracum 
  is 
  yellow, 
  sometimes 
  tin- 
  

   ged 
  with 
  green. 
  ) 
  

  

  Brachidont 
  es 
  exu 
  stus 
  Linne 
  ( 
  scorched, 
  

   burned; 
  black 
  brown 
  or 
  red 
  inside 
  and 
  

   out.) 
  

  

  Brachidontes 
  re 
  curvus 
  Ra 
  f 
  inesque 
  (bent; 
  

   it 
  is 
  strongly 
  curved. 
  ) 
  

  

  