﻿144 
  

   Yoldia 
  thraciaeformis 
  

  

  Storer 
  ( 
  shaped 
  li- 
  

  

  si 
  railis 
  Ver 
  rill 
  & 
  Bush 
  (differ-j 
  

   species 
  "differs 
  considerahly 
  j 
  

  

  ke 
  a 
  Thracia, 
  "broad 
  and 
  squarish.) 
  . 
  

  

  Yoldia 
  curta 
  Verril 
  l 
  & 
  Bush 
  ( 
  short 
  5 
  shell 
  

   is 
  short, 
  ) 
  

  

  Yold 
  ia 
  diss 
  

  

  ent; 
  this 
  species 
  "differs 
  considerahly 
  

   froin 
  the 
  typical 
  forms 
  of 
  Yoldiella", 
  

   write 
  Verrill 
  and 
  Bush.) 
  

  

  Yoldia 
  expansa 
  J 
  effreys 
  (spread 
  out, 
  ex- 
  

   panded, 
  swollen. 
  ) 
  

  

  Yoldia 
  fraterna 
  Verrill 
  & 
  Bush 
  ( 
  frater- 
  

   nal, 
  hrotherly; 
  closely 
  allied 
  to 
  ano- 
  

   ther 
  species. 
  ) 
  

  

  Yoldia 
  fri 
  gid 
  a 
  Torell 
  (cold, 
  frigid; 
  

   found 
  from 
  Gulf 
  of 
  St. 
  Lawrence 
  to 
  

   Massachusetts. 
  ) 
  

  

  Yoldia 
  inconspicua 
  Verrill 
  & 
  Bush 
  (not 
  

   conspicuous, 
  not 
  remarkable; 
  shell 
  is 
  

   small, 
  thin, 
  delicate.) 
  

  

  Yoldia 
  inflata 
  V 
  errill 
  & 
  Bush 
  ( 
  s\'v 
  o 
  1 
  1 
  e 
  n 
  ; 
  

   shell 
  small, 
  swollen, 
  rather 
  short.) 
  

  

  Yoldia 
  iris 
  Verrill 
  & 
  Bush 
  (iris, 
  the 
  

  

  c) 
  

  

  G 
  enus 
  Yol 
  d 
  ia 
  Mo 
  l 
  ie 
  r 
  

   1842. 
  (J'^amed 
  for 
  

  

  rainbow; 
  shell 
  brilliantly 
  iridescent, 
  

   covered 
  with 
  fine 
  concentric 
  lines.) 
  

   Yoldia 
  i 
  ris 
  s 
  tricta 
  V 
  er 
  rill 
  & 
  Bush 
  (Lat 
  

   strictus: 
  narrow, 
  squeezed, 
  tight.) 
  

  

  Count 
  Yoldi 
  of 
  Den- 
  Yoldia 
  jef 
  fre 
  ysi 
  Hidalgo 
  (Jeffreys'; 
  na- 
  

  

  mark, 
  3?em. 
  ) 
  

  

  med 
  for 
  John 
  G. 
  Jeffreys, 
  

   acologist, 
  1809-1385.) 
  

   Yoldia 
  lenticula 
  amblia 
  Verrill 
  

  

  a 
  British 
  mal- 
  

  

  & 
  Bush 
  

  

  d) 
  

  

  Genus 
  Microyoldi 
  a 
  

   Verr 
  il 
  l 
  & 
  Bush 
  18 
  97 
  

   ( 
  Gr, 
  micros, 
  small 
  

   -I- 
  Yoldia. 
  A 
  small 
  

   Yoldia. 
  Fem, 
  ) 
  

  

  e 
  ) 
  G 
  enus 
  Pristigloma 
  r 
  

  

  (lenticula, 
  lentil; 
  amblia, 
  Gr. 
  axnblys, 
  

   fern, 
  ambleia, 
  blunt, 
  dulled, 
  having 
  lost 
  

   its 
  point.) 
  

   I 
  Yoldi 
  a 
  lucida 
  Loven 
  (shining, 
  bright; 
  

   shell 
  iridescent; 
  periostracum 
  has 
  bril- 
  

   liant 
  colors 
  . 
  ) 
  

  

  Yoldia 
  m 
  inuscula 
  Verrill 
  & 
  Bu 
  sh 
  (rather 
  

   small; 
  shell 
  minute. 
  j 
  

  

  Yoldia 
  pa 
  chia 
  Ver 
  r 
  ill 
  & 
  Bush 
  (Gr, 
  pachys, 
  

   fern, 
  pacheia, 
  thick, 
  stout; 
  shell 
  is 
  

   very 
  broad, 
  considerably 
  swollen 
  in 
  the 
  

   middle 
  . 
  ) 
  

  

  Yoldia 
  pygm 
  e 
  a 
  Tliinster 
  (pygmean, 
  dwarf.) 
  

  

  Yoldia 
  se 
  ri 
  cea 
  stri 
  ol 
  ata 
  Jeffr 
  eys 
  (seri- 
  

   ceus, 
  silken, 
  of 
  silk; 
  striolatus, 
  mark- 
  

   ed 
  with 
  striae 
  or 
  fine 
  grooves.) 
  

  

  Yoldia 
  subangula 
  ta 
  Verrill_&_3ush 
  ( 
  some- 
  

   what 
  angulate, 
  pointedTl 
  

  

  Yoldia 
  subaequilatera 
  Jeffreys 
  ( 
  somewhat 
  

   [ 
  equilateral; 
  both 
  ends 
  are 
  nearly 
  equal 
  

   in 
  length.) 
  

  

  Microyoldia 
  re 
  g 
  ularis 
  Verril 
  l 
  (regular.) 
  

  

  