﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  1069 
  

  

  broad 
  plications 
  most 
  conspicuous 
  at 
  the 
  margins. 
  Loop 
  proba- 
  

   bly 
  short, 
  with 
  slightly 
  recurved 
  ascending 
  lamellae 
  ; 
  jugal 
  pro- 
  

   cesses 
  not 
  united 
  above. 
  

  

  (It 
  has 
  been 
  shown 
  by 
  Douville 
  that 
  the 
  termTERBRATULA, 
  

   though 
  introduced 
  by 
  Llhwyd 
  in 
  1699, 
  can 
  

   only 
  derive 
  a 
  definite 
  significance 
  from 
  the 
  

   determinations 
  by 
  Klein 
  in 
  1753. 
  Klein's 
  

   first 
  species 
  is 
  T. 
  simplex, 
  which 
  is 
  the 
  same 
  

   as 
  the 
  Concha 
  anomia 
  of 
  Colonna 
  (1676) 
  

   and 
  the 
  last 
  author's 
  figure 
  which 
  is 
  repro- 
  

   duced 
  by 
  Klein, 
  and 
  also 
  inserted 
  here, 
  

   represents 
  one 
  of 
  the 
  extensive 
  group 
  of 
  the 
  

   TerebratulcB 
  biplicalce. 
  From 
  Linne's 
  de- 
  

   scription 
  of 
  his 
  Anomia 
  terebratula 
  (1758), 
  

  

  Which 
  is 
  also 
  based 
  Upon 
  this 
  Shell, 
  it 
  is 
  Fig. 
  529. 
  Terebratula 
  $im- 
  

  

  inf 
  erred 
  that 
  the 
  species 
  thereby 
  represented 
  v 
  lex 
  - 
  (Colonna, 
  klkik, 
  

  

  is 
  a 
  fossil 
  from 
  the 
  Mesozoic 
  or 
  Tertiary 
  

  

  formations, 
  though 
  its 
  geological 
  horizon 
  is 
  not 
  more 
  precisely 
  

  

  known.) 
  

  

  Liothyrina, 
  CEhlert. 
  1887. 
  

  

  Synonym 
  ; 
  Liothyris, 
  Douville, 
  1880. 
  

  

  Shells 
  biconvex, 
  unplicated. 
  Loop 
  short, 
  transverse 
  lamella 
  

   bent 
  upward 
  in 
  the 
  middle 
  ; 
  oral 
  process 
  discrete 
  ; 
  cardinal 
  

  

  Figs. 
  520, 
  531. 
  Liothyrina 
  vitrea, 
  Born 
  (sp.), 
  (Davidson.) 
  

  

  process 
  small, 
  hinge-plate 
  divided. 
  Muscular 
  scars 
  restricted 
  to 
  

   the 
  posterior 
  portion 
  of 
  both 
  valves. 
  

  

  Animal 
  with 
  long, 
  free 
  brachia 
  united 
  at 
  the 
  base 
  by 
  a 
  mem- 
  

   branous 
  expansion. 
  

  

  127 
  

  

  